Valuation and Qualifying Accounts - (Details) - Product return reserve - USD ($) $ in Thousands	4 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 30, 2016	Sep. 30, 2014	Sep. 30, 2013
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 2,708	$ 2,084	$ 2,702	$ 2,225
Additions charged to costs and expenses			6	477
Deductions and reclassifications	(624)	(348)
Balance at end of period	$ 2,084	$ 1,736	$ 2,708	$ 2,702