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Income Taxes - Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 29, 2018 | Apr. 30, 2017 | May 01, 2016
Income Tax Disclosure [Abstract] |  |  |  |
beginning balance |  | $ 12,245 | $ 14,897 | $ 14,141
increases from prior period tax positions |  | 350 | 854 | 454
decreases from prior period tax positions | [1] | (11,751) | (3,506) | (77)
increases from current period tax positions |  |  |  | 379
ending balance |  | $ 844 | $ 12,245 | $ 14,897
[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 on an IRS exam. The $3.5 million reduction in our unrecognized income tax benefits during fiscal 2017 is 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/presentationRef -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 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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