Debt - Valuation of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Fair Value
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	$ 826,462	$ 379,204
Fair Value | Equipment Financing
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	22,887	29,302
Carrying Value
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	874,051	381,254
Carrying Value | Equipment Financing
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	24,051	31,254
Senior Notes due 2027 | Fair Value | Senior Notes
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	320,555	349,902
Senior Notes due 2027 | Carrying Value | Senior Notes
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	350,000	350,000
Senior Notes due 2030 | Fair Value | Senior Notes
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	483,020	0
Senior Notes due 2030 | Carrying Value | Senior Notes
Debt Instrument [Line Items]
Fair value of senior notes and equipment financing	$ 500,000	$ 0