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SEGMENT INFORMATION - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 27, 2018	Oct. 28, 2017	Oct. 27, 2018	Oct. 28, 2017
Segment Reporting Information [Line Items]
Net Sales	$ 264.0	$ 230.1	$ 487.4	$ 431.3
Income (Loss) from Operations	19.1	29.7	47.8	55.1
Gain on Sale of Business	0.0
Interest Expense, Net	1.6	0.2	1.8	0.0
Other Expense (Income), Net	(0.1)	0.4	0.2	1.2
Income before Income Taxes	17.6	29.1	45.8	53.9
Operating Segments
Segment Reporting Information [Line Items]
Net Sales	264.0	230.1	487.4	431.3
Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	0.0	0.0	0.0	0.0
Automotive
Segment Reporting Information [Line Items]
Net Sales	201.6	186.7	376.9	343.2
Income (Loss) from Operations	36.8	42.9	69.7	78.7
Automotive | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	203.5	188.8	381.0	347.7
Automotive | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	(1.9)	(2.1)	(4.1)	(4.5)
Industrial
Segment Reporting Information [Line Items]
Net Sales	47.4	24.7	79.6	50.5
Income (Loss) from Operations	5.1	2.7	12.2	5.1
Industrial | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	47.9	24.6	80.9	50.2
Industrial | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	(0.5)	0.1	(1.3)	0.3
Interface
Segment Reporting Information [Line Items]
Net Sales	14.7	18.7	30.3	37.5
Income (Loss) from Operations	(0.6)	2.1	0.2	3.4
Interface | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	14.7	18.8	30.4	37.9
Interface | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	0.0	(0.1)	(0.1)	(0.4)
Medical
Segment Reporting Information [Line Items]
Net Sales	0.3	0.0	0.6	0.1
Income (Loss) from Operations	(2.5)	(3.1)	(4.6)	(5.8)
Medical | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	0.3	0.0	0.6	0.1
Medical | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	0.0	0.0	0.0	0.0
Eliminations/Corporate
Segment Reporting Information [Line Items]
Net Sales	0.0	0.0	0.0	0.0
Income (Loss) from Operations	(19.7)	(14.9)	(29.7)	(26.3)
Eliminations/Corporate | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	(2.4)	(2.1)	(5.5)	(4.6)
Eliminations/Corporate | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	$ 2.4	$ 2.1	$ 5.5	$ 4.6

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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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