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Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands | Jul. 31, 2018 | Apr. 30, 2018
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Shareholders' equity | $ 1,298,699 | $ 1,271,141
Deferred income taxes | $ (349,656) | (341,946)
GIft Cards | Accounting Standards Update 2014-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Shareholders' equity |  | 879
Deferred revenue |  | (879)
Deferred income taxes |  | (321)
Box Tops | Accounting Standards Update 2014-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Shareholders' equity |  | (5,019)
Deferred revenue |  | 5,019
Deferred income taxes |  | $ 1,816

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