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Intangible Assets and Goodwill - Narrative - Goodwill Impairment Test (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016 | May 02, 2015
Goodwill [Line Items] |  |  |  |
Goodwill | $ 59.2 | $ 1.6 | $ 1.7 | $ 1.7
Goodwill impairment charge | 0.0 | 0.0 | 0.0 |
Interface |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 0.7 | 0.6 | 0.7 | $ 0.7
Goodwill impairment charge | 0.0 | $ 0.0 | $ 0.0 |
North American Automotive [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Reporting Unit, Fair Value | 708.5 |  |  |
Reporting Unit, Carrying Value | 215.3 |  |  |
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount | 493.2 |  |  |
European Automotive [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Reporting Unit, Fair Value | 386.5 |  |  |
Reporting Unit, Carrying Value | 302.1 |  |  |
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount | 84.4 |  |  |
Power Systems Group [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  | 135.00% |
Reporting Unit, Fair Value | 44.0 |  |  |
Reporting Unit, Carrying Value | 13.1 |  |  |
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount | 30.9 |  |  |
Hetronic [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  | 163.00% |
Reporting Unit, Fair Value | 77.5 |  |  |
Reporting Unit, Carrying Value | 32.0 |  |  |
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount | $ 45.5 |  |  |

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