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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
At September 30, 2020 and 2019, the cost and accumulated depreciation for real estate properties were as follows:
 
September 30,
(in thousands)
2020
    
2019
Real estate properties
$
43,389

 
$
72,507

Accumulated depreciation
(27,588
)
 
(43,570
)
 
$
15,801

 
$
28,937


Property, plant and equipment as of September 30, 2020 and 2019 consisted of the following:
(in thousands)
Estimated Useful Lives
 
September 30, 2020
 
September 30, 2019
Drilling services equipment
4 - 15 years
 
$
7,313,234

 
7,881,323

Tubulars
4 years
 
615,281

 
618,310

Real estate properties
10 - 45 years
 
43,389

 
72,507

Other
2 - 23 years
 
464,704

 
471,803

Construction in progress (1)
 
 
49,592

 
117,761

 
 
 
8,486,200

 
9,161,704

Accumulated depreciation
 
 
(4,839,859
)
 
(4,659,620
)
Property, plant and equipment, net
 
 
$
3,646,341

 
$
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.