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Significant Accounting Policies - Narrative - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions | Apr. 28, 2018 | Apr. 30, 2017 | Apr. 29, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred Income Tax Assets, Net | $ 24.0 |  | $ 40.4
Accounting Standards Update 2016-09 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred Income Tax Assets, Net |  | $ 2.7 |

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