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The Incentive Stock Plans - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
Jan. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted average grant fair value of options granted   $ 0 $ 6.88  
Total intrinsic value of options exercised   $ 1,600,000 $ 950,000  
Unrecognized compensation costs related to non-vested options   268,000 1,300,000  
Fair value of options vested   $ 2,500,000 $ 152,000  
Incentive Stock Plan 2011 [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock, shares authorized       2,200,456
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] | Subject To Award [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock, shares authorized   3,000,000    
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   3 months 18 days 10 months 24 days  
Maximum [Member] | Incentive Stock Plan 2011 [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock, shares authorized 3,200,456