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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Jan. 28, 2018 USD ($) Store	Jan. 29, 2017 USD ($)	Jan. 31, 2016 USD ($)	Apr. 30, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of stores | Store	631
Inventory obsolescence reserves	$ 12,649,000	$ 13,770,000
Advertising expenses	382,206,000	347,474,000	$ 333,276,000
Asset impairment charges	0	1,765,000	2,100,000
Goodwill	18,838,000	18,680,000
Goodwill impairment	0	0	$ 0
Self-insurance reserves	$ 26,370,000	$ 24,988,000
Period of recognition for stored-value card	4 years
Retained Earnings | Adjustments for New Accounting Pronouncement | Scenario, Forecast
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect of net pre-tax increase to retained earnings				$ 30,000,000

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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