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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	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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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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