Revenue - Disaggregation of Revenue (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
Disaggregation of Revenue [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
Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales									987.2	970.0
Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales									36.7	30.3
U.S.
Disaggregation of Revenue [Line Items]
Net Sales									531.5	540.5	487.5
Malta
Disaggregation of Revenue [Line Items]
Net Sales									143.9	148.5	184.0
China
Disaggregation of Revenue [Line Items]
Net Sales									116.9	113.7	117.3
Mexico
Disaggregation of Revenue [Line Items]
Net Sales									104.7	0.0	0.0
CANADA
Disaggregation of Revenue [Line Items]
Net Sales									19.5	101.6	54.4
Other
Disaggregation of Revenue [Line Items]
Net Sales									126.9	96.0
Auto
Disaggregation of Revenue [Line Items]
Net Sales									712.1	734.7	728.7
Auto | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales									675.4	704.4
Auto | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales									36.7	30.3
Auto | U.S.
Disaggregation of Revenue [Line Items]
Net Sales									330.9	373.0
Auto | Malta
Disaggregation of Revenue [Line Items]
Net Sales									113.2	116.4
Auto | China
Disaggregation of Revenue [Line Items]
Net Sales									74.4	78.2
Auto | Mexico
Disaggregation of Revenue [Line Items]
Net Sales									104.7
Auto | CANADA
Disaggregation of Revenue [Line Items]
Net Sales										87.8
Auto | Other
Disaggregation of Revenue [Line Items]
Net Sales									88.9	79.3
Industrial
Disaggregation of Revenue [Line Items]
Net Sales									251.4	206.8	105.8
Industrial | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales									251.4	206.8
Industrial | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales									0.0	0.0
Industrial | U.S.
Disaggregation of Revenue [Line Items]
Net Sales									141.1	110.3
Industrial | Malta
Disaggregation of Revenue [Line Items]
Net Sales									30.4	31.8
Industrial | China
Disaggregation of Revenue [Line Items]
Net Sales									42.4	35.3
Industrial | Mexico
Disaggregation of Revenue [Line Items]
Net Sales									0.0
Industrial | CANADA
Disaggregation of Revenue [Line Items]
Net Sales										13.8
Industrial | Other
Disaggregation of Revenue [Line Items]
Net Sales									37.5	15.6
Interface
Disaggregation of Revenue [Line Items]
Net Sales									58.8	57.7	73.2
Interface | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales									58.8	57.7
Interface | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales									0.0	0.0
Interface | U.S.
Disaggregation of Revenue [Line Items]
Net Sales									57.9	56.1
Interface | Malta
Disaggregation of Revenue [Line Items]
Net Sales									0.3	0.3
Interface | China
Disaggregation of Revenue [Line Items]
Net Sales									0.1	0.2
Interface | Mexico
Disaggregation of Revenue [Line Items]
Net Sales									0.0
Interface | CANADA
Disaggregation of Revenue [Line Items]
Net Sales										0.0
Interface | Other
Disaggregation of Revenue [Line Items]
Net Sales									0.5	1.1
Medical
Disaggregation of Revenue [Line Items]
Net Sales									1.6	1.1	$ 0.3
Medical | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales									1.6	1.1
Medical | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales									0.0	0.0
Medical | U.S.
Disaggregation of Revenue [Line Items]
Net Sales									1.6	1.1
Medical | Malta
Disaggregation of Revenue [Line Items]
Net Sales									0.0	0.0
Medical | China
Disaggregation of Revenue [Line Items]
Net Sales									0.0	0.0
Medical | Mexico
Disaggregation of Revenue [Line Items]
Net Sales									0.0
Medical | CANADA
Disaggregation of Revenue [Line Items]
Net Sales										0.0
Medical | Other
Disaggregation of Revenue [Line Items]
Net Sales									$ 0.0	$ 0.0