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The Incentive Stock Plans - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Feb. 28, 2013
Jun. 30, 2015
Jun. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted average grant fair value of options granted   $ 5.79 $ 6.23
Total intrinsic value of options exercised   $ 8,500,000 $ 3,500,000
Unrecognized compensation costs related to non-vested options   2,600,000 2,500,000
Fair value of options vested   $ 601,000 $ 1,600,000
Incentive Stock Plan 2011 [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock, shares authorized   2,000,000  
Additional Common Shares Authorized 1,000,000    
Expiration of Plan 2011   2021-01  
Contractual term of plan 2011   10 years  
Incentive Stock Plan 2011 [Member] | Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock, shares authorized 1,200,456    
Incentive Stock Plan 2011 [Member] | Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock, shares authorized 2,200,456    
Incentive Stock Plan 2007 [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Common stock shares available   200,456  
Incentive Stock Plans [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted average period unrecognized compensation costs related to non-vested options are expected to be recognized   1 year 9 months 18 days 2 years 2 months 12 days