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Summary of Quarterly Results of Operations (Unaudited) - Summary of Unaudited Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ 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
Segment Reporting Information [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
Acquisition-related Expenses	0.1	3.8	10.9	0.6	0.0	0.0	4.2	2.6
Grant Income	(1.4)	(1.9)	(1.4)	(1.1)	(2.2)	(3.6)	(1.5)	0.0
Income Tax Expense									12.0	66.6	23.0
Foreign Investment Tax Credit	0.2	(0.7)	(1.1)	(0.4)	(8.7)	(0.3)	(0.4)	(0.4)	(2.0)	(9.8)	(4.7)
Expense for Initiatives to Reduce Overall Costs and Improve Operational Profitability	1.0	2.6	2.5	0.8
Net Tariff Expense	0.3	2.0	0.0	0.0
Gross Profit	70.6	64.3	70.8	60.1	61.9	60.1	62.0	55.6	265.8	239.6	218.3
Net Income	$ 22.6	$ 30.7	$ 14.6	$ 23.7	$ 36.8	$ (24.3)	$ 24.2	$ 20.5	91.6	57.2	$ 92.9
Net income per basic common share (in dollars per share)	$ 0.61	$ 0.82	$ 0.39	$ 0.63	$ 0.99	$ (0.65)	$ 0.65	$ 0.55
Net income per diluted common share (in dollars per share)	$ 0.60	$ 0.82	$ 0.39	$ 0.63	$ 0.98	$ (0.65)	$ 0.64	$ 0.55
RSAs | Executives and non-executive members of management | 2014 Incentive Plan
Segment Reporting Information [Line Items]
Allocated share-based compensation expense, amount recorded to true-up prior periods	$ 0.0	$ 0.0	$ 7.4	$ 0.0	$ 0.0	$ (6.0)	$ 0.0	$ 0.0	(7.4)	6.0
Total Impact of U.S. Tax Reform
Segment Reporting Information [Line Items]
Income Tax Expense	0.0	(4.8)	0.0	0.0	(3.1)	56.8	0.0	0.0	$ (4.8)	$ 53.7
Hetronic Lawsuit
Segment Reporting Information [Line Items]
Legal Fees	$ 0.8	$ 0.8	$ 1.0	$ 0.9	$ 2.1	$ 1.5	$ 1.6	$ 2.9

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