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Material Customers - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2016 USD ($) customer | May 02, 2015 USD ($) customer | May 03, 2014 customer
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 | customer | 2 | 2 | 2
Accounts receivable | $ 90.0 | $ 83.6 |
Automotive | Maltese subsidiary |  |  |
Revenue, Major Customer [Line Items] |  |  |
Accounts receivable | $ 51.4 | $ 55.1 |
Automotive | Customer 1 |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of consolidated net sales | 49.50% | 44.80% | 36.40%
Automotive | Customer 2 |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of consolidated net sales | 11.50% | 12.80% | 14.50%

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