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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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