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PROPERTY, PLANT AND EQUIPMENT (Tables)
 9 Months Ended
Jun. 30, 2025
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property, plant and equipment as of June 30, 2025 and September 30, 2024 consisted of the following:
(in thousands)Estimated Useful LivesJune 30, 2025September 30, 2024
Drilling services equipment
2 - 15 years
$8,095,850 $6,671,975 
Tubulars
4 years
605,423 552,773 
Real estate properties
10 - 45 years
8,223 48,617 
Other
2 - 23 years
612,104 460,857 
Construction in progress1
203,822 106,183 
9,525,422 7,840,405 
Accumulated depreciation(5,117,266)(4,824,128)
Property, plant and equipment, net$4,408,156 $3,016,277 
Assets held-for-sale$14,238 $— 
(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.