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Income Taxes - Schedule of Reconciliation of Consolidated Provisions for Income Taxes from Continuing Operations (Details) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2016 | May 02, 2015 | May 03, 2014
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Income tax at statutory rate | $ 38.9 | $ 42.2 | $ 26.5
State income taxes, net of federal benefit | 0.4 | 0.8 | 0.4
Foreign operations with lower statutory rates | (11.9) | (11.5) | (13.2)
Foreign losses with no tax benefit | 0.0 | 0.1 | 1.0
Foreign investment tax credit | (2.1) | (8.3) | 1.6
Change in tax contingency reserve | 0.1 | 0.2 | 0.2
Change in permanent reinvestment assertion | 0.0 | 0.3 | (2.8)
Change in valuation allowance | 0.1 | (3.6) | (32.6)
Other, net | 0.8 | (0.4) | (1.4)
Total income tax/(benefit) | $ 26.3 | $ 19.8 | $ (20.3)
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |
Income tax at statutory rate (as a percent) | 35.00% | 35.00% | 35.00%
State income taxes, net of federal benefit (as a percent) | 0.40% | 0.60% | 0.50%
Foreign operations with lower statutory rates (as a percent) | (10.70%) | (9.50%) | (17.40%)
Foreign losses with no tax benefit (as a percent) | 0.00% | 0.10% | 1.30%
Foreign investment tax credit (as a percent) | (1.90%) | (6.90%) | 2.10%
Change in tax contingency reserve (as a percent) | 0.10% | 0.20% | 0.30%
Change in permanent reinvestment assertion (as a percent) | 0.00% | 0.20% | (3.70%)
Change in valuation allowance (as a percent) | 0.10% | (3.00%) | (43.00%)
Other, net (as a percent) | 0.80% | (0.30%) | (1.80%)
Income tax provision/(benefit) (as a percent) | 23.70% | 16.40% | (26.70%)

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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