Fair Value Hierarchy for Financial Assets (Cash Equivalents and Investments) Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 30, 2016	Jan. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 260,067	$ 410,697
Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	205,359	370,692
Money-market
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	54,708	40,005
Fair Value, Measurements, Recurring | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 260,067	$ 410,697
Carrying Amount, Percent to total	100.00%	100.00%
Fair Value, Measurements, Recurring | Carrying Amount | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 205,359	$ 370,692
Fair Value, Measurements, Recurring | Carrying Amount | Money-market
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	54,708	40,005
Fair Value, Measurements, Recurring | Fair Value | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 260,067	$ 410,697
Fair Value, Percent to total	100.00%	100.00%
Fair Value, Measurements, Recurring | Fair Value | Cash | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 205,359	$ 370,692
Fair Value, Measurements, Recurring | Fair Value | Money-market | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 54,708	$ 40,005