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Segment Information and Geographic Area Information - Schedule of Segment Reporting Information, by Segment (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
Segment Reporting Information [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
Income/(Loss) from Operations									106.8	118.3	110.8
Interest (Income) Expense, Net									8.3	0.9	(0.4)
Other Income, Net									(5.1)	(6.4)	(4.7)
Income before Income Taxes									103.6	123.8	115.9
Depreciation and Amortization									43.3	28.1	24.3
Identifiable Assets	1,231.7				915.9				1,231.7	915.9	704.0
Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									0.0	0.0	0.0
Automotive
Segment Reporting Information [Line Items]
Net Sales									734.7	728.7	632.2
Income/(Loss) from Operations									126.3	156.3	148.3
Depreciation and Amortization									25.2	21.3	15.5
Identifiable Assets	677.4				632.7				677.4	632.7	462.3
Automotive | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									741.6	738.4	641.0
Automotive | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									(6.9)	(9.7)	(8.8)
Industrial
Segment Reporting Information [Line Items]
Net Sales									206.8	105.8	92.3
Income/(Loss) from Operations									37.4	13.0	2.7
Depreciation and Amortization									11.7	2.0	3.2
Identifiable Assets	404.3				93.1				404.3	93.1	78.1
Industrial | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									210.0	105.6	92.4
Industrial | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									(3.2)	0.2	(0.1)
Interface
Segment Reporting Information [Line Items]
Net Sales									57.7	73.2	91.5
Income/(Loss) from Operations									(0.3)	6.0	4.0
Depreciation and Amortization									3.2	3.1	4.3
Identifiable Assets	88.6				206.8				88.6	206.8	170.4
Interface | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									57.9	73.9	94.3
Interface | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									(0.2)	(0.7)	(2.8)
Medical
Segment Reporting Information [Line Items]
Net Sales									1.1	0.3	0.2
Income/(Loss) from Operations									(8.6)	(11.4)	(8.5)
Depreciation and Amortization									1.0	0.8	0.5
Identifiable Assets	9.4				8.1				9.4	8.1	5.4
Medical | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									1.1	0.3	0.2
Medical | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									0.0	0.0	0.0
Eliminations/Corporate
Segment Reporting Information [Line Items]
Net Sales									0.0	0.3	0.3
Income/(Loss) from Operations									(48.0)	(45.6)	(35.7)
Depreciation and Amortization									2.2	0.9	0.8
Identifiable Assets	$ 52.0				$ (24.8)				52.0	(24.8)	(12.2)
Eliminations/Corporate | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									(10.3)	(9.9)	(11.4)
Eliminations/Corporate | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									$ 10.3	$ 10.2	$ 11.7

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