Debt (Additional Information) (Detail) (USD $)	3 Months Ended	9 Months Ended		3 Months Ended
	May 03, 2013	Oct. 31, 2014	Aug. 01, 2014	Oct. 31, 2014 Senior Notes	Oct. 31, 2014 Notes Which Mature In July 2033	Jan. 31, 2014 Notes Which Mature In July 2033	Oct. 31, 2014 Notes Which Mature In July 2033 Senior Notes	Oct. 31, 2014 Notes Which Mature In December 2040	Jan. 31, 2014 Notes Which Mature In December 2040	Oct. 31, 2014 Notes Which Mature In December 2040 Senior Notes
Debt Instrument [Line Items]
Senior unsecured notes					$ 201,000,000	$ 296,000,000		$ 291,000,000	$ 300,000,000
Fair value adjustment		2,000,000
Debt Instrument, Repurchase Amount							96,000,000			9,000,000
Repurchase and retirement of long term debt				102,000,000
Unsecured borrowing capacity		500,000,000	750,000,000
Extended maturity date of revolving credit facility	Mar. 01, 2017
Ratio of consolidated funded debt to EBITDA, numerator, maximum, until Jan 29, 2016		4.0
Revolving credit facility financial covenants description		For a period of four trailing fiscal quarters, the Company maintains a ratio of consolidated funded debt, including borrowings under this facility, to EBITDA adjusted for other items as defined in the credit facility of not more than 4.0 to 1.0 until no later than January 29, 2016 and 3.75 to 1.0 thereafter, and a ratio of EBITDA adjusted for other items as defined in the credit facility to interest expense of greater than 3.5 to 1.0.
Ratio of consolidated funded debt to EBITDA, numerator, maximum		3.75
Ratio of consolidated funded debt to EBITDA, denominator, maximum		1.0
Minimum ratio of EBITDA to interest expense, numerator		3.5
Minimum ratio of EBITDA to interest expense, denominator		1.0
Available borrowing capacity		$ 500,000,000