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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
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%)