v3.5.0.2
Gross Realized Gains and Losses on Sales of Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 30, 2016
Aug. 01, 2015
Jul. 30, 2016
Aug. 01, 2015
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains $ 280 $ 255 $ 668 $ 698
Gross realized losses (19) (230) (243) (337)
Total net realized gains $ 261 $ 25 $ 425 $ 361