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Income Taxes - Effective Income Tax Rate - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Income Tax Disclosure [Abstract]
Income taxes	$ 1,276	$ 2,108	$ 2,182	$ 3,748
Effective income tax rate			35.10%	29.10%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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X

- 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (h)
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-Publisher FASB
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