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The Incentive Stock Plans - Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options granted, Options Outstanding 0 0  
Stock Options [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares Available for Grant, Beginning Balance 715,590    
Common stock, shares authorized 1,000,000    
Restricted stock awards issued, Shares Available for Grant (418,771)    
Restricted stock awards forfeited, Shares Available for Grant 7,150    
Additional shares of stock issued, Shares Available for Grant (5,678)    
Shares Available for Grant, Ending Balance 1,298,291   715,590
Options Outstanding, Beginning Balance 484,031    
Options exercised, Options Outstanding (41,167)    
Options Outstanding, Ending Balance 442,864   484,031
Exercisable as of March 31, 2020, Options Outstanding 441,197    
Aggregate Intrinsic Value $ 402   $ 1,569
Excercisable as of March 31, 2020, Aggregate Intrinsic Value $ 402    
Weighted Average Exercise Price, Beginning Balance $ 12.42    
Options exercised, Weighted Average Exercise Price 12.76    
Weighted Average Exercise Price, Ending Balance 12.39   $ 12.42
Excercisable as of March 31, 2020, Weighted Average Exercise Price $ 12.37    
Weighted Average Remaining Contractual Life 3 years 2 months 12 days   3 years 8 months 12 days
Excercisable as of March 31, 2020, Weighted Average Remaining Contractual Life 3 years 2 months 12 days