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Significant Accounting Policies (Detail) - USD ($) | 3 Months Ended
--- | ---
Jul. 30, 2017 | Jul. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Income taxes | $ 1,640,000 | $ 3,233,000
Accrued expenses and deferred compensation, operating activities | (4,704,000) | (4,631,000)
Common stock surrendered for withholding taxes payable, financing activities | 1,135,000 | 280,000
ASU No. 2016-09 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Income taxes | $ (554,000) |
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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