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Debt - Valuation of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026
Fair Value
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	$ 999,666	$ 998,131
Fair Value | Other debt
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	2,666	2,961
Carrying Value
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	1,002,752	1,003,056
Carrying Value | Other debt
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	2,752	3,056
Senior Notes due 2030 | Fair Value | Senior Notes
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	507,240	505,940
Senior Notes due 2030 | Carrying Value | Senior Notes
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	500,000	500,000
5.375% Senior Notes Due 2034 | Fair Value | Senior Notes
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	489,760	489,230
5.375% Senior Notes Due 2034 | Carrying Value | Senior Notes
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	$ 500,000	$ 500,000

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