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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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