Basic and Diluted Weighted-Average Number of Common Shares Outstanding (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted-average common shares outstanding	139.3	143.6	139.6	144.5
Effect of Dilution:
Stock options and awards	1.6	2.1	1.8	2.1
Weighted-average common shares assuming dilution	140.9	145.7	141.4	146.6