FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Carrying amounts and related estimated fair values of financial instruments not recorded at fair value in financial statements
Long-term debt	$ 1,101,249	$ 1,158,862
Carrying Value
Carrying amounts and related estimated fair values of financial instruments not recorded at fair value in financial statements
Long-term debt	1,101,249	1,158,862
Total Fair Value
Carrying amounts and related estimated fair values of financial instruments not recorded at fair value in financial statements
Long-term debt	$ 1,282,311	$ 1,385,264

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant