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Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Finance lease obligations (see Note 6) | $ 67,515,000 |
Total debt | 1,595,428,000 | $ 1,439,560,000
Unamortized discount and debt issuance costs | (22,636,000) | (26,720,000)
Less: current portion of long-term debt | 30,101,000 | 19,937,000
Total long-term debt | 1,542,691,000 | 1,392,903,000
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 | 110,000,000 | 0
Ex-Im Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | $ 117,913,000 | $ 139,560,000

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