The Incentive Stock Plans - Incentive Stock Plans Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Available for Grant, Beginning Balance	1,062,448
Options authorized, Shares Available for Grant	1,000,000		500,000
Options granted, Shares Available for Grant	(572,250)
Options cancelled/forfeited/expired, Shares Available for Grant	215,266
Restricted stock awards forfeited, Shares Available for Grant	11,773
Options exercised, Shares Available for Grant
Shares Available for Grant, Ending Balance	1,717,237	1,062,448
Options Outstanding, Beginning Balance	2,507,685
Options granted, Options Outstanding	572,250
Options cancelled/forfeited/expired, Options Outstanding	(215,266)
Options exercised, Options Outstanding	(453,692)
Options Outstanding, Ending Balance	2,410,977	2,507,685
Exercisable at June 30, 2013, Options Outstanding	1,805,947
Aggregate Intrinsic Value, Beginning Balance	$ 4,588
Aggregate Intrinsic Value, Ending Balance	9,197	4,588
Exercisable at June 30, 2013, Aggregate Intrinsic Value	$ 6,710
Weighted Average Exercise Price, Beginning Balance	$ 9.86
Options granted, Weighted Average Exercise Price	$ 7.62
Options cancelled/forfeited/expired, Weighted Average Exercise Price	$ 9.05
Options exercised, Weighted Average Exercise Price	$ 5.27
Weighted Average Exercise Price, Ending Balance	$ 10.26	$ 9.86
Exercisable at June 30, 2013, Weighted Average Exercise Price	$ 11.27
Weighted Average Remaining Contractual Life	6 years 8 months 12 days	6 years 6 months
Exercisable at June 30, 2013, Weighted Average Remaining Contractual Life	5 years 10 months 24 days