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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Current tax expense (benefit): |  |  |
Federal | $ 10,326 | $ (7,057) | $ 41,300
State | 3,853 | 1,769 | 5,693
Current income tax expense (benefit) | 14,179 | (5,288) | 46,993
Deferred tax expense (benefit) | 45,337 | (98,178) | 45,190
Total income tax expense (benefit) | $ 59,516 | $ (103,466) | $ 92,183

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