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PROPERTY, PLANT AND EQUIPMENT (Tables)
9 Months Ended
Jun. 30, 2023
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property, plant and equipment as of June 30, 2023 and September 30, 2022 consisted of the following:
(in thousands)Estimated Useful LivesJune 30, 2023September 30, 2022
Drilling services equipment
4 - 15 years
$6,382,505 $6,369,888 
Tubulars
4 years
571,490 569,496 
Real estate properties
10 - 45 years
47,045 45,557 
Other
2 - 23 years
438,908 422,479 
Construction in progress1
92,829 70,119 
7,532,777 7,477,539 
Accumulated depreciation(4,600,184)(4,516,730)
Property, plant and equipment, net$2,932,593 $2,960,809 
Assets held-for-sale$988 $4,333 
(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 advances for 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 is a summary of the changes in the balance (in thousands) of our assets held-for-sale for the period indicated below:
Balance at September 30, 2022
$4,333 
Plus:
Asset additions1,177 
Less:
Sale of assets held-for-sale(1,789)
Impairment expense(2,733)
Balance at June 30, 2023
$988