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PROPERTY, PLANT AND EQUIPMENT (Tables)
3 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property, plant and equipment as of December 31, 2021 and September 30, 2021 consisted of the following:
(in thousands)Estimated Useful LivesDecember 31, 2021September 30, 2021
Drilling services equipment
4 - 15 years
$6,256,764 $6,229,011 
Tubulars4 years568,273 573,900 
Real estate properties
10 - 45 years
43,303 43,302 
Other
2 - 23 years
421,091 459,741 
Construction in progress (1)
  53,481 47,587 
  7,342,912 7,353,541 
Accumulated depreciation  (4,276,586)(4,226,254)
Property, plant and equipment, net  $3,066,326 $3,127,287 
Assets held-for-sale$62,821 $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 additions1,025 
Less:
Sale of assets held-for-sale(9,657)
Balance at December 31, 2021
$62,821