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Revenue - Disaggregated Revenue (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
Disaggregation of Revenue [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
Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales									970.0
Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales									30.3
U.S.
Disaggregation of Revenue [Line Items]
Net Sales									540.5	487.5	506.9
Malta
Disaggregation of Revenue [Line Items]
Net Sales									148.5	184.0	155.5
China
Disaggregation of Revenue [Line Items]
Net Sales									113.7	117.3	127.7
Canada
Disaggregation of Revenue [Line Items]
Net Sales									101.6	54.4	0.0
Other
Disaggregation of Revenue [Line Items]
Net Sales									96.0	65.1	26.4
Automotive
Disaggregation of Revenue [Line Items]
Net Sales									734.7	728.7	632.2
Automotive | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales									704.4
Automotive | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales									30.3
Automotive | U.S.
Disaggregation of Revenue [Line Items]
Net Sales									373.0
Automotive | Malta
Disaggregation of Revenue [Line Items]
Net Sales									116.4
Automotive | China
Disaggregation of Revenue [Line Items]
Net Sales									78.2
Automotive | Canada
Disaggregation of Revenue [Line Items]
Net Sales									87.8
Automotive | Other
Disaggregation of Revenue [Line Items]
Net Sales									79.3
Industrial
Disaggregation of Revenue [Line Items]
Net Sales									206.8	105.8	92.3
Industrial | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales									206.8
Industrial | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales									0.0
Industrial | U.S.
Disaggregation of Revenue [Line Items]
Net Sales									110.3
Industrial | Malta
Disaggregation of Revenue [Line Items]
Net Sales									31.8
Industrial | China
Disaggregation of Revenue [Line Items]
Net Sales									35.3
Industrial | Canada
Disaggregation of Revenue [Line Items]
Net Sales									13.8
Industrial | Other
Disaggregation of Revenue [Line Items]
Net Sales									15.6
Interface
Disaggregation of Revenue [Line Items]
Net Sales									57.7	73.2	91.5
Interface | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales									57.7
Interface | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales									0.0
Interface | U.S.
Disaggregation of Revenue [Line Items]
Net Sales									56.1
Interface | Malta
Disaggregation of Revenue [Line Items]
Net Sales									0.3
Interface | China
Disaggregation of Revenue [Line Items]
Net Sales									0.2
Interface | Canada
Disaggregation of Revenue [Line Items]
Net Sales									0.0
Interface | Other
Disaggregation of Revenue [Line Items]
Net Sales									1.1
Medical
Disaggregation of Revenue [Line Items]
Net Sales									1.1	$ 0.3	$ 0.2
Medical | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales									1.1
Medical | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales									0.0
Medical | U.S.
Disaggregation of Revenue [Line Items]
Net Sales									1.1
Medical | Malta
Disaggregation of Revenue [Line Items]
Net Sales									0.0
Medical | China
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

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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