Debt - Valuation of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Mar. 31, 2026
Fair Value
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	$ 959,909	$ 998,131
Fair Value \| Other debt
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	2,364	2,961
Carrying Value
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	1,002,448	1,003,056
Carrying Value \| Other debt
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	2,448	3,056
Senior Notes due 2030 \| Fair Value \| Senior Notes
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	495,395	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	462,150	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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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+ Details