FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Other Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Feb. 28, 2013
4.625% Notes due February 2020
Other financial instruments
Debt instrument interest rate	4.625%		4.625%
4.750% Notes due June 2025
Other financial instruments
Debt instrument interest rate	4.75%
Level 1 | 4.625% Notes due February 2020
Other financial instruments
Debt instrument interest rate	4.625%	4.625%
Carrying Amount
Other financial instruments
Fair Value	$ 2,950,817	$ 2,958,911
Carrying Amount | Level 1 | 4.625% Notes due February 2020
Other financial instruments
Fair Value	500,000	500,000
Carrying Amount | Level 1 | 4.625% Notes due February 2020
Other financial instruments
Fair Value	687,813	700,000
Carrying Amount | Level 1 | Term Loan, including current portion, due in installments through June 2022
Other financial instruments
Fair Value	483,656	502,500
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	596,387	595,979
Carrying Amount | Level 1 | Euro Term Loan due September 2020
Other financial instruments
Fair Value	59,443	53,075
Carrying Amount | Level 1 | Euro Term Loan due January 2022
Other financial instruments
Fair Value	123,518	107,357
Total
Other financial instruments
Fair Value	3,024,692	3,057,943
Total | Level 1 | 4.625% Notes due February 2020
Other financial instruments
Fair Value	513,596	526,255
Total | Level 1 | 4.625% Notes due February 2020
Other financial instruments
Fair Value	689,966	699,566
Total | Level 1 | Term Loan, including current portion, due in installments through June 2022
Other financial instruments
Fair Value	485,470	503,756
Total | Level 1 | 5.000% Notes due February 2023
Other financial instruments
Fair Value	525,292	534,820
Total | Level 1 | 4.750% Notes due June 2025
Other financial instruments
Fair Value	627,407	633,114
Total | Level 1 | Euro Term Loan due September 2020
Other financial instruments
Fair Value	59,443	53,075
Total | Level 1 | Euro Term Loan due January 2022
Other financial instruments
Fair Value	$ 123,518	$ 107,357