Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 27, 2019	Jul. 28, 2018
Segment Reporting Information [Line Items]
Net Sales	$ 270.2	$ 223.4
Income (Loss) from Operations	38.6	28.7
Interest Expense, Net	2.9	0.2
Other Expense, Net	0.1	0.3
Income before Income Taxes	35.6	28.2
Operating Segments
Segment Reporting Information [Line Items]
Net Sales	270.2	223.4
Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	0.0	0.0
Automotive
Segment Reporting Information [Line Items]
Net Sales	186.2	175.3
Income (Loss) from Operations	33.1	32.9
Automotive | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	187.5	177.5
Automotive | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	(1.3)	(2.2)
Industrial
Segment Reporting Information [Line Items]
Net Sales	70.8	32.2
Income (Loss) from Operations	16.5	7.1
Industrial | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	71.6	33.0
Industrial | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	(0.8)	(0.8)
Interface
Segment Reporting Information [Line Items]
Net Sales	12.9	15.6
Income (Loss) from Operations	0.2	0.8
Interface | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	12.9	15.7
Interface | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	0.0	(0.1)
Medical
Segment Reporting Information [Line Items]
Net Sales	0.3	0.3
Income (Loss) from Operations	(1.5)	(2.1)
Medical | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	0.3	0.3
Medical | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	0.0	0.0
Eliminations/Corporate
Segment Reporting Information [Line Items]
Net Sales	0.0	0.0
Income (Loss) from Operations	(9.7)	(10.0)
Eliminations/Corporate | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	(2.1)	(3.1)
Eliminations/Corporate | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	$ 2.1	$ 3.1