Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 30, 2016	Jan. 30, 2016	Aug. 01, 2015
Schedule of Investments, Reported Amounts, by Category [Line Items]
Short-term investments	$ 103,467	$ 226,027	$ 140,821
Long-term investments	77,901	71,953	179,305
Current available for sale Securities Unrecognized Holding Gain	455	477	91
Long-Term Available for Sale Securities Unrecognized Holding Gain	33	22	14
Current Available for Sale Securities Unrecognized Holding Loss	(39)	(435)	(48)
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	(200)	(222)	(368)
Investment disclosure [Abstract]
Short-term investments(a)	103,467	226,027	140,821
Carrying value | Available-for-sale Securities [Member]
Schedule of Investments, Reported Amounts, by Category [Line Items]
Short-term investments	103,051	225,985	140,778
Long-term investments	$ 78,068	$ 72,153	$ 179,659