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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Estimated Useful Lives of Assets) (Details)
 12 Months Ended
Sep. 30, 2015
Drill pipe [Member]  
Estimated useful lives of assets 3 years
Minimum [Member] | Drilling vessels and related equipment [Member]  
Estimated useful lives of assets 5 years
Minimum [Member] | Furniture and other [Member]  
Estimated useful lives of assets 3 years
Maximum [Member] | Drilling vessels and related equipment [Member]  
Estimated useful lives of assets 35 years
Maximum [Member] | Furniture and other [Member]  
Estimated useful lives of assets 10 years