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Segment Information and Geographic Area Information - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (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
Revenues from External Customers and Long-Lived Assets [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
Property, plant and equipment	191.9				162.2				191.9	162.2	90.6
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									540.5	487.5	506.9
Property, plant and equipment	83.9				63.3				83.9	63.3	44.9
Malta
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									148.5	184.0	155.5
Property, plant and equipment	33.0				36.8				33.0	36.8	26.4
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									113.7	117.3	127.7
Property, plant and equipment	18.6				7.2				18.6	7.2	5.9
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									101.6	54.4	0.0
Belgium
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	22.1				25.0				22.1	25.0	0.0
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									96.0	65.1	26.4
Property, plant and equipment	$ 34.3				$ 29.9				$ 34.3	$ 29.9	$ 13.4

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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