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The Incentive Stock Plans - Incentive Stock Plans Activity (Detail) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance   732,103
Options authorized, Shares Available for Grant   1,000,000
Options cancelled/forfeited/expired, Shares Available for Grant   43,667
Restricted stock awards issued, Shares Available for Grant   (358,342)
Restricted stock awards forfeited, Shares Available for Grant   1,000
Additional shares of stock issued, Shares Available for Grant   (38,938)
Shares Available for Grant, Ending Balance 732,103 1,379,490
Options Outstanding, Beginning Balance   1,451,102
Options cancelled/forfeited/expired, Options Outstanding   (43,667)
Options exercised, Options Outstanding   (138,911)
Options Outstanding, Ending Balance 1,451,102 1,268,524
Exercisable as of March 31, 2017, Options Outstanding   1,015,023
Aggregate Intrinsic Value $ 12,397 $ 12,242
Exercisable as of March 31, 2017, Aggregate Intrinsic Value   $ 10,787
Weighted Average Exercise Price, Beginning Balance   $ 12.33
Options cancelled/forfeited/expired, Weighted Average Exercise Price   25.83
Options exercised, Weighted Average Exercise Price   11.51
Weighted Average Exercise Price, Ending Balance $ 12.33 11.95
Exercisable as of March 31, 2017, Weighted Average Exercise Price   $ 10.97
Weighted Average Remaining Contractual Life 6 years 5 years 9 months 18 days
Exercisable as of March 31, 2017, Weighted Average Remaining Contractual Life   5 years 3 months 18 days