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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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