SEGMENT INFORMATION - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 28, 2018	Jul. 29, 2017
Segment Reporting Information [Line Items]
Net Sales to Unaffiliated Customers	$ 223.4	$ 201.2
Income (Loss) from Operations	28.7	25.4
Interest Expense (Income), Net	0.2	(0.2)
Other Expense, Net	0.3	0.8
Income before Income Taxes	28.2	24.8
Operating Segments
Segment Reporting Information [Line Items]
Net Sales	223.4	201.2
Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	0.0	0.0
Automotive
Segment Reporting Information [Line Items]
Net Sales to Unaffiliated Customers	175.3	156.5
Income (Loss) from Operations	32.9	35.8
Automotive | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	177.5	158.9
Automotive | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	(2.2)	(2.4)
Interface
Segment Reporting Information [Line Items]
Net Sales to Unaffiliated Customers	29.0	29.4
Income (Loss) from Operations	3.5	0.4
Interface | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	29.1	29.5
Interface | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	(0.1)	(0.1)
Power Products
Segment Reporting Information [Line Items]
Net Sales to Unaffiliated Customers	18.8	15.2
Income (Loss) from Operations	4.4	3.3
Power Products | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	18.9	15.2
Power Products | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	(0.1)	0.0
Other
Segment Reporting Information [Line Items]
Net Sales to Unaffiliated Customers	0.3	0.1
Income (Loss) from Operations	(2.1)	(2.7)
Other | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	0.3	0.1
Other | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	0.0	0.0
Eliminations/Corporate
Segment Reporting Information [Line Items]
Net Sales to Unaffiliated Customers	0.0	0.0
Income (Loss) from Operations	(10.0)	(11.4)
Eliminations/Corporate | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	(2.4)	(2.5)
Eliminations/Corporate | Transfers between Segments
Segment Reporting Information [Line Items]
Net Sales	$ 2.4	$ 2.5