Fair Value of Financial Instruments - Gains (Losses) from Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivative contract information
Net adjustments to fair value of derivatives			$ 10,245	$ (3,016)
Commodity contracts
Derivative contract information
Net adjustments to fair value of derivatives	$ 1,100	$ 2,800	10,600	2,600
Interest rate swaps
Derivative contract information
Net adjustments to fair value of derivatives	$ 300	$ (6,000)	$ (300)	$ (5,600)