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Organization and Significant Accounting Policies - Recently Adopted Accounting Standards (Details) - USD ($) | Jul. 27, 2019 | May 01, 2019 | Apr. 30, 2019
--- | --- | --- | ---
Revenue recognition |  |  |
Retained earnings | $ 304,126,000 |  | $ 286,351,000
ASU 2014-09 | Effect of the Adoption of ASC Topic 606 |  |  |
Revenue recognition |  |  |
Retained earnings, continuing operations |  | $ 665,000 |

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