v3.8.0.1
Investments - Gross Realized Gains and Losses on Sales of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Investments, Debt and Equity Securities [Abstract]      
Gross realized gains $ 186 $ 2,047 $ 1,654
Gross realized losses (2,963) (547) (1,923)
Impairment loss 0 0 (1,204)
Total net realized gains (losses) $ (2,777) $ 1,500 $ (1,473)