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Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 1,062,401,000 | $ 879,422,000
Unamortized premium/(discount and debt issuance costs), net | (38,696,000) | (30,651,000)
Less: current portion of long-term debt | 45,300,000 | 288,000
Total long-term debt | 978,405,000 | 848,483,000
2025 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 700,000,000 |
2020 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Total debt |  | 575,000,000
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 0 | 0
Ex-Im Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 362,401,000 | 304,134,000
Other [Member] |  |
Debt Instrument [Line Items] |  |
Total debt |  | $ 288,000

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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