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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jul. 28, 2018 | Jul. 29, 2017
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 223.4 | $ 201.2
Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 213.6 |
Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 9.8 |
UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 104.7 |
MALTA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 38.9 |
CHINA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 28.9 |
CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 20.8 |
EGYPT |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 12.7 |
BELGIUM |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 8.3 |
Other Countries [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 9.1 |
Automotive [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 175.3 | 156.5
Automotive [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 165.5 |
Automotive [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 9.8 |
Automotive [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 77.3 |
Automotive [Member] | MALTA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 30.5 |
Automotive [Member] | CHINA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 20.0 |
Automotive [Member] | CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 20.8 |
Automotive [Member] | EGYPT |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 12.7 |
Automotive [Member] | BELGIUM |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 8.3 |
Automotive [Member] | Other Countries [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 5.7 |
Interface |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 29.0 | 29.4
Interface | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 29.0 |
Interface | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Interface | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 19.4 |
Interface | MALTA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 6.1 |
Interface | CHINA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.1 |
Interface | CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Interface | EGYPT |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Interface | BELGIUM |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Interface | Other Countries [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 3.4 |
Power Products [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 18.8 | 15.2
Power Products [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 18.8 |
Power Products [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Power Products [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 7.7 |
Power Products [Member] | MALTA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 2.3 |
Power Products [Member] | CHINA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 8.8 |
Power Products [Member] | CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Power Products [Member] | EGYPT |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Power Products [Member] | BELGIUM |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Power Products [Member] | Other Countries [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Other Segments [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.3 | $ 0.1
Other Segments [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.3 |
Other Segments [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Other Segments [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.3 |
Other Segments [Member] | MALTA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Other Segments [Member] | CHINA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Other Segments [Member] | CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Other Segments [Member] | EGYPT |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Other Segments [Member] | BELGIUM |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 0.0 |
Other Segments [Member] | Other Countries [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 0.0 |

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