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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, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Current tax expense (benefit): |  |  |
Federal | $ 22,182 | $ 10,326 | $ (7,057)
State | 6,210 | 3,853 | 1,769
Current income tax expense (benefit) | 28,392 | 14,179 | (5,288)
Deferred tax expense (benefit) | 49,810 | 45,337 | (98,178)
Total income tax expense (benefit) | $ 78,202 | $ 59,516 | $ (103,466)

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