Income Taxes - Deferred Tax Effects of Temporary Differences Giving Rise to the Company's Net Deferred Tax Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Deferred tax assets:
Deferred rent	$ 7,964	$ 7,981
State net operating loss carryforwards	3,141
Employee benefit accruals	3,071	2,915
Depreciation and amortization	2,245	1,729
Stock-based compensation	1,029	733
Inventory reserves	745	637
Foreign tax credit carryforwards		447
Other accruals	3,203	2,866
Other	1,529	1,444
Deferred tax assets (excluding state net operating loss carryforwards	22,927	18,752
Valuation allowance	(1,925)
Deferred tax asset, net of valuation allowance	21,002	18,752
Deferred tax liability:
Prepaid expenses	(520)	(528)
Net deferred tax assets	$ 20,482	$ 18,224