Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Fair Value Measurements (Details Textual)

Note 5 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jun. 30, 2020	Oct. 31, 2018
Interest Expense, Total				$ 2,660	$ 4,486	$ 10,661	$ 14,580
Nonoperating Income (Expense), Total				(23,272)	(970)	(27,652)	96,843
Income Tax Expense (Benefit), Total				(48)	$ 10,389	16,121	44,501
Business Combination, Liabilities Arising from Contingencies, Amount Recognized				10,800		10,800
QT Holdings Corporation [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High				51,000		51,000
Business Combination, Liabilities Arising from Contingencies, Amount Recognized				5,300		5,300
B-MoGen [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High				38,000		38,000
Business Combination, Liabilities Arising from Contingencies, Amount Recognized				5,500		5,500
Reclassification out of Accumulated Other Comprehensive Income [Member] \| AOCI Attributable to Parent [Member]
Interest Expense, Total						6,662	2,102
Nonoperating Income (Expense), Total						512
Income Tax Expense (Benefit), Total						(1,670)	(488)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Designated as Hedging Instrument [Member] \| AOCI Attributable to Parent [Member]
Interest Expense, Total						6,700	2,100
Nonoperating Income (Expense), Total						(500)
Income Tax Expense (Benefit), Total						(1,700)	$ (500)
Embedded Derivative Financial Instruments [Member] \| Cash Flow Hedging [Member]
Derivative, Notional Amount										$ 380,000
Derivative Notional Amount, Decrease in Period			$ 100,000
Embedded Derivative Financial Instruments [Member] \| Cash Flow Hedging [Member] \| Other Noncurrent Liabilities [Member]
Derivative Notional Amount, Dedesignated								$ 80,000	$ 80,000
Derivative, Fair Value, De-designed				1,400		1,400
Embedded Derivative Financial Instruments [Member] \| Cash Flow Hedging [Member] \| Forecast [Member]
Derivative Notional Amount, Decrease in Period	$ 200,000	$ 80,000
CCXI [Member]
Investments, Total				6,600		6,600			6,600
Investments, Fair Value Disclosure, Total				$ 6,500		$ 6,500			$ 8,000