COMMITMENTS AND CONTINGENCIES (Narrative) (Details) (USD $)	12 Months Ended
Sep. 30, 2012 DrillingUnits	Sep. 30, 2011	Sep. 30, 2010
Commitments and Contingencies Disclosure [Abstract]
Number of drilling units	5
Rent expense under operating leases	$ 5,500,000	$ 4,400,000	$ 4,800,000
Service taxes paid	10,100,000
Accrued additional service tax	1,800,000
Total service taxes	11,900,000
Long-term other receivable	$ 11,875,000	$ 11,875,000

Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_AccountsReceivableNetNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant