The Incentive Stock Plans - Incentive Stock Plans Option Activity (Detail) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Available for Grant, Beginning Balance	1,050,523
Options granted, Shares Available for Grant	(5,000)
Options cancelled/forfeited/expired, Shares Available for Grant	169,762
Restricted stock awards issued, Shares Available for Grant	(281,260)
Restricted stock awards forfeited, Shares Available for Grant	2,000
Shares Available for Grant, Ending Balance	936,025	1,050,523
Options Outstanding, Beginning Balance	1,937,874
Options granted, Options Outstanding	5,000
Options cancelled/forfeited/expired, Options Outstanding	(169,762)
Options exercised, Options Outstanding	(75,586)
Options Outstanding, Ending Balance	1,697,526	1,937,874
Exercisable as of June 30, 2016, Options Outstanding	973,191
Aggregate Intrinsic Value	$ 8,383	$ 6,285
Exercisable as of June 30, 2016, Aggregate Intrinsic Value	$ 7,879
Weighted Average Exercise Price, Beginning Balance	$ 12.95
Options granted, Weighted Average Exercise Price	16.97
Options cancelled/forfeited/expired, Weighted Average Exercise Price	26.83
Options exercised, Weighted Average Exercise Price	5.87
Weighted Average Exercise Price, Ending Balance	11.89	$ 12.95
Exercisable as of June 30, 2016, Weighted Average Exercise Price	$ 8.96
Weighted Average Remaining Contractual Life	6 years 2 months 12 days	6 years 6 months
Exercisable as of June 30, 2016, Weighted Average Remaining Contractual Life	5 years