v3.6.0.2
Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Schedule of Investments, Reported Amounts, by Category [Line Items]    
Short-term investments $ 98,530 $ 226,027
Current available for sale Securities Unrecognized Holding Gain 101 477
Current Available for Sale Securities Unrecognized Holding Loss (364) (435)
Long-term investments 77,904 71,953
Long-Term Available for Sale Securities Unrecognized Holding Gain 133 22
Long-Term Available for Sale Securities Unrecognized Holding Loss (111) (222)
Available-for-sale Securities [Member] | Carrying value    
Schedule of Investments, Reported Amounts, by Category [Line Items]    
Short-term investments 98,793 225,985
Long-term investments $ 77,882 $ 72,153