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PROPERTY, PLANT AND EQUIPMENT (Tables)
9 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
Property, plant and equipment as of June 30, 2019 and September 30, 2018 consisted of the following:
(in thousands)
Estimated Useful Lives
 
June 30, 2019
 
September 30, 2018
Contract drilling equipment
4 - 15 years
 
$
8,486,332

 
$
8,442,081

Real estate properties
10 - 45 years
 
71,114

 
68,888

Other
2 - 23 years
 
469,933

 
471,310

Construction in progress
  
 
158,936

 
163,968

 
  
 
9,186,315

 
9,146,247

Accumulated depreciation
  
 
(4,602,642
)
 
(4,288,865
)
Property, plant and equipment, net
  
 
$
4,583,673

 
$
4,857,382