Summary of Investments (Detail) - USD ($) $ in Thousands	Jul. 30, 2016	Jan. 30, 2016
Gain (Loss) on Investments [Line Items]
Available-for-sale securities, Amortized Cost	$ 910,478	$ 1,016,520
Available-for-sale securities, Gross Unrealized Gains		958
Available-for-sale securities, Gross Unrealized Losses		(1,613)
Available-for-sale securities, Estimated Fair Value	914,231	1,015,865
Total investments, amortized cost	910,478
Total investments Gross Unrealized Gains	3,979
Total investments Gross Unrealized Losses	(226)
Total investments Estimated Fair Value	914,231
Short-term Investments
Gain (Loss) on Investments [Line Items]
Available-for-sale securities, Amortized Cost		1,005,224
Available-for-sale securities, Gross Unrealized Gains		958
Available-for-sale securities, Gross Unrealized Losses		(1,613)
Available-for-sale securities, Estimated Fair Value		1,004,569
Total Amortized Cost	901,504
Total Gross Unrealized Gains	3,979
Total Gross Unrealized Losses	(226)
Total Estimated Fair Value	905,257
Short-term Investments \| Time deposits
Gain (Loss) on Investments [Line Items]
Held-to-maturity securities, Amortized Cost	125,000
Held-to-maturity securities, Gross Unrealized Gains	0
Held-to-maturity securities, Gross Unrealized Losses	0
Held-to-maturity securities, Estimated Fair Value	125,000
Short-term Investments \| Corporate debt securities
Gain (Loss) on Investments [Line Items]
Available-for-sale securities, Amortized Cost	475,483	558,337
Available-for-sale securities, Gross Unrealized Gains	3,519	766
Available-for-sale securities, Gross Unrealized Losses	(154)	(1,282)
Available-for-sale securities, Estimated Fair Value	478,848	557,821
Short-term Investments \| U.S. government and agency debt
Gain (Loss) on Investments [Line Items]
Available-for-sale securities, Amortized Cost	206,056	317,595
Available-for-sale securities, Gross Unrealized Gains	273	64
Available-for-sale securities, Gross Unrealized Losses	(53)	(254)
Available-for-sale securities, Estimated Fair Value	206,276	317,405
Short-term Investments \| Asset-backed securities
Gain (Loss) on Investments [Line Items]
Available-for-sale securities, Amortized Cost	51,489	76,711
Available-for-sale securities, Gross Unrealized Gains	132	81
Available-for-sale securities, Gross Unrealized Losses	(13)	(56)
Available-for-sale securities, Estimated Fair Value	51,608	76,736
Short-term Investments \| Foreign government and agency debt
Gain (Loss) on Investments [Line Items]
Available-for-sale securities, Amortized Cost	14,603	21,370
Available-for-sale securities, Gross Unrealized Gains	14	2
Available-for-sale securities, Gross Unrealized Losses	(2)	(14)
Available-for-sale securities, Estimated Fair Value	14,615	21,358
Short-term Investments \| Municipal Debt Securities
Gain (Loss) on Investments [Line Items]
Available-for-sale securities, Amortized Cost	28,873	31,211
Available-for-sale securities, Gross Unrealized Gains	41	45
Available-for-sale securities, Gross Unrealized Losses	(4)	(7)
Available-for-sale securities, Estimated Fair Value	28,910	31,249
Long-term investments
Gain (Loss) on Investments [Line Items]
Available-for-sale securities, Amortized Cost	8,974	11,296
Available-for-sale securities, Estimated Fair Value	8,974	11,296
Long-term investments \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Available-for-sale securities, Amortized Cost	8,974	11,296
Available-for-sale securities, Estimated Fair Value	$ 8,974	$ 11,296

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