Accrued Expenses and Other Current Liabilities - Summary of Activity in Sales Returns Reserve (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 14.0	$ 15.3	$ 8.4
Net adjustment	(1.0)	(1.3)	6.9
Ending balance	$ 13.0	$ 14.0	$ 15.3