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The Incentive Stock Plans - Incentive Stock Plans Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options granted, Options Outstanding   0  
Stock Options [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares Available for Grant, Beginning Balance 1,386,561    
Options granted, Shares Available for Grant (5,000)    
Options cancelled/forfeited/expired, Shares Available for Grant 14,750    
Restricted stock awards issued, Shares Available for Grant (341,517)    
Restricted stock awards forfeited, Shares Available for Grant 42,689    
Additional shares of stock issued, Shares Available for Grant (7,328)    
Shares Available for Grant, Ending Balance 1,090,155   1,386,561
Options Outstanding, Beginning Balance 1,207,504    
Options granted, Options Outstanding 5,000    
Options cancelled/forfeited/expired, Options Outstanding (14,750)    
Options exercised, Options Outstanding (581,364)    
Options Outstanding, Ending Balance 616,390   1,207,504
Exercisable as of June 30, 2018, Options Outstanding 613,056    
Aggregate Intrinsic Value $ 4,159   $ 5,737
Exercisable as of June 30, 2018, Aggregate Intrinsic Value $ 4,159    
Weighted Average Exercise Price, Beginning Balance $ 11.81    
Options granted, Weighted Average Exercise Price 18.95    
Options cancelled/forfeited/expired, Weighted Average Exercise Price 12.27    
Options exercised, Weighted Average Exercise Price 11.44    
Weighted Average Exercise Price, Ending Balance 12.17   $ 11.81
Exercisable as of June 30, 2018, Weighted Average Exercise Price $ 12.21    
Weighted Average Remaining Contractual Life 4 years 8 months 12 days   5 years 3 months 18 days
Exercisable as of June 30, 2018, Weighted Average Remaining Contractual Life 4 years 8 months 12 days