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Income Taxes - 2017 Tax Cuts and Jobs Act - Narrative (Detail)	3 Months Ended		12 Months Ended
	Jul. 29, 2018	Jul. 30, 2017	Apr. 28, 2019	Apr. 29, 2018
Income Taxes [Line Items]
Federal statutory income tax rate	21.00%	34.00%		30.40%
Scenario, Forecast [Member]
Income Taxes [Line Items]
Federal statutory income tax rate			21.00%

X

- Definition

Income Taxes [Line Items]

+ References

No definition available.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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