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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. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Segment Reporting Information [Line Items]
Net Sales									$ 908.3	$ 816.5	$ 809.1
Net Sales to Unaffiliated Customers	$ 249.0	$ 228.0	$ 230.1	$ 201.2	$ 219.7	$ 195.6	$ 209.3	$ 191.9	908.3	816.5	809.1
Income/(Loss) from Operations									118.3	110.8	109.7
Interest (Income) Expense, Net									0.9	(0.4)	(0.7)
Other Income, Net									(6.4)	(4.7)	(0.5)
Income before Income Taxes									123.8	115.9	110.9
Depreciation and Amortization									28.1	24.3	23.9
Identifiable Assets	915.9				704.0				915.9	704.0	655.9
Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									0.0	0.0	0.0
Automotive
Segment Reporting Information [Line Items]
Income/(Loss) from Operations									156.3
Depreciation and Amortization									21.3		15.6
Identifiable Assets	632.7								632.7		418.4
Automotive | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									738.4	641.0	623.1
Net Sales to Unaffiliated Customers									728.7	632.2	614.3
Income/(Loss) from Operations										148.3	136.8
Depreciation and Amortization										15.5
Identifiable Assets					462.3					462.3
Automotive | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									(9.7)	(8.8)	(8.8)
Interface
Segment Reporting Information [Line Items]
Income/(Loss) from Operations									5.0
Depreciation and Amortization									3.5		4.3
Identifiable Assets	251.4								251.4		184.8
Interface | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									116.1	128.2	142.6
Net Sales to Unaffiliated Customers									115.8	127.4	140.8
Income/(Loss) from Operations										(0.9)	2.7
Depreciation and Amortization										4.2
Identifiable Assets					202.5					202.5
Interface | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									(0.3)	(0.8)	(1.8)
Power Products
Segment Reporting Information [Line Items]
Income/(Loss) from Operations									14.0
Depreciation and Amortization									1.6		2.3
Identifiable Assets	48.5								48.5		46.4
Power Products | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									63.4	56.5	54.1
Net Sales to Unaffiliated Customers									63.2	56.3	53.5
Income/(Loss) from Operations										11.5	9.4
Depreciation and Amortization										2.8
Identifiable Assets					46.2					46.2
Power Products | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									(0.2)	(0.2)	(0.6)
Other
Segment Reporting Information [Line Items]
Income/(Loss) from Operations									(11.4)
Depreciation and Amortization									0.8		0.6
Identifiable Assets	8.1								8.1		5.0
Other | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									0.3	2.2	0.6
Net Sales to Unaffiliated Customers									0.3	0.3	0.3
Income/(Loss) from Operations										(12.4)	(8.8)
Depreciation and Amortization										1.0
Identifiable Assets					5.2					5.2
Other | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									0.0	(1.9)	(0.3)
Eliminations/Corporate
Segment Reporting Information [Line Items]
Net Sales											(11.3)
Net Sales to Unaffiliated Customers									0.3	0.3	0.2
Income/(Loss) from Operations									(45.6)	(35.7)	(30.4)
Depreciation and Amortization									0.9	0.8	1.1
Identifiable Assets	$ (24.8)				$ (12.2)				(24.8)	(12.2)	1.3
Eliminations/Corporate | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									(9.9)	(11.4)
Eliminations/Corporate | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									$ 10.2	$ 11.7	$ 11.5

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