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Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) | Sep. 30, 2021 | Mar. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Finance lease obligations (see Note 1) | $ 51,116,000 | $ 56,336,000
Total debt | 2,159,551,000 | 1,854,597,000
Unamortized discount and debt issuance costs | (19,013,000) | (21,441,000)
Less: current portion of long-term debt | 29,965,000 | 30,472,000
Total long-term debt | 2,110,573,000 | 1,802,684,000
2028 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | 400,000,000 | 400,000,000
2027 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | 600,000,000 | 600,000,000
2025 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | 700,000,000 | 700,000,000
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | 320,000,000 |
Ex-Im Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | $ 88,435,000 | $ 98,261,000

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