Revolving Credit Facility - Additional Information (Detail) (USD $)	12 Months Ended
	Jan. 31, 2014	Sep. 27, 2013	Jun. 30, 2013	Jan. 31, 2013
Debt Instrument [Line Items]
Unsecured borrowing capacity			$ 500,000,000
Extended maturity period of revolving credit facility (in years)	1 year
Borrowings outstanding under the revolving credit facility	0	500,000,000		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 credit facility, to earnings before interest, taxes, depreciation and amortization (EBITDA) adjusted for other items as defined in the credit facility of not more than 3.0 to 1.0 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	3.25
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
Revolving Credit Facility
Debt Instrument [Line Items]
Unsecured borrowing capacity	$ 750,000,000