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Material Customers - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Apr. 28, 2018 USD ($) | Apr. 29, 2017 USD ($) | Apr. 30, 2016
Minimum |  |  |
Revenue, Major Customer [Line Items] |  |  |
Accounts receivable - collection terms | 30 days |  |
Maximum |  |  |
Revenue, Major Customer [Line Items] |  |  |
Accounts receivable - collection terms | 60 days |  |
Automotive |  |  |
Revenue, Major Customer [Line Items] |  |  |
Number of significant customers | 2 |  |
Automotive | Customer 1 |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of consolidated net sales | 43.30% | 49.60% | 49.50%
Automotive | Customer 2 |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of consolidated net sales | 12.30% | 9.30% | 11.50%
Automotive | Material Customers [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Accounts receivable | $ 83.8 | $ 90.6 |
North American Automotive [Member] | Automotive | Material Customers [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Accounts receivable | $ 53.4 | $ 55.3 |

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