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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION
 12 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION
NOTE 17 BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION
Description of the Business
We are a performance-driven drilling solutions and technologies company based in Tulsa, Oklahoma with operations in all major U.S. onshore oil and gas producing basins as well as South America and the Middle East. Our drilling operations consist mainly of contracting Company-owned drilling equipment primarily to large oil and gas exploration companies.  We believe we are the recognized industry leader in drilling as well as technological innovation. We focus on offering our customers an integrated solutions-based approach by combining proprietary rig technology, automation software, and digital expertise into our rig operations rather than a product-based offering, such as a rig or separate technology package. Our drilling services operations are organized into the following reportable operating business segments: North America Solutions, Offshore Gulf of Mexico and International Solutions. 
Each reportable operating segment is a strategic business unit that is managed separately, and consolidated revenues and expenses reflect the elimination of all material intercompany transactions. Our real estate operations, our incubator program for new research and development projects, and our wholly-owned captive insurance companies are included in "Other." External revenues included in “Other” primarily consist of rental income.
Segment Performance

We evaluate segment performance based on income or loss from continuing operations (segment operating income (loss)) before income taxes which includes:
•Revenues from external and internal customers
•Direct operating costs
•Depreciation and amortization
•Allocated general and administrative costs
•Asset impairment charges
•Restructuring charges
but excludes (gain) loss on sale of assets and corporate selling, general and administrative costs, corporate depreciation, and corporate restructuring charges.
General and administrative costs are allocated to the segments based primarily on specific identification and, to the extent that such identification is not practical, other methods may be used which we believe to be a reasonable reflection of the utilization of services provided.

Summarized financial information of our reportable segments for the fiscal years ended September 30, 2021, 2020 and 2019 is shown in the following tables:
September 30, 2021
(in thousands)North America SolutionsOffshore Gulf of MexicoInternational SolutionsOtherEliminationsTotal
External sales$1,026,364 $126,399 $57,917 $7,888 $— $1,218,568 
Intersegment— — — 35,416 (35,416)— 
Total sales1,026,364 126,399 57,917 43,304 (35,416)1,218,568 
Segment operating income (loss)(287,176)15,969 (21,003)(9,704)(1,580)(303,494)
Depreciation and amortization392,415 10,557 2,013 1,426 — 406,411 
September 30, 2020
(in thousands)North America SolutionsOffshore Gulf of MexicoInternational SolutionsOtherEliminationsTotal
External sales$1,474,380 $143,149 $144,185 $12,213 $— $1,773,927 
Intersegment— — — 36,901 (36,901)— 
Total sales1,474,380 143,149 144,185 49,114 (36,901)1,773,927 
Segment operating income (loss)(393,902)7,478 (162,368)4,403 — (544,389)
Depreciation and amortization438,039 11,681 17,531 1,241 — 468,492 

September 30, 2019
(in thousands)North America SolutionsOffshore Gulf of MexicoInternational SolutionsOtherEliminationsTotal
External sales$2,426,191 $147,635 $211,731 $12,933 $— $2,798,490 
Intersegment— — — — — — 
Total sales2,426,191 147,635 211,731 12,933 — 2,798,490 
Segment operating income80,898 19,594 5,366 3,375 — 109,233 
Depreciation and amortization504,466 10,010 35,466 1,523 — 551,465 


The following table reconciles segment operating income (loss) per the tables above to income (loss) from continuing operations before income taxes as reported on the Consolidated Statements of Operations:
Year Ended September 30,
(in thousands)202120202019
Segment operating income (loss)$(303,494)$(544,389)$109,233 
Gain on sale of assets1,042 46,775 39,691 
Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges(126,097)(122,573)(128,342)
Operating income (loss) from continuing operations(428,549)(620,187)20,582 
Other income (expense)
Interest and dividend income10,254 7,304 9,468 
Interest expense(23,955)(24,474)(25,188)
Gain (loss) on investment securities6,727 (8,720)(54,488)
Gain on sale of subsidiary— 14,963 — 
Other(5,657)(5,384)(1,596)
Total unallocated amounts(12,631)(16,311)(71,804)
Loss from continuing operations before income taxes$(441,180)$(636,498)$(51,222)
The following table reconciles segment total assets to total assets as reported on the Consolidated Balance Sheets:
Year Ended September 30,
(in thousands)20212020
Total assets1
North America Solutions$3,418,569 $3,812,718 
Offshore Gulf of Mexico84,580 93,501 
International Solutions269,820 181,181 
Other95,398 22,144 
3,868,367 4,109,544 
Investments and corporate operations1,165,761 720,077 
Total assets from continuing operations$5,034,128 $4,829,621 
(1)    Assets by segment exclude investments in subsidiaries and intersegment activity.

The following table presents revenues from external customers by country based on the location of service provided:
Year Ended September 30,
(in thousands)202120202019
Operating revenues
United States$1,158,230 $1,626,407 $2,585,008 
Argentina27,855 84,402 165,718 
Bahrain27,435 28,653 11,528 
United Arab Emirates957 24,716 4,728 
Colombia1,674 6,414 29,757 
Other foreign2,417 3,335 1,751 
Total$1,218,568 $1,773,927 $2,798,490 

    The following table presents property, plant and equipment by country based on the location of service provided:
Year Ended September 30,
(in thousands)20212020
Property, plant and equipment, net
United States$3,042,140 $3,562,525 
Argentina50,944 49,419 
Colombia22,959 21,740 
Other foreign11,244 12,657 
Total$3,127,287 $3,646,341