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Warranty Reserve Included in Accrued Expenses and Other Current Liabilities (Detail) (Warranty Reserves, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Warranty Reserves
Deferred Revenue and Warranty Reserve [Line Items]
Warranty reserve, beginning of period	$ 17.6	$ 12.7	$ 15.1	$ 13.0
Warranty expense	1.6	2.8	7.7	5.2
Utilized	(1.6)	(1.6)	(5.2)	(4.3)
Warranty reserve, end of period	$ 17.6	$ 13.9	$ 17.6	$ 13.9

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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