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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
	May 02, 2020	Feb. 01, 2020	Oct. 26, 2019	Jul. 27, 2019	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	May 02, 2020	Apr. 27, 2019	Apr. 28, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 210.6	$ 285.9	$ 257.2	$ 270.2	$ 266.0	$ 246.9	$ 264.0	$ 223.4	$ 1,023.9	$ 1,000.3	$ 908.3
Total Tangible Long-lived Assets, Net	225.4				191.9				225.4	191.9
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									531.5	540.5	487.5
Total Tangible Long-lived Assets, Net	89.8				83.9				89.8	83.9
Malta
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									143.9	148.5	184.0
Total Tangible Long-lived Assets, Net	40.1				33.0				40.1	33.0
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									116.9	113.7	117.3
Total Tangible Long-lived Assets, Net	24.1				18.6				24.1	18.6
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									104.7	0.0	0.0
Total Tangible Long-lived Assets, Net	24.0				9.2				24.0	9.2
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									19.5	101.6	54.4
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									107.4	96.0	$ 65.1
Belgium
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Tangible Long-lived Assets, Net	21.4				22.1				21.4	22.1
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									126.9	96.0
Total Tangible Long-lived Assets, Net	$ 26.0				$ 25.1				$ 26.0	$ 25.1