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Acquisitions and Divestitures - Narrative - Fiscal 2014 Divestitures (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 10, 2014 USD ($) investment | Apr. 30, 2016 USD ($) | May 02, 2015 USD ($) | May 03, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |
Sale of investment |  | $ 1.6 | $ 11.2 | $ 6.1
Lumidigm |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of investments | investment | 1 |  |  |
Cost basis | $ 4.1 |  |  |
Sale of investment | 7.3 |  |  |
Pre-tax gain on sale of investment | $ 3.2 |  |  |
Amount held in escrow |  | $ 1.1 |  |

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