| Schedule of Stockholders Equity [Table Text Block] | 
    
|   | 
  | 
  Bio-Techne Shareholders   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  Accumulated   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  Additional   | 
  | 
  | 
  | 
  | 
  | 
  | 
  Other   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Common Stock   | 
  | 
  | 
  Paid-in   | 
  | 
  | 
  Retained   | 
  | 
  | 
  Comprehensive   | 
  | 
  | 
  Noncontrolling   | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Shares   | 
  | 
  | 
  Amount   | 
  | 
  | 
  Capital   | 
  | 
  | 
  Earnings   | 
  | 
  | 
  Income(Loss)   | 
  | 
  | 
  Interest   | 
  | 
  | 
  Total   | 
  | 
 
|   Balances at June 30, 2020   | 
  | 
  | 
38,453 | 
  | 
  | 
$ | 
385 | 
  | 
  | 
$ | 
420,536 | 
  | 
  | 
$ | 
1,057,470 | 
  | 
  | 
$ | 
(97,199 | 
  )   | 
  | 
$ | 
- | 
  | 
  | 
$ | 
1,381,192 | 
  | 
 
|   Cumulative effect adjustments due to adoption of new accounting standards   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(276 | 
  )   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(276 | 
  )   | 
 
|   Net earnings   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
33,395 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
33,395 | 
  | 
 
|   Other comprehensive income   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
14,057 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
14,057 | 
  | 
 
|   Common stock issued for exercise of options   | 
  | 
  | 
117 | 
  | 
  | 
  | 
1 | 
  | 
  | 
  | 
13,727 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
13,728 | 
  | 
 
|   Common stock issued for restricted stock awards   | 
  | 
  | 
25 | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
(0 | 
  )   | 
  | 
  | 
(4,890 | 
  )   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(4,890 | 
  )   | 
 
|   Cash dividends   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,336 | 
  )   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,336 | 
  )   | 
 
|   Stock-based compensation expense   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
12,667 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
12,667 | 
  | 
 
|   Common stock issued to employee stock purchase plan   | 
  | 
  | 
6 | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
1,463 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
1,463 | 
  | 
 
|   Employee stock purchase plan expense   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
286 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
286 | 
  | 
 
|   Balances at September 30, 2020   | 
  | 
  | 
38,601 | 
  | 
  | 
$ | 
386 | 
  | 
  | 
$ | 
448,679 | 
  | 
  | 
$ | 
1,073,362 | 
  | 
  | 
$ | 
(83,142 | 
  )   | 
  | 
$ | 
- | 
  | 
  | 
$ | 
1,439,285 | 
  | 
 
|   Non-controlling interest in Eminence   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
8,985 | 
  | 
  | 
  | 
8,985 | 
  | 
 
|   Net earnings   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
46,274 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(130 | 
  )   | 
  | 
  | 
46,144 | 
  | 
 
|   Other comprehensive income   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
18,904 | 
  | 
  | 
  | 
83 | 
  | 
  | 
  | 
18,987 | 
  | 
 
|   Common stock issued for exercise of options   | 
  | 
  | 
161 | 
  | 
  | 
  | 
2 | 
  | 
  | 
  | 
16,748 | 
  | 
  | 
  | 
(2,482 | 
  )   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
14,268 | 
  | 
 
|   Common stock issued for restricted stock awards   | 
  | 
  | 
3 | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
(0 | 
  )   | 
  | 
  | 
0 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
0 | 
  | 
 
|   Cash dividends   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,392 | 
  )   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,392 | 
  )   | 
 
|   Stock-based compensation expense   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
15,471 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
15,471 | 
  | 
 
|   Employee stock purchase plan expense   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
106 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
106 | 
  | 
 
|   Balances at December 31, 2020   | 
  | 
  | 
38,765 | 
  | 
  | 
$ | 
388 | 
  | 
  | 
$ | 
481,004 | 
  | 
  | 
$ | 
1,104,762 | 
  | 
  | 
$ | 
(64,238 | 
  )   | 
  | 
$ | 
8,938 | 
  | 
  | 
$ | 
1,530,854 | 
  | 
 
| Net earnings | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
45,782 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(380 | 
) | 
  | 
  | 
45,402 | 
  | 
 
| Other comprehensive income | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
215 | 
  | 
  | 
  | 
(69 | 
) | 
  | 
  | 
146 | 
  | 
 
| Share repurchases | 
  | 
  | 
(120 | 
) | 
  | 
  | 
(1 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
(43,177 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(43,178 | 
) | 
 
| Common stock issued for exercise of options | 
  | 
  | 
195 | 
  | 
  | 
  | 
2 | 
  | 
  | 
  | 
21,324 | 
  | 
  | 
  | 
(4,332 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
16,994 | 
  | 
 
| Common stock issued for restricted stock awards | 
  | 
  | 
10 | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
(0 | 
) | 
  | 
  | 
(1,801 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(1,801 | 
) | 
 
| Cash dividends | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,446 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,446 | 
) | 
 
| Stock-based compensation expense | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
10,232 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
10,232 | 
  | 
 
|        Common Stock issued to employee stock purchase plan | 
  | 
  | 
4 | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
1,328 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
1,328 | 
  | 
 
|   Employee stock purchase plan expense   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
411 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
411 | 
  | 
 
| Balances at March 31, 2021 | 
  | 
  | 
38,854 | 
  | 
  | 
$ | 
389 | 
  | 
  | 
$ | 
514,299 | 
  | 
  | 
$ | 
1,088,788 | 
  | 
  | 
$ | 
(64,023 | 
) | 
  | 
$ | 
8,489 | 
  | 
  | 
$ | 
1,547,942 | 
  | 
 
 
    
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  Accumulated   | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  Additional   | 
  | 
  | 
  | 
  | 
  | 
  | 
  Other   | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Common Stock   | 
  | 
  | 
  Paid-in   | 
  | 
  | 
  Retained   | 
  | 
  | 
  Comprehensive   | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Shares   | 
  | 
  | 
  Amount   | 
  | 
  | 
  Capital   | 
  | 
  | 
  Earnings   | 
  | 
  | 
  Income(Loss)   | 
  | 
  | 
  Total   | 
  | 
 
|   Balances at June 30, 2019   | 
  | 
  | 
37,934 | 
  | 
  | 
$ | 
379 | 
  | 
  | 
$ | 
316,797 | 
  | 
  | 
$ | 
931,934 | 
  | 
  | 
$ | 
(83,521 | 
  )   | 
  | 
$ | 
1,165,589 | 
  | 
 
|   Cumulative effect adjustments due to adoption of new accounting standards and other   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(879 | 
  )   | 
  | 
  | 
  | 
  | 
  | 
  | 
(879 | 
  )   | 
 
|   Net earnings   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
14,398 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
14,398 | 
  | 
 
|   Other comprehensive loss   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(8,106 | 
  )   | 
  | 
  | 
(8,106 | 
  )   | 
 
|   Common stock issued for exercise of options   | 
  | 
  | 
94 | 
  | 
  | 
  | 
1 | 
  | 
  | 
  | 
7,854 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
7,855 | 
  | 
 
|   Common stock issued for restricted stock awards   | 
  | 
  | 
50 | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
(0 | 
  )   | 
  | 
  | 
(1,926 | 
  )   | 
  | 
  | 
 | 
  | 
  | 
  | 
(1,926 | 
  )   | 
 
|   Cash dividends   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,169 | 
  )   | 
  | 
  | 
 | 
  | 
  | 
  | 
(12,169 | 
  )   | 
 
|   Stock-based compensation expense   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
8,267 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
8,267 | 
  | 
 
|   Common stock issued to employee stock purchase plan   | 
  | 
  | 
6 | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
1,096 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
1,096 | 
  | 
 
|   Employee stock purchase plan expense   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
99 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
99 | 
  | 
 
|   Balances at September 30, 2019   | 
  | 
  | 
38,084 | 
  | 
  | 
$ | 
381 | 
  | 
  | 
$ | 
334,112 | 
  | 
  | 
$ | 
931,358 | 
  | 
  | 
$ | 
(91,627 | 
  )   | 
  | 
$ | 
1,174,224 | 
  | 
 
|   Net earnings   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
119,622 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
119,622 | 
  | 
 
|   Other comprehensive loss   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
13,275 | 
  | 
  | 
  | 
13,275 | 
  | 
 
|   Common stock issued for exercise of options   | 
  | 
  | 
195 | 
  | 
  | 
  | 
2 | 
  | 
  | 
  | 
18,293 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
18,295 | 
  | 
 
|   Common stock issued for restricted stock awards   | 
  | 
  | 
4 | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
(0 | 
  )   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
0 | 
  | 
 
|   Cash dividends   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,197 | 
  )   | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,197 | 
  )   | 
 
|   Stock-based compensation expense   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
10,017 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
10,017 | 
  | 
 
|   Common stock issued to employee stock purchase plan   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Employee stock purchase plan expense   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
112 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
112 | 
  | 
 
|   Balances at December 31, 2019   | 
  | 
  | 
38,283 | 
  | 
  | 
$ | 
383 | 
  | 
  | 
$ | 
362,534 | 
  | 
  | 
$ | 
1,038,783 | 
  | 
  | 
$ | 
(78,352 | 
  )   | 
  | 
$ | 
1,323,348 | 
  | 
 
| Net earnings | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
36,432 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
36,432 | 
  | 
 
| Other comprehensive income (loss) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(25,105 | 
) | 
  | 
  | 
(25,105 | 
) | 
 
| Share Repurchases | 
  | 
  | 
(279 | 
) | 
  | 
  | 
(3) | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
(50,109 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
(50,112 | 
) | 
 
| Common stock issued for exercise of options | 
  | 
  | 
100 | 
  | 
  | 
  | 
1 | 
  | 
  | 
  | 
10,026 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
10,027 | 
  | 
 
| Common stock issued for restricted stock awards | 
  | 
  | 
1 | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
(0 | 
) | 
  | 
  | 
(114 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
(114 | 
) | 
 
| Cash dividends | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,279 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
(12,279 | 
) | 
 
| Stock-based compensation expense | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
7,745 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
7,745 | 
  | 
 
| Common stock issued to employee stock purchase plan | 
  | 
  | 
8 | 
  | 
  | 
  | 
0 | 
  | 
  | 
  | 
1,216 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
1,216 | 
  | 
 
| Employee stock purchase plan expense | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
110 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
110 | 
  | 
 
| Balances at March 31, 2020 | 
  | 
  | 
38,112 | 
  | 
  | 
$ | 
381 | 
  | 
  | 
$ | 
381,632 | 
  | 
  | 
$ | 
1,012,713 | 
  | 
  | 
$ | 
(103,458 | 
) | 
  | 
$ | 
1,291,268 | 
  | 
 
 
   
 | 
| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | 
    
|   | 
  | 
  Unrealized  Gains  (Losses) on  Derivative  Instruments   | 
  | 
  | 
  Foreign  Currency  Translation  Adjustments   | 
  | 
  | 
  Total   | 
  | 
 
|   Balance as of June 30, 2020 attributable to Bio-Techne   | 
  | 
$ | 
(13,253 | 
  )   | 
  | 
$ | 
(83,946 | 
  )   | 
  | 
$ | 
(97,199 | 
  )   | 
 
|   Other comprehensive income (loss) before reclassifications, net of taxes, attributable to Bio-Techne   | 
  | 
  | 
(13 | 
) | 
  | 
  | 
27,686 | 
  | 
  | 
  | 
27,673 | 
  | 
 
|   Reclassification from loss on derivatives to earnings, net of taxes, attributable to Bio-Techne(1)   | 
  | 
  | 
5,503 | 
  | 
  | 
  | 
- | 
  | 
  | 
  | 
5,503 | 
  | 
 
|   Balance as of March 31, 2021 attributable to Bio-Techne(3)   | 
  | 
$ | 
(7,763 | 
  )   | 
  | 
$ | 
(56,260 | 
  )   | 
  | 
$ | 
(64,023 | 
  )   | 
 
 
    
|   | 
  | 
  Unrealized  Gains  (Losses) on  Derivative  Instruments   | 
  | 
  | 
  Foreign  Currency  Translation  Adjustments   | 
  | 
  | 
  Total   | 
  | 
 
|   Balance as of June 30, 2019 attributable to Bio-Techne   | 
  | 
$ | 
(9,537 | 
  )   | 
  | 
$ | 
(73,983 | 
  )   | 
  | 
$ | 
(83,521 | 
  )   | 
 
|   Other comprehensive income (loss), net of tax before reclassifications, attributable to Bio-Techne   | 
  | 
  | 
(6,413 | 
) | 
  | 
  | 
(15,138 | 
) | 
  | 
  | 
(21,551 | 
) | 
 
|   Reclassification from loss on derivatives to interest expense, net of taxes, attributable to Bio-Techne(2)   | 
  | 
  | 
1,614 | 
  | 
  | 
  | 
- | 
  | 
  | 
  | 
1,614 | 
  | 
 
|   Balance as of March 31, 2020 attributable to Bio-Techne(3)   | 
  | 
$ | 
(14,336 | 
  )   | 
  | 
$ | 
(89,121 | 
  )   | 
  | 
$ | 
(103,458 | 
  )   | 
 
 
   
 |