v3.5.0.2
Summary of Investments Gross Unrealized Losses and Fair Value (Detail) - USD ($)
$ in Thousands
Jul. 30, 2016
Jan. 30, 2016
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value $ 131,204 $ 612,510
Less than 12 months Unrealized Losses (130) (1,566)
12 months or more Fair Value 33,430 15,954
12 months or more Unrealized Losses (96) (47)
Total Fair Value 164,634 628,464
Total Unrealized Losses (226) (1,613)
Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 57,734 283,138
Less than 12 months Unrealized Losses (75) (1,237)
12 months or more Fair Value 20,946 14,383
12 months or more Unrealized Losses (79) (45)
Total Fair Value 78,680 297,521
Total Unrealized Losses (154) (1,282)
U.S. government and agency debt    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 60,760 263,325
Less than 12 months Unrealized Losses (46) (254)
12 months or more Fair Value 6,993  
12 months or more Unrealized Losses (7)  
Total Fair Value 67,753 263,325
Total Unrealized Losses (53) (254)
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 7,003 46,646
Less than 12 months Unrealized Losses (6) (56)
12 months or more Fair Value 3,994  
12 months or more Unrealized Losses (7)  
Total Fair Value 10,997 46,646
Total Unrealized Losses (13) (56)
Foreign government and agency debt    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 4,411 16,458
Less than 12 months Unrealized Losses (2) (14)
Total Fair Value 4,411 16,458
Total Unrealized Losses (2) (14)
Municipal Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 1,296 2,943
Less than 12 months Unrealized Losses (1) (5)
12 months or more Fair Value 1,497 1,571
12 months or more Unrealized Losses (3) (2)
Total Fair Value 2,793 4,514
Total Unrealized Losses $ (4) $ (7)