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Schedule of Effective Tax Rates Vary from Federal Statutory Rates (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Earnings Before Income Taxes	$ 45,218	$ (148,565)	$ 94,210	$ 54,861	$ (171,597)	$ 74,518	$ 91,793	$ 85,021	$ 45,724	$ 79,735	$ 271,962
Income Taxes at Statutory Rate									9,602	16,744	85,804
Increases (Decreases) in Tax Resulting from - State Income Taxes, net									(1,703)	(629)	6,139
Increases (Decreases) in Tax Resulting from - Statutory Depletion in Excess of Cost									(3,078)	(3,834)	(6,341)
Increases (Decreases) in Tax Resulting from - Domestic Production Activities Deduction											(5,995)
Increases (Decreases) in Tax Resulting from - Excess Tax Benefit from Stock Compensation									307	(651)	(4,129)
Increases (Decreases) in Tax Resulting from - Meals and Entertainment Disallowance									537	610	567
Increases (Decreases) in Tax Resulting from - Limitation on Officer's Compensation									1,018	1,434	246
Increases (Decreases) in Tax Resulting from - Impact of Tax Cuts and Jobs Act of 2017											(61,692)
Increase (Decreases in Tax Resulting from -Impact of CARES Act of 2020									(35,936)
Increases (Decreases) in Tax Resulting from - Credits									(2,150)	(940)
Increases (Decreases) in Tax Resulting from - Valuation Allowance									2,212	(2,100)
Increases (Decreases) in Tax Resulting from - Unrecognized Tax Benefits									4,200
Increases (Decreases) in Tax Resulting from - Other									(179)	241	731
Provision (Benefit) for Income Taxes									$ (25,170)	$ 10,875	$ 15,330
Effective Tax Rate									(55.00%)	14.00%	6.00%

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