Significant Accounting Policies - Other Noncurrent Assets (Details) $ in Thousands	Sep. 30, 2025 USD ($) bbl	Mar. 31, 2025 USD ($) bbl
Other Assets, Noncurrent [Abstract]
Linefill	$ 5,240	$ 5,240
Loan receivable (2)	0	3,089
Other	10,254	11,646
Total	15,494	19,975
Other Noncurrent Assets
Loan receivable	3,600	6,100
Loan receivable, current	$ 3,600	$ 3,000
Crude oil
Other Noncurrent Assets
Number of barrels of product | bbl	95,877	90,881