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	Jul. 30, 2016	Jan. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, Fair Value, Less Than 12 Months	$ 5,068	$ 16,884
Marketable securities, Fair Value, 12 Months or Greater	305	853
Marketable securities, Fair Value, Total	5,373	17,737
Marketable securities, Unrealized Losses, Less Than 12 Months	(12)	(15)
Marketable securities, Unrealized Losses, 12 Months or Greater	(1)	(172)
Marketable securities, Unrealized Losses, Total	(13)	(187)
State and Local Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, Fair Value, Less Than 12 Months	5,068	16,884
Marketable securities, Fair Value, 12 Months or Greater	305	853
Marketable securities, Fair Value, Total	5,373	17,737
Marketable securities, Unrealized Losses, Less Than 12 Months	(12)	(15)
Marketable securities, Unrealized Losses, 12 Months or Greater	(1)	(172)
Marketable securities, Unrealized Losses, Total	$ (13)	$ (187)