Nature of Business and Basis of Presentation - Additional Information (Detail) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 04, 2018 USD ($)	Aug. 04, 2018 USD ($) Store	Jul. 29, 2017 USD ($)	Aug. 04, 2018 USD ($) Store	Jul. 29, 2017 USD ($)	Feb. 03, 2018 USD ($)
Nature Of Business And Basis Of Presentation [Line Items]
Operated stores | Store		703		703
Allowance for sales returns				$ 2,900		$ 2,600
Current liability for gift cards		$ 2,600		2,600		6,400
Deferred revenue related to our customer loyalty program		1,900		1,900		1,600
Cumulative-effect adjustment to retained earnings, net of tax				2,052
Other liabilities		21,274		21,274		25,924
Inventory		149,656		149,656		125,826
Deferred tax assets		4,417		4,417		4,174
Income taxes payable		2,580		2,580		$ 5,796
Adoption of ASC 606 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Cumulative-effect adjustment to retained earnings, net of tax	$ 2,100
Cumulative-effect adjustment to retained earnings, tax	600
Other liabilities	(3,100)
Inventory	(400)
Deferred tax assets	(400)
Income taxes payable	$ 200
Gift Card Breakage Revenue [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Deferred revenue recognized		$ 100	$ 100	$ 200	$ 200
United States [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Operated stores | Store		611		611
Canada [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Operated stores | Store		50		50
Europe [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Operated stores | Store		35		35
Australia [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Operated stores | Store		7		7