Income Taxes - Income Tax (Benefit) Provision (Details) - USD ($) $ in Thousands	4 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 28, 2017	Jan. 30, 2016	Sep. 30, 2014
Summary of income tax provisions
Current provision (benefit)	$ (3,890)	$ 436	$ (4,826)	$ 6,581
Deferred provision (benefit)	(6,636)	24,614	2,020	(2,975)
Income tax provision (benefit)	(10,526)	25,050	(2,806)	3,606
Federal provision (benefit)	(9,296)	19,202	(1,962)	5,109
State provision (benefit)	(1,165)	5,679	(575)	(1,674)
Foreign provision (benefit)	$ (65)	$ 169	$ (269)	$ 171