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PROPERTY, PLANT AND EQUIPMENT (Tables)
 6 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property, plant and equipment as of March 31, 2022 and September 30, 2021 consisted of the following:
(in thousands)Estimated Useful LivesMarch 31, 2022September 30, 2021
Drilling services equipment
4 - 15 years
$6,284,174 $6,229,011 
Tubulars4 years555,968 573,900 
Real estate properties
10 - 45 years
44,916 43,302 
Other
2 - 23 years
420,589 459,741 
Construction in progress (1)
  62,959 47,587 
  7,368,606 7,353,541 
Accumulated depreciation  (4,346,271)(4,226,254)
Property, plant and equipment, net  $3,022,335 $3,127,287 
Assets held-for-sale$57,373 $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, 2021$71,453 
Plus:
Asset additions1,459 
Less:
Sale of assets held-for-sale(15,539)
Balance at March 31, 2022
$57,373