FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Debt Not Carried at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017
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	$ 2,968,648	$ 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 | Term Loan, including current portion, due in installments through June 2022
Other financial instruments
Fair Value	700,000	700,000
Carrying Amount | Level 1 | Term Loan, including current portion, due in installments through June 2022
Other financial instruments
Fair Value	502,500	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	596,078	595,979
Carrying Amount | Level 1 | Euro Term Loan due September 2020
Other financial instruments
Fair Value	55,977	53,075
Carrying Amount | Level 1 | Euro Term Loan due January 2022
Other financial instruments
Fair Value	114,093	107,357
Fair Value
Other financial instruments
Fair Value	3,085,666	3,057,943
Fair Value | Level 1 | 4.625% Notes due February 2020
Other financial instruments
Fair Value	526,370	526,255
Fair Value | Level 1 | Term Loan, including current portion, due in installments through June 2022
Other financial instruments
Fair Value	699,125	699,566
Fair Value | Level 1 | Term Loan, including current portion, due in installments through June 2022
Other financial instruments
Fair Value	503,405	503,756
Fair Value | Level 1 | 5.000% Notes due February 2023
Other financial instruments
Fair Value	546,820	534,820
Fair Value | Level 1 | 4.750% Notes due June 2025
Other financial instruments
Fair Value	639,876	633,114
Fair Value | Level 1 | Euro Term Loan due September 2020
Other financial instruments
Fair Value	55,977	53,075
Fair Value | Level 1 | Euro Term Loan due January 2022
Other financial instruments
Fair Value	$ 114,093	$ 107,357