BANK BORROWINGS AND LONG-TERM DEBT - Borrowings Outstanding (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Feb. 28, 2013
Bank borrowings and long-term debt
Carrying amount	$ 2,954,457
Debt issuance costs	(13,815)	$ (16,007)
Long-term debt, net of debt issuance cost	2,940,642	2,952,143
Current portion, net of debt issuance costs	(43,011)	(61,534)
Non-current portion	$ 2,897,631	$ 2,890,609
Weighted average interest rate	3.90%	3.50%
4.625% Notes due February 2020
Bank borrowings and long-term debt
Debt instrument interest rate	4.625%		4.625%
Carrying amount	$ 500,000	$ 500,000
Term Loan, including current portion, due in installments through November 2021
Bank borrowings and long-term debt
Carrying amount	687,813	700,000
Term Loan, including current portion, due in installments through June 2022
Bank borrowings and long-term debt
Carrying amount	$ 483,656	502,500
5.000% Notes due February 2023
Bank borrowings and long-term debt
Debt instrument interest rate	5.00%		5.00%
Carrying amount	$ 500,000	500,000
4.750% Notes due June 2025
Bank borrowings and long-term debt
Debt instrument interest rate	4.75%
Carrying amount	$ 596,387	595,979
Other
Bank borrowings and long-term debt
Carrying amount	$ 186,601	$ 169,671

Long-term Debt, Net of Debt Issuance Costs

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Contractual interest rate for funds borrowed, under the debt agreement.

+ 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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)
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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. 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
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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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