FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Mar. 31, 2011
Fair value of assets and liabilities
Other current assets	$ 52,045	$ 55,668
TOTAL ASSETS	1,170,487	1,306,625
Other liabilities	3,983	7,478
Fair value measurements on recurring basis | Level 1
Fair value of assets and liabilities
Other current assets	12,096
TOTAL ASSETS	12,096
Other current liabilities	12,096
Total liabilities	12,096
Fair value measurements on recurring basis | Level 2
Fair value of assets and liabilities
Other liabilities	698
Total liabilities	698
Fair value measurements on recurring basis | Total Fair Value
Fair value of assets and liabilities
Other current assets	12,096
TOTAL ASSETS	12,096
Other current liabilities	12,096
Other liabilities	698
Total liabilities	$ 12,794