Annual report pursuant to Section 13 and 15(d)

Share-based compensation and other benefit plans - Additional Information (Detail)

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Share-based compensation and other benefit plans - Additional Information (Detail) (USD $)
12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock outstanding awards 575,000 499,000 440,000 398,000
Weighted average fair value of options granted during the period $ 14.14 $ 14.58 $ 14.76  
Total intrinsic value of options exercised $ 338,000.0 $ 3,100,000 $ 1,600,000  
Total fair value of options vested 1,600,000 1,000,000 1,100,000  
Stock-based compensation cost 1,641,000 1,138,000 1,135,000  
Total unrecognized compensation cost related to non-vested stock options which will be expensed in fiscal 2013 through 2015 2,100,000      
Weighted average period over which the compensation cost is expected to be recognized 1 year 2 months 12 days      
Options for common stock granted 95,000 188,000 115,000  
Equity Incentive Plan 2010
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for grant 3,000,000      
Number of shares available for grant 2,700,000      
Maximum term of options granted under all Plans 10 years      
Common stock outstanding awards 276,000      
1998 Nonqualified Stock Option Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock outstanding awards 245,000      
1997 Incentive Stock Option Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock outstanding awards 54,000      
Stock Bonus Plans
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Benefit plan contributions charged to operation 715,000 690,000 419,000  
Performance Incentive Program | Executive Officer
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Bonuses under certain employment agreements with executive officers 31,000 39,000 44,000  
Options for common stock granted 22,932 3,364 40,697  
UNITED STATES | Profit Sharing and Savings Plans
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Benefit plan contributions charged to operation 754,000 718,000 341,000  
R&D Europe and Tocris | Defined Contribution Pension Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Benefit plan contributions charged to operation $ 499,000 $ 240,000 $ 162,000