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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

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