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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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May. 02, 2015 | May. 03, 2014 | Apr. 27, 2013
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Income tax at statutory rate | $ 42.2 | $ 26.5 | $ 13.3
State income taxes, net of federal benefit | 0.8 | 0.4 | 0.1
Foreign operations with lower statutory rates | (11.5) | (13.2) | (11.4)
Foreign losses with no tax benefit | 0.1 | 1.0 | 1.9
Foreign investment tax credit | (8.3) | 1.6 | (7.5)
Change in tax contingency reserve | 0.2 | 0.2 | (0.1)
Change in permanent reinvestment assertion | 0.3 | (2.8) | 0.0
Change in valuation allowance | (3.6) | (32.6) | (1.2)
Other, net | (0.4) | (1.4) | 2.4
Total income tax/(benefit) | $ 19.8 | $ (20.3) | $ (2.5)
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) | 0.60% | 0.50% | 0.30%
Foreign operations with lower statutory rates (as a percent) | (9.50%) | (17.40%) | (30.10%)
Foreign losses with no tax benefit (as a percent) | 0.10% | 1.30% | 5.00%
Foreign investment tax credit (as a percent) | (6.90%) | 2.10% | (19.80%)
Change in tax contingency reserve (as a percent) | 0.20% | 0.30% | (0.10%)
Change in permanent reinvestment assertion (as a percent) | 0.20% | (3.70%) | 0.00%
Change in valuation allowance (as a percent) | (3.00%) | (43.00%) | (3.30%)
Other, net (as a percent) | (0.30%) | (1.80%) | 6.40%
Income tax provision/(benefit) (as a percent) | 16.40% | (26.70%) | (6.60%)

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