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Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) | Sep. 30, 2020 | Mar. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Finance lease obligations (see Note 6) | $ 62,872,000 | $ 64,956,000
Total debt | 1,870,959,000 | 1,872,869,000
Unamortized discount and debt issuance costs | (23,981,000) | (21,418,000)
Less: current portion of long-term debt | 32,301,000 | 29,788,000
Total long-term debt | 1,814,677,000 | 1,821,663,000
2028 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | 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 |  | 390,000,000
Ex-Im Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | $ 108,087,000 | $ 117,913,000

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