Segment Information and Geographic Area Information - Schedule of Segment Reporting Information, by Segment (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
Segment Reporting Information [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
Income/(Loss) from Operations									147.1	106.8	118.3
Interest Expense, Net									10.1	8.3	0.9
Other Income, Net									(11.7)	(5.1)	(6.4)
Income before Income Taxes									148.7	103.6	123.8
Purchases of Property, Plant and Equipment									45.1	49.8	47.7
Depreciation and Amortization									48.3	43.3	28.1
Identifiable Assets	1,370.6				1,231.7				1,370.6	1,231.7	915.9
Operating Segments
Segment Reporting Information [Line Items]
Net Sales									1,023.9	1,000.3	908.3
Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									0.0	0.0	0.0
Automotive
Segment Reporting Information [Line Items]
Net Sales									712.1	734.7	728.7
Income/(Loss) from Operations									124.4	126.3	156.3
Interest Expense, Net									0.0	0.0	0.0
Other Income, Net									0.0	0.0	0.0
Income before Income Taxes									0.0	0.0	0.0
Purchases of Property, Plant and Equipment									37.5	38.9	31.7
Depreciation and Amortization									31.0	25.2	21.3
Identifiable Assets	670.9				677.4				670.9	677.4	632.7
Automotive | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									716.8	741.6	738.4
Automotive | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									(4.7)	(6.9)	(9.7)
Industrial
Segment Reporting Information [Line Items]
Net Sales									251.4	206.8	105.8
Income/(Loss) from Operations									59.4	37.4	13.0
Interest Expense, Net									0.0	0.0	0.0
Other Income, Net									0.0	0.0	0.0
Income before Income Taxes									0.0	0.0	0.0
Purchases of Property, Plant and Equipment									5.7	2.6	1.5
Depreciation and Amortization									13.7	11.7	2.0
Identifiable Assets	421.8				404.3				421.8	404.3	93.1
Industrial | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									253.9	210.0	105.6
Industrial | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									(2.5)	(3.2)	0.2
Interface
Segment Reporting Information [Line Items]
Net Sales									58.8	57.7	73.2
Income/(Loss) from Operations									5.6	(0.3)	6.0
Interest Expense, Net									0.0	0.0	0.0
Other Income, Net									0.0	0.0	0.0
Income before Income Taxes									0.0	0.0	0.0
Purchases of Property, Plant and Equipment									0.3	0.5	0.4
Depreciation and Amortization									0.9	3.2	3.1
Identifiable Assets	71.0				88.6				71.0	88.6	206.8
Interface | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									58.9	57.9	73.9
Interface | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									(0.1)	(0.2)	(0.7)
Medical
Segment Reporting Information [Line Items]
Net Sales									1.6	1.1	0.3
Income/(Loss) from Operations									(6.0)	(8.6)	(11.4)
Interest Expense, Net									0.0	0.0	0.0
Other Income, Net									0.0	0.0	0.0
Income before Income Taxes									0.0	0.0	0.0
Purchases of Property, Plant and Equipment									0.7	1.9	3.8
Depreciation and Amortization									1.1	1.0	0.8
Identifiable Assets	8.8				9.4				8.8	9.4	8.1
Medical | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									1.6	1.1	0.3
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	0.0	0.3
Income/(Loss) from Operations									(36.3)	(48.0)	(45.6)
Interest Expense, Net									0.0	0.0	0.0
Other Income, Net									0.0	0.0	0.0
Income before Income Taxes									0.0	0.0	0.0
Purchases of Property, Plant and Equipment									0.9	5.9	10.3
Depreciation and Amortization									1.6	2.2	0.9
Identifiable Assets	$ 198.1				$ 52.0				198.1	52.0	(24.8)
Eliminations/Corporate | Operating Segments
Segment Reporting Information [Line Items]
Net Sales									(7.3)	(10.3)	(9.9)
Eliminations/Corporate | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales									$ 7.3	$ 10.3	$ 10.2