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Income Taxes - Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2017 | May 01, 2016 | May 03, 2015
Income Tax Disclosure [Abstract] |  |  |  |
beginning balance | $ 14,897 |  | $ 14,141 | $ 13,740
increases from prior period tax positions | 854 |  | 454 | 588
decreases from prior period tax positions | (3,506) | [1] | (77) | (187)
increases from current period tax positions |  |  | 379 |
ending balance | $ 12,245 |  | $ 14,897 | $ 14,141
[1] | Amount includes a reduction to unrecognized tax benefits of $3,431 resulting from a lapse of the applicable statute of limitations.

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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=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + 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=65882285&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=65882285&loc=SL6600010-109319 + Details
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