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PROPERTY, PLANT AND EQUIPMENT | 3 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | NOTE 4 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. Depreciation Depreciation expense in the Unaudited Condensed Consolidated Statements of Operations was $105.1 million and $128.2 million, including $0.3 million and $0.8 million in abandonments, for the three months ended December 31, 2020 and 2019, respectively. Gain on Sale of Assets We had a gain on sale of assets of $12.3 million and $4.3 million for the three months ended December 31, 2020 and 2019, respectively. During the three months ended December 31, 2020, we closed on the sale of an offshore platform rig within our Offshore Gulf of Mexico operating segment for total consideration of $12.0 million with an aggregate net book value of $2.8 million, resulting in a gain of $9.2 million, which is included within Gain on Sale of Assets on our Unaudited Condensed Consolidated Statements of Operations. We also had gains on asset sales related to customer reimbursement for the replacement value of drill pipe damaged or lost in drilling operations. Decommissioning During the fiscal year ended September 30, 2020, we decommissioned two rigs and 35 rigs from our legacy Domestic Conventional asset group and FlexRig3® asset group, respectively. The decommissioned rigs were impaired as of March 31, 2020. We did not decommission any rigs during the three months ended December 31, 2020.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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