Income Taxes - Income Tax (Benefit) Provision (Details) - USD ($) $ in Thousands	4 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 30, 2016	Sep. 30, 2014	Sep. 30, 2013
Summary of income tax provisions
Current (benefit) provision	$ (3,890)	$ (4,826)	$ 6,581	$ 16,017
Deferred provision (benefit)	(6,636)	2,020	(2,975)	(1,791)
Deferred benefit of state net operating loss carryforwards, net of federal effect, recognized based on change in tax regulations				(1,216)
Income tax (benefit) provision	(10,526)	(2,806)	3,606	13,010
Federal (benefit) provision	(9,296)	(1,962)	5,109	11,485
State (benefit) provision	(1,165)	(575)	(1,674)	380
Foreign (benefit) provision	$ (65)	$ (269)	$ 171	$ 1,145