Warranty Reserves (Detail) (Warranty Reserves, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 02, 2014	Aug. 03, 2013	Aug. 02, 2014	Aug. 03, 2013	Feb. 01, 2014	Apr. 23, 2013
Warranty Reserves
Product Warranty Accrual, Balance Sheet Classification [Abstract]
Warranty reserve, beginning of period	$ 19.4		$ 19.1	$ 18.5		$ 18.6
Current liabilities	17.6	6.6	17.6	6.6	6.7
Warranty obligations acquired	28.8		28.8
Non-current liabilities	30.5	12.0	30.5	12.0	12.4
Warranty expense	2.3	1.9	4.0	3.5
Total warranty reserve	48.1	18.6	48.1	18.6		18.6
Utilized	(2.4)	(1.9)	(3.8)	(3.4)
Warranty reserve, end of period	$ 48.1	$ 18.6	$ 48.1	$ 18.6		$ 18.6