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Income Taxes - Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands		12 Months Ended
		Apr. 28, 2019	Apr. 29, 2018	Apr. 30, 2017
Income Tax Disclosure [Abstract]
beginning balance		$ 844	$ 12,245	$ 14,897
increases from prior period tax positions		135	350	854
decreases from prior period tax positions	[1]	(76)	(11,751)	(3,506)
ending balance		$ 903	$ 844	$ 12,245
[1] The $11.8 million reduction in our unrecognized income tax benefits during fiscal 2018 is mostly associated with the reduction in our U.S. Federal income tax rate pursuant to the Tax Act on the effective settlement of an IRS exam. The $3.5 million reduction in our unrecognized income tax benefits during fiscal 2017 was due to a lapse of applicable statute of limitations in a foreign jurisdiction.

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- Definition

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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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