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Income Taxes - Income Tax Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended
Jan. 27, 2018
Apr. 28, 2018
Jan. 27, 2018
Oct. 28, 2017
Jul. 29, 2017
Dec. 31, 2017
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Income tax at statutory rate (as a percent) 21.00%         35.00% 30.50% 35.00% 35.00%
Valuation allowance   $ 2.5         $ 2.5 $ 1.9  
Income taxes paid             20.2 19.0 $ 10.0
Provisions made for income taxes on undistributed net income of foreign operations   0.0         0.0    
Undistributed net income   306.6         306.6    
Gross unrecognized tax benefits   1.4         1.4 1.3  
Interest on income taxes accrued   0.1         0.1    
Income tax penalties accrued   0.0         0.0    
Income Tax Expense             $ 66.6 $ 23.0 $ 26.3
Income Taxes - Allowable Period to Pay Repatriation Tax             8 years    
Effective Income Tax Rate Reconciliation, U.S. Tax Reform, Percent             2.50%    
Internal Revenue Service (IRS) [Member]                  
Net operating loss carryforwards   2.1         $ 2.1    
Operating Loss Carryforwards, Potential Tax Benefit   0.4         0.4    
State                  
Net operating loss carryforwards   78.2         78.2    
Operating Loss Carryforwards, Potential Tax Benefit   5.2         5.2    
Foreign tax authority                  
Net operating loss carryforwards   0.3         0.3    
Operating Loss Carryforwards, Potential Tax Benefit   0.1         0.1    
Foreign tax authority | Malta | Investment Tax Credit Carryforward                  
Total unused credits   29.3         29.3    
Tax Credit Carryforward, Period, Indefinite | Foreign tax authority | Malta | Investment Tax Credit Carryforward                  
Total unused credits   27.6         27.6    
Tax Credit Carryforward, Period, 2020 Expiration | Foreign tax authority | Malta | Investment Tax Credit Carryforward                  
Total unused credits   1.7         1.7    
Total Impact of U.S. Tax Reform [Member]                  
Income Tax Expense   $ (3.1) $ 56.8 $ 0.0 $ 0.0   53.7    
Repatriation Tax [Member]                  
Income Tax Expense             48.5    
Re-measurement of Deferred Income Taxes [Member]                  
Income Tax Expense             $ 5.2