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PROPERTY, PLANT AND EQUIPMENT (Tables)
 6 Months Ended
Mar. 31, 2020
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
Property, plant and equipment as of March 31, 2020 and September 30, 2019 consisted of the following:
(in thousands)
Estimated Useful Lives
 
March 31, 2020
 
September 30, 2019
Contract drilling services equipment
4 - 15 years
 
$
7,330,789

 
$
7,881,323

Tubulars
4 years
 
615,238

 
618,310

Real estate properties
10 - 45 years
 
72,517

 
72,507

Other
2 - 23 years
 
474,148

 
471,803

Construction in progress (1)
  
 
71,252

 
117,761

 
  
 
8,563,944

 
9,161,704

Accumulated depreciation
  
 
(4,723,731
)
 
(4,659,620
)
Property, plant and equipment, net
  
 
$
3,840,213

 
$
4,502,084


(1)
Included in construction in progress are costs for projects in progress to upgrade or refurbish certain rigs in our existing fleet.  Additionally, we include other capital maintenance purchase-orders that are open/in process.  As these various projects are completed, the costs are then classified to their appropriate useful life category.