Fair Value of Financial Instruments - Fair Value of Commodity Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023
Derivative assets (liabilities)
Net commodity derivative asset	$ 20,051	$ 19,011
Prepaid expenses and other current assets
Derivative assets (liabilities)
Net commodity derivative asset	20,300
Accrued expenses and other payables
Derivative assets (liabilities)
Net commodity derivative asset	13,000
Commodity contracts
Assets:
Derivative assets	90,800	88,681
Netting of counterparty contracts, assets	(11,075)	(6,670)
Net cash collateral held	(45,800)	(47,686)
Commodity derivatives	33,925	34,325
Liabilities:
Derivative liabilities	(24,084)	(21,870)
Netting of counterparty contracts, liabilities	11,075	6,670
Net cash collateral held	(865)	(114)
Commodity derivatives	(13,874)	(15,314)
Derivative assets (liabilities)
Net commodity derivative asset	20,051	19,011
Commodity contracts | Prepaid expenses and other current assets
Derivative assets (liabilities)
Net commodity derivative asset	31,653	33,875
Commodity contracts | Other noncurrent assets
Derivative assets (liabilities)
Net commodity derivative asset	2,272	450
Commodity contracts | Accrued expenses and other payables
Derivative assets (liabilities)
Net commodity derivative asset	(12,874)	(14,752)
Commodity contracts | Other noncurrent liabilities
Derivative assets (liabilities)
Net commodity derivative asset	(1,000)	(562)
Level 1 | Commodity contracts
Assets:
Derivative assets	60,126	63,553
Liabilities:
Derivative liabilities	(8,061)	(6,043)
Level 2 | Commodity contracts
Assets:
Derivative assets	30,674	25,128
Liabilities:
Derivative liabilities	$ (16,023)	$ (15,827)