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	Jan. 30, 2016	Jan. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, Fair Value, Less Than 12 Months	$ 16,884	$ 27,701
Marketable securities, Fair Value, 12 Months or Greater	853	823
Marketable securities, Fair Value, Total	17,737	28,524
Marketable securities, Unrealized Losses, Less Than 12 Months	(15)	(9)
Marketable securities, Unrealized Losses, 12 Months or Greater	(172)	(177)
Marketable securities, Unrealized Losses, Total	(187)	(186)
State and Local Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, Fair Value, Less Than 12 Months	16,884	27,701
Marketable securities, Fair Value, 12 Months or Greater	853	823
Marketable securities, Fair Value, Total	17,737	28,524
Marketable securities, Unrealized Losses, Less Than 12 Months	(15)	(9)
Marketable securities, Unrealized Losses, 12 Months or Greater	(172)	(177)
Marketable securities, Unrealized Losses, Total	$ (187)	$ (186)