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PROPERTY, PLANT AND EQUIPMENT (Tables)
12 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
At September 30, 2021 and 2020, the cost and accumulated depreciation for real estate properties were as follows:
September 30,
(in thousands)2021    2020
Real estate properties$43,302 $43,389 
Accumulated depreciation(28,846)(27,588)
$14,456 $15,801 
Property, plant and equipment as of September 30, 2021 and 2020 consisted of the following:
(in thousands)Estimated Useful LivesSeptember 30, 2021September 30, 2020
Drilling services equipment
4 - 15 years
$6,229,011 7,313,234 
Tubulars
4 years
573,900 615,281 
Real estate properties
10 - 45 years
43,302 43,389 
Other
2 - 23 years
459,741 464,704 
Construction in progress1
47,587 49,592 
7,353,541 8,486,200 
Accumulated depreciation(4,226,254)(4,839,859)
Property, plant and equipment, net$3,127,287 $3,646,341 
Assets held-for-sale$71,453 $— 
(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 additions77,929 
Less:
Sale of assets held-for-sale(6,476)
Balance at September 30, 2021
$71,453