SUPPLEMENTAL CASH FLOW DISCLOSURES (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Net cash paid for:      
Interest $ 87,179 $ 86,406 $ 66,071
Income taxes 70,621 87,561 52,306
Non-cash investing activity:      
Unpaid purchases of property and equipment $ 115,757 $ 42,902 $ 89,718