Income Taxes - Allocation of Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	Apr. 29, 2018	Apr. 30, 2017	May 01, 2016
Income Tax Disclosure [Abstract]
income from operations	$ (6,217)	$ 8,208	$ 2,108	$ 1,640	$ 778	$ 643	$ 2,684	$ 3,233	$ 5,740	$ 7,339	$ 10,963
shareholders' equity, related to the tax benefit arising from stock based compensation										(657)	(841)
income tax expense (benefit), including tax effect from exercise of stock options and vesting of other stock-based compensation awards									$ 5,740	$ 6,682	$ 10,122

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations, including tax effect from exercise of stock options and vesting of other stock-based compensation awards.

No definition available.

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- Definition

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
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907

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- References

No definition available.

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- Definition

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-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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