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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($)	Jul. 29, 2018	Apr. 29, 2018	Jul. 30, 2017
Income Taxes [Line Items]
Unrecognized tax benefits	$ 820,000	$ 844,000	$ 12,400,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized	440,000	464,000	487,000
Non-current Deferred Income Taxes [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	380,000	380,000	11,900,000
Income Taxes Payable - Long-Term [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 440,000	$ 464,000	$ 487,000

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Income Taxes [Line Items]

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318

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-Section 50
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