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Significant Accounting Policies (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 29, 2017 | Oct. 30, 2016 | Oct. 29, 2017 | Oct. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income taxes | $ 2,108,000 | $ 2,684,000 | $ 3,748,000 | $ 5,917,000
Accrued expenses and deferred compensation, operating activities |  |  | (3,607,000) | (2,469,000)
Common stock surrendered for withholding taxes payable, financing activities |  |  | 1,147,000 | 280,000
ASU No. 2016-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income taxes |  |  | $ (556,000) |
Excess tax benefit related to stock-based compensation, operating activities |  |  |  | 167,000
Excess tax benefit related to stock-based compensation, financing activities |  |  |  | 167,000
Accrued expenses and deferred compensation, operating activities |  |  |  | 280,000
Common stock surrendered for withholding taxes payable, financing activities |  |  |  | $ 280,000

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