Investments (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 30, 2016	Jan. 31, 2015
Schedule of Investments, Reported Amounts, by Category [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 71,953
Current available for sale Securities Unrecognized Holding Gain	477	$ 0
Current Available for Sale Securities Unrecognized Holding Loss	(435)	0
Short-term investments	226,027	171,201
Long-term investments	71,953	216,756
Long-Term Available for Sale Securities Unrecognized Holding Gain	22	0
Long-Term Available for Sale Securities Unrecognized Holding Loss	(222)	0
Held-to-maturity Securities, Fair Value		216,810
Investments, Fair Value Disclosure	226,027	171,268
Investment disclosure [Abstract]
Gross unrealized gains on short-term investments	0	117
Gross unrealized losses on short-term investments	0	(50)
Gross unrealized gains from long-term held-to-maturity investments	0	371
Gross unrealized losses on long-term held-to-maturity investments	0	(317)
Held-to-maturity Securities [Member] \| Amortized cost
Schedule of Investments, Reported Amounts, by Category [Line Items]
Short-term investments	0	154,054
Long-term investments	0	216,756
Available-for-sale Securities [Member] \| Carrying value
Schedule of Investments, Reported Amounts, by Category [Line Items]
Short-term investments	225,985	17,147
Long-term investments	$ 72,153	$ 0

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As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as a current held-to-maturity investment, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as a current held-to-maturity investment, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

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Current available for sale Securities Unrecognized Holding Gain

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Long-Term Available for Sale Securities Unrecognized Holding Gain

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Long-Term Available for Sale Securities Unrecognized Holding Loss

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Fair value of investments in debt securities classified as held-to-maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of unrecognized gain before loss on investments in held-to-maturity securities.

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Amount of unrecognized loss before gain on investments in held-to-maturity securities. Excludes write-down for other than temporary impairment (OTTI).

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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