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Segment Information and Geographic Area Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May. 02, 2015 | Jan. 31, 2015 | Nov. 01, 2014 | Aug. 02, 2014 | May. 03, 2014 | Feb. 01, 2014 | Oct. 26, 2013 | Jul. 27, 2013 | May. 02, 2015 | May. 03, 2014 | Apr. 27, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 881.1 | $ 772.8 | $ 519.8
Transfers between segments |  |  |  |  |  |  |  |  | (881.1) | (772.8) | (519.8)
Net sales to unaffiliated customers | $ 227.3 | $ 206.0 | $ 229.7 | $ 218.1 | $ 224.8 | $ 189.8 | $ 190.9 | $ 167.3 | 881.1 | 772.8 | 519.8
Income/(loss) from operations |  |  |  |  |  |  |  |  | 112.2 | 73.6 | 39.2
Gain on sale of business |  |  |  |  |  |  |  |  | 7.7 | 0.0 | 0.0
Interest (income)/expense, net |  |  |  |  |  |  |  |  | (0.7) | 0.3 | 0.0
Other (income) expense, net |  |  |  |  |  |  |  |  | 0.2 | 2.6 | (1.3)
Income/(loss) before income taxes |  |  |  |  |  |  |  |  | 120.8 | 75.9 | 37.9
Depreciation and amortization |  |  |  |  |  |  |  |  | 23.4 | 25.6 | 18.8
Identifiable assets | 605.8 |  |  |  | 575.5 |  |  |  | 605.8 | 575.5 | 434.9
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Transfers between segments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Automotive |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 16.6 |  | 11.8
Identifiable assets | 365.5 |  |  |  |  |  |  |  | 365.5 |  | 277.5
Automotive | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 633.0 | 524.6 | 318.8
Transfers between segments |  |  |  |  |  |  |  |  | (633.0) | (524.6) | (318.8)
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 628.4 | 522.4 | 317.9
Income/(loss) from operations |  |  |  |  |  |  |  |  | 124.9 | 69.4 | 41.1
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 16.4 |
Identifiable assets |  |  |  |  | 366.1 |  |  |  |  | 366.1 |
Automotive | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4.6 | 2.2 | 0.9
Transfers between segments |  |  |  |  |  |  |  |  | (4.6) | (2.2) | (0.9)
Interface |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 2.8 |  | 3.0
Identifiable assets | 186.4 |  |  |  |  |  |  |  | 186.4 |  | 138.0
Interface | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 163.8 | 173.6 | 145.5
Transfers between segments |  |  |  |  |  |  |  |  | (163.8) | (173.6) | (145.5)
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 161.7 | 170.8 | 143.1
Income/(loss) from operations |  |  |  |  |  |  |  |  | 7.0 | 26.8 | 20.7
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2.9 |
Identifiable assets |  |  |  |  | 155.0 |  |  |  |  | 155.0 |
Interface | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2.1 | 2.8 | 2.4
Transfers between segments |  |  |  |  |  |  |  |  | (2.1) | (2.8) | (2.4)
Power Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 2.4 |  | 2.3
Identifiable assets | 38.5 |  |  |  |  |  |  |  | 38.5 |  | 28.6
Power Products | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 86.1 | 72.7 | 52.8
Transfers between segments |  |  |  |  |  |  |  |  | (86.1) | (72.7) | (52.8)
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 85.7 | 72.5 | 52.6
Income/(loss) from operations |  |  |  |  |  |  |  |  | 23.2 | 12.6 | 5.1
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2.4 |
Identifiable assets |  |  |  |  | 32.1 |  |  |  |  | 32.1 |
Power Products | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0.4 | 0.2 | 0.2
Transfers between segments |  |  |  |  |  |  |  |  | (0.4) | (0.2) | (0.2)
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.4 |  | 0.5
Identifiable assets | 3.7 |  |  |  |  |  |  |  | 3.7 |  | 6.7
Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 5.5 | 7.2 | 6.3
Transfers between segments |  |  |  |  |  |  |  |  | (5.5) | (7.2) | (6.3)
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 5.2 | 7.0 | 6.2
Income/(loss) from operations |  |  |  |  |  |  |  |  | (6.4) | (7.0) | (7.8)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2.5 |
Identifiable assets |  |  |  |  | 4.8 |  |  |  |  | 4.8 |
Other | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0.3 | 0.2 | 0.1
Transfers between segments |  |  |  |  |  |  |  |  | (0.3) | (0.2) | (0.1)
Eliminations/Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (7.3) | (5.3) | (3.6)
Transfers between segments |  |  |  |  |  |  |  |  | 7.3 | 5.3 | 3.6
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 0.1 | 0.1 | 0.0
Income/(loss) from operations |  |  |  |  |  |  |  |  | (36.5) | (28.2) | (19.9)
Depreciation and amortization |  |  |  |  |  |  |  |  | 1.2 | 1.4 | 1.2
Identifiable assets | $ 11.7 |  |  |  | $ 17.5 |  |  |  | 11.7 | 17.5 | (15.9)
Eliminations/Corporate | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (7.4) | (5.4) | (3.6)
Transfers between segments |  |  |  |  |  |  |  |  | $ 7.4 | $ 5.4 | $ 3.6

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