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Revenue - Impact of Adoption (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	Apr. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017	Apr. 29, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales	$ 266.0	$ 246.9	$ 264.0	$ 223.4	$ 249.0	$ 228.0	$ 230.1	$ 201.2	$ 1,000.3	$ 908.3	$ 816.5
Cost of Products Sold									734.5	668.7	$ 598.2
Inventories	116.7				84.1				116.7	84.1
Contract Assets	0.8								0.8			$ 0.8
Contract Liabilities	0.3								0.3			$ 0.2
Retained Earnings	545.2				$ 472.0				545.2	$ 472.0
Adjustments | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales									(24.2)
Cost of Products Sold									(24.2)
Inventories	(0.5)								(0.5)
Contract Assets	0.8								0.8
Contract Liabilities	0.3								0.3
Retained Earnings	0.1								0.1
Balance Under ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales									1,024.5
Cost of Products Sold									758.7
Inventories	117.2								117.2
Contract Assets	0.0								0.0
Contract Liabilities	0.0								0.0
Retained Earnings	$ 545.1								$ 545.1

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