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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Apr. 28, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill Impairment Test [Table Text Block] |
|  | Fair Value of Reporting Unit |  | Carrying Value of Reporting Unit |  | Excess (Deficiency)
North American Automotive |  | $ | 708.5 |  |  | $ | 215.3 |  |  | $ | 493.2 |
European Automotive |  | $ | 386.5 |  |  | $ | 302.1 |  |  | $ | 84.4 |
Power Systems Group |  | $ | 44.0 |  |  | $ | 13.1 |  |  | $ | 30.9 |
Hetronic |  | $ | 77.5 |  |  | $ | 32.0 |  |  | $ | 45.5 |
Schedule of Goodwill Rollforward | The following table shows the roll-forward of goodwill.
|  | Automotive |  | Interface |  | Power Products |  | Total
Balance as of May 2, 2015 |  | $ | — |  |  | $ | 0.7 |  |  | $ | 1.0 |  |  | $ | 1.7 |
Goodwill Acquired |  | — |  |  | — |  |  | — |  |  | — |
Impairment |  | — |  |  | — |  |  | — |  |  | — |
Foreign Currency Translation |  | — |  |  | — |  |  | — |  |  | — |
Balance as of April 30, 2016 |  | — |  |  | 0.7 |  |  | 1.0 |  |  | 1.7 |
Goodwill Acquired |  | — |  |  | — |  |  | — |  |  | — |
Impairment |  | — |  |  | — |  |  | — |  |  | — |
Foreign Currency Translation |  | — |  |  | (0.1 | ) |  | — |  |  | (0.1 | )
Balance as of April 29, 2017 |  | — |  |  | 0.6 |  |  | 1.0 |  |  | 1.6 |
Goodwill Acquired |  | 57.2 |  |  | — |  |  | — |  |  | 57.2 |
Impairment |  | — |  |  | — |  |  | — |  |  | — |
Foreign Currency Translation |  | 0.3 |  |  | 0.1 |  |  | — |  |  | 0.4 |
Balance as of April 28, 2018 |  | $ | 57.5 |  |  | $ | 0.7 |  |  | $ | 1.0 |  |  | $ | 59.2 |
Schedule of Identifiable Intangible Assets | The following tables present details of the Company's identifiable intangible assets:
| As of April 28, 2018
| Gross |  | Accumulated Amortization |  | Net |  | Wtd. Avg. Remaining Amortization Periods (Years)
Customer Relationships and Agreements | $ | 64.4 |  |  | $ | 18.1 |  |  | $ | 46.3 |  |  | 12.3
Trade Names, Patents and Technology Licenses | 37.7 |  |  | 23.0 |  |  | 14.7 |  |  | 5.3
Total | $ | 102.1 |  |  | $ | 41.1 |  |  | $ | 61.0 |  |  |
| As of April 29, 2017
| Gross |  | Accumulated Amortization |  | Net |  | Wtd. Avg. Remaining Amortization Periods (Years)
Customer Relationships and Agreements | $ | 16.3 |  |  | $ | 15.6 |  |  | $ | 0.7 |  |  | 6.8
Trade Names, Patents and Technology Licenses | 25.8 |  |  | 19.9 |  |  | 5.9 |  |  | 1.4
Covenants Not to Compete | 0.1 |  |  | 0.1 |  |  | — |  |  | 0.4
Total | $ | 42.2 |  |  | $ | 35.6 |  |  | $ | 6.6 |  |  |
Schedule of Estimated Aggregate Amortization Expense | The estimated aggregate amortization expense for each of the five succeeding fiscal years is as follows:
2019 | $ | 7.5 |
2020 | $ | 5.5 |
2021 | $ | 5.4 |
2022 | $ | 5.4 |
2023 | $ | 5.4 |

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