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Income Taxes - Schedule of Reconciliation of Consolidated Provisions for Income Taxes from Continuing Operations (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 Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |  |  |  |  |  |
Income Tax at Statutory Rate |  |  |  |  |  |  | $ 37.7 | $ 40.5 | $ 38.9
State Income Taxes, Net of Federal Benefit |  |  |  |  |  |  | 0.1 | 0.9 | 0.4
Foreign Operations with Lower Statutory Rates |  |  |  |  |  |  | (15.3) | (14.5) | (11.9)
Foreign Investment Tax Credit |  | $ (8.7) | $ (0.3) | $ (0.4) | $ (0.4) |  | (9.8) | (4.7) | (2.1)
Change in Tax Reserve |  |  |  |  |  |  | 0.1 | 0.1 | 0.1
Change in Valuation Allowance |  |  |  |  |  |  | 0.4 | 0.3 | 0.1
Other, Net |  |  |  |  |  |  | 1.2 | 0.4 | 0.8
Total Income Tax Expense |  |  |  |  |  |  | $ 66.6 | $ 23.0 | $ 26.3
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |  |  |  |  |  |  |
Income tax at statutory rate (as a percent) | 21.00% |  |  |  |  | 35.00% | 30.50% | 35.00% | 35.00%
State income taxes, net of federal benefit (as a percent) |  |  |  |  |  |  | 0.10% | 0.80% | 0.40%
Foreign operations with lower statutory rates (as a percent) |  |  |  |  |  |  | (12.40%) | (12.50%) | (10.70%)
Foreign investment tax credit (as a percent) |  |  |  |  |  |  | (7.90%) | (4.10%) | (1.90%)
Change in tax contingency reserve (as a percent) |  |  |  |  |  |  | 0.00% | 0.10% | 0.10%
Change in valuation allowance (as a percent) |  |  |  |  |  |  | 0.30% | 0.30% | 0.10%
Other, net (as a percent) |  |  |  |  |  |  | 1.00% | 0.30% | 0.80%
Income tax provision/(benefit) (as a percent) |  |  |  |  |  |  | 53.80% | 19.90% | 23.80%
Effective Income Tax Rate Reconciliation, Tax Rate Change, Foreign, Amount |  |  |  |  |  |  | $ (1.5) | $ 0.0 | $ 0.0
Effective Income Tax Rate Reconciliation, Tax Rate Change, Foreign, Percent |  |  |  |  |  |  | (1.20%) | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation, U.S. Tax Reform Re-measurements, Amount |  |  |  |  |  |  | $ 5.2 | $ 0.0 | $ 0.0
Effective Income Tax Rate Reconciliation, U.S. Tax Reform Re-measurements, Percent |  |  |  |  |  |  | 4.20% | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation, U.S. Tax Reform Repatriation, Amount |  |  |  |  |  |  | $ 48.5 | $ 0.0 | $ 0.0
Effective Income Tax Rate Reconciliation, U.S. Tax Reform Repatriation, Percent |  |  |  |  |  |  | 39.20% | 0.00% | 0.00%

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