Warranty Reserves (Detail) (Warranty Reserves, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013	Feb. 01, 2014
Warranty Reserves
Product Warranty Accrual, Balance Sheet Classification [Abstract]
Warranty reserve, beginning of period	$ 48.1	$ 18.6	$ 19.1	$ 18.5
Current liabilities	17.6	6.6	17.6	6.6	6.7
Warranty obligations acquired			28.8
Non-current liabilities	29.1	12.2	29.1	12.2	12.4
Warranty expense	1.2	1.8	5.2	5.3
Total warranty reserve	46.7	18.8	46.7	18.8
Utilized	(2.6)	(1.6)	(6.4)	(5.0)
Warranty reserve, end of period	$ 46.7	$ 18.8	$ 46.7	$ 18.8