Fair Value of Financial Instruments - Fair Value of Commodity Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Derivative assets (liabilities)
Net commodity derivative asset	$ 33,801	$ 15,704
Prepaid expenses and other current assets
Derivative assets (liabilities)
Net commodity derivative asset	33,500
Commodity contracts
Assets:
Derivative assets	73,470	49,832
Netting of counterparty contracts, assets	(13,550)	(12,648)
Net cash collateral (held) provided	(5,755)	2,660
Commodity derivatives	54,165	39,844
Liabilities:
Derivative liabilities	(33,914)	(42,331)
Netting of counterparty contracts, liabilities	13,550	12,648
Net cash collateral (held) provided	0	5,543
Commodity derivatives	(20,364)	(24,140)
Derivative assets (liabilities)
Net commodity derivative asset	33,801	15,704
Commodity contracts | Prepaid expenses and other current assets
Derivative assets (liabilities)
Net commodity derivative asset	54,165	39,844
Commodity contracts | Accrued expenses and other payables
Derivative assets (liabilities)
Net commodity derivative asset	(20,278)	(21,562)
Commodity contracts | Other noncurrent liabilities
Derivative assets (liabilities)
Net commodity derivative asset	(86)	(2,578)
Level 1 | Commodity contracts
Assets:
Derivative assets	39,882	12,312
Liabilities:
Derivative liabilities	(13,497)	(17,857)
Level 2 | Commodity contracts
Assets:
Derivative assets	33,588	37,520
Liabilities:
Derivative liabilities	$ (20,417)	$ (24,474)