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	May 05, 2018	Feb. 03, 2018
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, Fair Value, Less Than 12 Months	$ 62,848	$ 53,655
Marketable securities, Fair Value, 12 Months or Greater		610
Marketable securities, Fair Value, Total	62,848	54,265
Marketable securities, Unrealized Losses, Less Than 12 Months	(189)	(129)
Marketable securities, Unrealized Losses, 12 Months or Greater		(1)
Marketable securities, Unrealized Losses, Total	(189)	(130)
State and Local Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, Fair Value, Less Than 12 Months	62,848	53,655
Marketable securities, Fair Value, 12 Months or Greater		610
Marketable securities, Fair Value, Total	62,848	54,265
Marketable securities, Unrealized Losses, Less Than 12 Months	(189)	(129)
Marketable securities, Unrealized Losses, 12 Months or Greater		(1)
Marketable securities, Unrealized Losses, Total	$ (189)	$ (130)