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PROPERTY, PLANT AND EQUIPMENT | 3 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | NOTE 5 PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment as of December 31, 2019 and September 30, 2019 consisted of the following:
(in thousands) | Estimated Useful Lives |  | December 31, 2019 |  | September 30, 2019
Contract drilling services equipment | 4 - 15 years |  | $ | 7,739,064 |  |  | $ | 7,881,323 |
Tubulars | 4 years |  | 611,730 |  |  | 618,310 |
Real estate properties | 10 - 45 years |  | 72,512 |  |  | 72,507 |
Other | 2 - 23 years |  | 463,962 |  |  | 471,803 |
Construction in progress (1) |  |  | 135,142 |  |  | 117,761 |
|  |  | 9,022,410 |  |  | 9,161,704 |
Accumulated depreciation |  |  | (4,610,051 | ) |  | (4,659,620 | )
Property, plant and equipment, net |  |  | $ | 4,412,359 |  |  | $ | 4,502,084 |
(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.
Depreciation Depreciation expense in the Unaudited Condensed Consolidated Statements of Operations was $128.2 million and $140.0 million, which includes abandonments of $0.8 million and $1.0 million for the three months ended December 31, 2019 and 2018, respectively. Gain on Sale of Assets We had gains on sales of assets of $4.3 million and $5.5 million for the three months ended December 31, 2019 and 2018, respectively. These gains were primarily related to reimbursement for drill pipe damaged or lost in drilling operations.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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