CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	4 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 28, 2017	Jan. 30, 2016	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 165,644	$ 433,699	$ 498,753	$ 516,959
Cost of goods sold	96,667	206,271	252,713	247,501
Gross profit	68,977	227,428	246,040	269,458
Selling, general and administrative expenses	86,688	223,881	246,914	250,253
Store closing, asset impairment and asset disposal expenses (income)	4,599	2,768	(2,084)	1,469
Other charges, net	5,354	4,914	6,979	3,229
Operating income (loss)	(27,664)	(4,135)	(5,769)	14,507
Interest expense, net	242	3,575	1,520	404
Income (loss) before income taxes	(27,906)	(7,710)	(7,289)	14,103
Income tax provision (benefit)	(10,526)	25,050	(2,806)	3,606
Net income (loss)	$ (17,380)	$ (32,760)	$ (4,483)	$ 10,497
Net income (loss) per share—Basic	$ (1.28)	$ (2.39)	$ (0.33)	$ 0.78
Average shares outstanding—Basic	13,541	13,702	13,596	13,451
Net income (loss) per share—Diluted	$ (1.28)	$ (2.39)	$ (0.33)	$ 0.77
Average shares outstanding—Diluted	13,541	13,702	13,596	13,572