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The Incentive Stock Plans - Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
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 1,047,247    
Options cancelled/forfeited/expired, Shares Available for Grant 7,917    
Restricted stock awards issued, Shares Available for Grant (319,624)    
Restricted stock awards forfeited, Shares Available for Grant 9,550    
Additional shares of stock issued, Shares Available for Grant (7,806)    
Shares Available for Grant, Ending Balance 737,284   1,047,247
Options Outstanding, Beginning Balance 611,223    
Options cancelled/forfeited/expired, Options Outstanding (7,917)    
Options exercised, Options Outstanding (109,275)    
Options Outstanding, Ending Balance 494,031   611,223
Excercisable as of June 30, 2019, Options Outstanding 492,364    
Aggregate Intrinsic Value $ 2,069   $ 5,544
Excercisable as of June 30, 2019, Aggregate Intrinsic Value $ 2,069    
Weighted Average Exercise Price, Beginning Balance $ 12.18    
Options cancelled/forfeited/expired, Weighted Average Exercise Price 5.23    
Options exercised, Weighted Average Exercise Price 12.07    
Weighted Average Exercise Price, Ending Balance 12.32   $ 12.18
Excercisable as of June 30, 2019, Weighted Average Exercise Price $ 12.29    
Weighted Average Remaining Contractual Life 3 years 10 months 24 days   4 years 4 months 24 days
Excercisable as of June 30, 2019, Weighted Average Remaining Contractual Life 3 years 10 months 24 days