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PROPERTY, PLANT AND EQUIPMENT (Tables)
9 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property, plant and equipment as of June 30, 2021 and September 30, 2020 consisted of the following:
(in thousands)Estimated Useful LivesJune 30, 2021September 30, 2020
Drilling services equipment
4 - 15 years
$6,456,608 $7,313,234 
Tubulars4 years602,689 615,281 
Real estate properties
10 - 45 years
43,358 43,389 
Other
2 - 23 years
464,571 464,704 
Construction in progress (1)
  47,844 49,592 
  7,615,070 8,486,200 
Accumulated depreciation  (4,333,988)(4,839,859)
Property, plant and equipment, net  $3,281,082 $3,646,341 
Assets held-for-sale$10,088 $— 
(1)Included in construction in progress are costs for projects in progress to upgrade or refurbish certain rigs in our existing fleet.  Additionally, we include other capital maintenance purchase-orders that are open/in process.  As these various projects are completed, the costs are then classified to their appropriate useful life category.
Schedule of Assets Held-for-Sale
The following table summarizes the balance (in thousands) of our assets held-for-sale at the dates indicated below:
Balance at September 30, 2020$— 
Plus:
Asset additions13,516 
Less:
Sale of assets held-for-sale(3,428)
Balance at June 30, 2021$10,088