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SEGMENT INFORMATION - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Oct. 31, 2015
Nov. 01, 2014
Segment Reporting Information [Line Items]        
Net sales to unaffiliated customers $ 208.4 $ 229.7 $ 411.7 $ 447.8
Income (loss) from operations 26.4 34.8 56.9 63.0
Interest income, net (0.3) (0.1) (0.5) (0.2)
Other income, net (0.2) 0.2 (0.5) 0.1
Income before income taxes 26.9 34.7 57.9 63.1
Operating Segments        
Segment Reporting Information [Line Items]        
Net sales (208.4) (229.7) (411.7) (447.8)
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 to unaffiliated customers 160.8 165.9 313.8 322.3
Income (loss) from operations 35.1 35.0 71.1 62.7
Automotive | Operating Segments        
Segment Reporting Information [Line Items]        
Net sales (163.1) (167.1) (317.9) (323.9)
Automotive | Transfers between segments        
Segment Reporting Information [Line Items]        
Net sales (2.3) (1.2) (4.1) (1.6)
Interface        
Segment Reporting Information [Line Items]        
Net sales to unaffiliated customers 35.8 40.6 69.6 84.5
Income (loss) from operations 1.4 4.8 2.1 11.9
Interface | Operating Segments        
Segment Reporting Information [Line Items]        
Net sales (36.0) (41.1) (70.1) (85.6)
Interface | Transfers between segments        
Segment Reporting Information [Line Items]        
Net sales (0.2) (0.5) (0.5) (1.1)
Power Products        
Segment Reporting Information [Line Items]        
Net sales to unaffiliated customers 11.8 21.6 28.3 37.8
Income (loss) from operations 0.5 5.6 3.5 8.6
Power Products | Operating Segments        
Segment Reporting Information [Line Items]        
Net sales (11.8) (21.7) (28.3) (38.0)
Power Products | Transfers between segments        
Segment Reporting Information [Line Items]        
Net sales 0.0 (0.1) 0.0 (0.2)
Other        
Segment Reporting Information [Line Items]        
Net sales to unaffiliated customers 0.0 1.6 0.0 3.3
Income (loss) from operations (1.9) (1.0) (4.1) (3.1)
Other | Operating Segments        
Segment Reporting Information [Line Items]        
Net sales 0.0 (1.7) (0.1) (3.4)
Other | Transfers between segments        
Segment Reporting Information [Line Items]        
Net sales 0.0 (0.1) (0.1) (0.1)
Eliminations/Corporate        
Segment Reporting Information [Line Items]        
Net sales to unaffiliated customers 0.0 0.0 0.0 (0.1)
Income (loss) from operations (8.7) (9.6) (15.7) (17.1)
Eliminations/Corporate | Operating Segments        
Segment Reporting Information [Line Items]        
Net sales 2.5 1.9 4.7 3.1
Eliminations/Corporate | Transfers between segments        
Segment Reporting Information [Line Items]        
Net sales $ 2.5 $ 1.9 $ 4.7 $ 3.0