Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income before income taxes:
U.S.	$ 23,555	$ 67,968	$ 44,244
Foreign	8,443	9,027	5,154
Income before income taxes	31,998	76,995	49,398
Current:
U.S. Federal	2,125	15,836	5,952
Foreign	1,419	1,712	2,145
State	85	2,079	825
Total	3,629	19,627	8,922
Deferred:
U.S. Federal	5,907	6,314	7,411
Foreign	623	585	(685)
State	262	601	2,308
Valuation allowance	0	(314)	314
Total	6,792	7,186	9,348
Total provision for income taxes	10,421	26,813	18,270
Effective income tax rate reconciliation
Statutory federal tax rate (as a percent)	35.00%	35.00%	35.00%
Tax provision for income taxes at the statutory rate	11,199	26,949	17,289
Foreign tax rate differentials	(913)	(864)	(342)
Provision for state taxes, net of federal taxes	473	1,578	1,289
U.S. tax on distributed and undistributed earnings of foreign subsidiaries	354	335
Manufacturer's deduction	(217)	(1,715)	(910)
Tax credits	(78)		(713)
State tax rate reduction impact on deferred tax asset	(182)	89	1,228
Change in Valuation Allowance		(314)	314
Other, net	(215)	755	115
Total provision for income taxes	$ 10,421	$ 26,813	$ 18,270
Effective tax rate (as a percent)	32.60%	34.80%	37.00%