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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

X

- Definition

The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid and in the obligation created by employee agreements whereby earned compensation will be paid in the future.

+ References

No definition available.

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- Definition

Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 25
-Paragraph 19A
-URI http://asc.fasb.org/extlink&oid=96949009&loc=SL79513924-113897

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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