Long-term Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Less: debt issuance costs	$ (20,090)	$ (24,053)
Long-term debt	1,610,940	1,957,543
Current portion of long-term debt	4,653	5,247
Long-term debt, less current portion	1,606,287	1,952,296
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term debt	18,541	20,125
Senior Secured First Lien Notes Due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	587,489	700,000
Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	525,000	525,000
Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt		236,471
Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500,000	$ 500,000

Amount of short-term and long-term debt and lease obligation.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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