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PROPERTY, PLANT AND EQUIPMENT (Tables) | 3 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Schedule of Property, Plant and Equipment | Property, plant and equipment as of December 31, 2020 and September 30, 2020 consisted of the following:
(in thousands) | Estimated Useful Lives |  | December 31, 2020 |  | September 30, 2020
Drilling services equipment | 4 - 15 years |  | $ | 7,255,178 |  |  | $ | 7,313,234 |
Tubulars | 4 years |  | 612,431 |  |  | 615,281 |
Real estate properties | 10 - 45 years |  | 43,365 |  |  | 43,389 |
Other | 2 - 23 years |  | 465,205 |  |  | 464,704 |
Construction in progress (1) |  |  | 53,630 |  |  | 49,592 |
|  |  | 8,429,809 |  |  | 8,486,200 |
Accumulated depreciation |  |  | (4,877,702) |  |  | (4,839,859) |
Property, plant and equipment, net |  |  | $ | 3,552,107 |  |  | $ | 3,646,341 |
(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.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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