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Income Taxes - Deferred Income Taxes - Undistributed Earnings from Foreign Subsidiaries - Narrative (Detail) - USD ($)		12 Months Ended
	Jul. 30, 2017	Apr. 28, 2019	Jul. 29, 2018	Apr. 29, 2018
Income Taxes [Line Items]
Deferred tax liability, undistributed earnings from foreign subsidiaries	$ 810,000		$ 2,800,000	$ 4,300,000
U.S. income and foreign withholding taxes	45,400,000
U.S. foreign income tax credits	$ 44,600,000
Scenario, Forecast [Member]
Income Taxes [Line Items]
Dividends received deduction percentage for earnings and profits received from foreign corporation		100.00%
Dividends received deduction, foreign corporation ownership percentage		10.00%

X

- Definition

Deferred tax liabilities arising from domestic income taxes and foreign withholding taxes as determined by applying the provisions of applicable enacted law to domestic and foreign countries.

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- Definition

The ownership percentage of a foreign corporation under the dividends received deduction.

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- Definition

The deductible percentage of dividends received from a partially owned foreign corporation.

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Income Taxes [Line Items]

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319

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-Topic 740
-SubTopic 10
-Section 25
-Paragraph 20
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A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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