SUPPLEMENTAL CASH FLOW DISCLOSURES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Net cash paid for:
Interest	$ 86,406	$ 66,071	$ 42,067
Income taxes	87,561	52,306	66,013
Non-cash investing activity:
Accounts payable for fixed assets purchases	$ 42,902	$ 89,718	$ 63,671