Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Available-for-sale:
Amortized Cost	$ 955,113	$ 859,684
Estimated Fair Value	952,790	858,883
Held-to-Maturity:
Amortized Cost	955,112	859,684
Gross Unrealized Gains	521	404
Gross Unrealized Losses	(2,843)	(1,205)
Estimated Fair Value	952,790	858,883
Short-term Investments
Held-to-Maturity:
Amortized Cost	955,112	855,069
Gross Unrealized Gains	521	404
Gross Unrealized Losses	(2,843)	(1,205)
Estimated Fair Value	952,790	854,268
U.S. government and agency debt
Available-for-sale:
Amortized Cost	248,336	185,584
Gross Unrealized Gains	49	86
Gross Unrealized Losses	(644)	(283)
Estimated Fair Value	247,741	185,387
Foreign government and agency debt
Available-for-sale:
Amortized Cost	7,004	13,425
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(17)	(50)
Estimated Fair Value	6,987	13,375
Municipal debt securities
Available-for-sale:
Amortized Cost	2,734	27,916
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(6)	(49)
Estimated Fair Value	2,728	27,871
Corporate debt securities
Available-for-sale:
Amortized Cost	504,609	432,603
Gross Unrealized Gains	469	281
Gross Unrealized Losses	(1,999)	(776)
Estimated Fair Value	503,079	432,108
Asset backed securities
Available-for-sale:
Amortized Cost	42,429	45,541
Gross Unrealized Gains	3	33
Gross Unrealized Losses	(177)	(47)
Estimated Fair Value	42,255	45,527
Time deposits
Held-to-Maturity:
Amortized Cost	150,000	150,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 150,000	150,000
Long-term investments
Held-to-Maturity:
Amortized Cost		4,615
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		4,615
Auction rate securities
Available-for-sale:
Amortized Cost		4,615
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		$ 4,615

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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