FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Debt Not Carried at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
4.625% Notes due February 2020
Other financial instruments
Debt instrument interest rate (as a percent)	4.625%	4.625%
5.000% Notes due February 2023
Other financial instruments
Debt instrument interest rate (as a percent)	5.00%	5.00%
4.750% Notes due June 2025
Other financial instruments
Debt instrument interest rate (as a percent)	4.75%	4.75%
Level 1 | 4.625% Notes due February 2020
Other financial instruments
Debt instrument interest rate (as a percent)	4.625%	4.625%
Level 1 | 5.000% Notes due February 2023
Other financial instruments
Debt instrument interest rate (as a percent)	5.00%	5.00%
Level 1 | 4.750% Notes due June 2025
Other financial instruments
Debt instrument interest rate (as a percent)	4.75%	4.75%
Carrying Amount
Other financial instruments
Fair Value	$ 2,956,665	$ 2,950,817
Carrying Amount | Level 1 | 4.625% Notes due February 2020
Other financial instruments
Fair Value	500,000	500,000
Carrying Amount | Level 1 | Term Loan, including current portion, due in installments through November 2021
Other financial instruments
Fair Value	675,625	687,813
Carrying Amount | Level 1 | Term Loan, including current portion, due in installments through June 2022
Other financial instruments
Fair Value	464,813	483,656
Carrying Amount | Level 1 | 5.000% Notes due February 2023
Other financial instruments
Fair Value	500,000	500,000
Carrying Amount | Level 1 | 4.750% Notes due June 2025
Other financial instruments
Fair Value	596,706	596,387
Carrying Amount | Level 1 | Euro Term Loan due September 2020
Other financial instruments
Fair Value	53,806	59,443
Carrying Amount | Level 1 | Euro Term Loan due January 2022
Other financial instruments
Fair Value	113,814	123,518
Carrying Amount | Level 1 | India Term Loan
Other financial instruments
Fair Value	51,901	0
Fair Value
Other financial instruments
Fair Value	2,939,651	3,024,692
Fair Value | Level 1 | 4.625% Notes due February 2020
Other financial instruments
Fair Value	502,475	513,596
Fair Value | Level 1 | Term Loan, including current portion, due in installments through November 2021
Other financial instruments
Fair Value	664,646	689,966
Fair Value | Level 1 | Term Loan, including current portion, due in installments through June 2022
Other financial instruments
Fair Value	464,525	485,470
Fair Value | Level 1 | 5.000% Notes due February 2023
Other financial instruments
Fair Value	500,760	525,292
Fair Value | Level 1 | 4.750% Notes due June 2025
Other financial instruments
Fair Value	587,724	627,407
Fair Value | Level 1 | Euro Term Loan due September 2020
Other financial instruments
Fair Value	53,806	59,443
Fair Value | Level 1 | Euro Term Loan due January 2022
Other financial instruments
Fair Value	113,814	123,518
Fair Value | Level 1 | India Term Loan
Other financial instruments
Fair Value	$ 51,901	$ 0