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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 26, 2019	Oct. 27, 2018	Oct. 26, 2019	Oct. 27, 2018
Disaggregation of Revenue [Line Items]
Net Sales	$ 257.2	$ 264.0	$ 527.4	$ 487.4
Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	245.8	256.0	508.8	469.6
Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales	11.4	8.0	18.6	17.8
U.S.
Disaggregation of Revenue [Line Items]
Net Sales	136.9	136.3	292.2	241.0
Malta
Disaggregation of Revenue [Line Items]
Net Sales	34.9	37.0	70.0	75.9
Canada
Disaggregation of Revenue [Line Items]
Net Sales	27.9	26.8	55.8	60.5
China
Disaggregation of Revenue [Line Items]
Net Sales	27.7	31.7	52.8	47.6
Other
Disaggregation of Revenue [Line Items]
Net Sales	29.8	32.2	56.6	62.4
Auto
Disaggregation of Revenue [Line Items]
Net Sales	180.1	201.6	366.3	376.9
Auto | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	168.7	193.6	347.7	359.1
Auto | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales	11.4	8.0	18.6	17.8
Auto | U.S.
Disaggregation of Revenue [Line Items]
Net Sales	84.2	96.7	184.2	174.0
Auto | Malta
Disaggregation of Revenue [Line Items]
Net Sales	27.2	29.6	54.7	60.1
Auto | Canada
Disaggregation of Revenue [Line Items]
Net Sales	22.6	24.3	44.1	42.5
Auto | China
Disaggregation of Revenue [Line Items]
Net Sales	20.7	22.5	36.3	45.1
Auto | Other
Disaggregation of Revenue [Line Items]
Net Sales	25.4	28.5	47.0	55.2
Industrial
Disaggregation of Revenue [Line Items]
Net Sales	64.9	47.4	135.7	79.6
Industrial | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	64.9	47.4	135.7	79.6
Industrial | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales	0.0	0.0	0.0	0.0
Industrial | U.S.
Disaggregation of Revenue [Line Items]
Net Sales	40.6	24.9	83.1	37.0
Industrial | Malta
Disaggregation of Revenue [Line Items]
Net Sales	7.6	7.4	15.1	15.7
Industrial | Canada
Disaggregation of Revenue [Line Items]
Net Sales	5.3	2.5	11.7	17.9
Industrial | China
Disaggregation of Revenue [Line Items]
Net Sales	7.0	9.1	16.5	2.5
Industrial | Other
Disaggregation of Revenue [Line Items]
Net Sales	4.4	3.5	9.3	6.5
Interface
Disaggregation of Revenue [Line Items]
Net Sales	11.9	14.7	24.8	30.3
Interface | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	11.9	14.7	24.8	30.3
Interface | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales	0.0	0.0	0.0	0.0
Interface | U.S.
Disaggregation of Revenue [Line Items]
Net Sales	11.8	14.4	24.3	29.4
Interface | Malta
Disaggregation of Revenue [Line Items]
Net Sales	0.1	0.0	0.2	0.1
Interface | Canada
Disaggregation of Revenue [Line Items]
Net Sales	0.0	0.0	0.0	0.1
Interface | China
Disaggregation of Revenue [Line Items]
Net Sales	0.0	0.1	0.0	0.0
Interface | Other
Disaggregation of Revenue [Line Items]
Net Sales	0.0	0.2	0.3	0.7
Medical
Disaggregation of Revenue [Line Items]
Net Sales	0.3	0.3	0.6	0.6
Medical | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	0.3	0.3	0.6	0.6
Medical | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales	0.0	0.0	0.0	0.0
Medical | U.S.
Disaggregation of Revenue [Line Items]
Net Sales	0.3	0.3	0.6	0.6
Medical | Malta
Disaggregation of Revenue [Line Items]
Net Sales	0.0	0.0	0.0	0.0
Medical | Canada
Disaggregation of Revenue [Line Items]
Net Sales	0.0	0.0	0.0	0.0
Medical | China
Disaggregation of Revenue [Line Items]
Net Sales	0.0	0.0	0.0	0.0
Medical | Other
Disaggregation of Revenue [Line Items]
Net Sales	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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