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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 |  |

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