Significant Accounting Policies - Effect of Corrections in Condensed Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2016	Jul. 30, 2016	Oct. 29, 2016	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Jan. 31, 2015
Cash flows from operating activities:
Change in accounts payable and accrued expenses	$ (14,604)	$ (63,483)	$ (63,435)	$ (50,307)	$ 29,196	$ 22,222	$ 22,222
Net cash provided by operating activities	(90,350)	(73,649)	(18,985)	78,845	126,704	79,243	79,243
Cash and cash equivalents:
Beginning of period	331,467	331,467	331,467	331,467	145,686	13,389	13,389
End of period	234,668	37,163	47,135	87,023	331,467	145,686	145,686
As Reported [Member]
Cash flows from operating activities:
Change in accounts payable and accrued expenses	(30,546)	(81,399)	(73,574)		44,378	25,470
Net cash provided by operating activities	(106,292)	(91,565)	(29,124)		141,886	82,491
Cash and cash equivalents:
Beginning of period	349,897	349,897	349,897	349,897	148,934	13,389
End of period	237,156	37,677	55,426		349,897	148,934	148,934
Adjustment [Member]
Cash flows from operating activities:
Change in accounts payable and accrued expenses	15,942	17,916	10,139		(15,182)	(3,248)
Net cash provided by operating activities	15,942	17,916	10,139		(15,182)	(3,248)
Cash and cash equivalents:
Beginning of period	(18,430)	(18,430)	(18,430)	$ (18,430)	(3,248)
End of period	$ (2,488)	$ (514)	$ (8,291)		$ (18,430)	$ (3,248)	$ (3,248)