SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Estimated Useful Lives of Assets) (Details)	12 Months Ended
	Sep. 30, 2016
Drill pipe [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	3 years
Minimum [Member] | Drilling vessels and related equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	5 years
Minimum [Member] | Furniture and other [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	3 years
Maximum [Member] | Drilling vessels and related equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	35 years
Maximum [Member] | Furniture and other [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	10 years