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PROPERTY AND EQUIPMENT (Property and Equipment by Classification) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Property, Plant and Equipment [Line Items]      
Cost $ 4,815,962 $ 4,568,153  
Less: Accumulated depreciation (643,830) (601,125)  
Drilling and other property and equipment, net 4,172,132 3,967,028 $ 3,164,724
Drilling vessels equipment [Member]      
Property, Plant and Equipment [Line Items]      
Cost 4,003,483 4,181,774  
Construction work in progress [Member]      
Property, Plant and Equipment [Line Items]      
Cost 720,852 319,548  
Drill pipe [Member]      
Property, Plant and Equipment [Line Items]      
Cost 55,248 31,265  
Office equipment and other [Member]      
Property, Plant and Equipment [Line Items]      
Cost $ 36,379 $ 35,566