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Cash, Cash Equivalents and Marketable Securities - Summary of Gross Unrealized Holding Losses and Fair Value for Investments in an Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Feb. 02, 2019
Feb. 03, 2018
Schedule of Available-for-sale Securities [Line Items]    
Marketable securities, Fair Value, Less Than 12 Months $ 41,509 $ 53,655
Marketable securities, Fair Value, 12 Months or Greater 9,548 610
Marketable securities, Fair Value, Total 51,057 54,265
Marketable securities, Unrealized Losses, Less Than 12 Months (28) (129)
Marketable securities, Unrealized Losses, 12 Months or Greater (23) (1)
Marketable securities, Unrealized Losses, Total (51) (130)
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Marketable securities, Fair Value, Less Than 12 Months 14,523  
Marketable securities, Fair Value, Total 14,523  
Marketable securities, Unrealized Losses, Less Than 12 Months (8)  
Marketable securities, Unrealized Losses, Total (8)  
State and Local Government Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Marketable securities, Fair Value, Less Than 12 Months 26,986 53,655
Marketable securities, Fair Value, 12 Months or Greater 9,548 610
Marketable securities, Fair Value, Total 36,534 54,265
Marketable securities, Unrealized Losses, Less Than 12 Months (20) (129)
Marketable securities, Unrealized Losses, 12 Months or Greater (23) (1)
Marketable securities, Unrealized Losses, Total $ (43) $ (130)