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SEGMENT INFORMATION - Segment property, plant and equipment, at cost, less accumulated depreciation (Details) - USD ($) | Sep. 30, 2025 | Sep. 30, 2024
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SEGMENT INFORMATION |  |
Property and equipment, net | $ 53,467,967 | $ 38,135,714
Underground Infrastructure Construction |  |
SEGMENT INFORMATION |  |
Property and equipment, net | 38,062,083 | 22,807,607
Industrial Construction |  |
SEGMENT INFORMATION |  |
Property and equipment, net | 14,206,055 | 14,279,280
Building Construction |  |
SEGMENT INFORMATION |  |
Property and equipment, net | 1,161,970 | 1,036,669
Operating Segments |  |
SEGMENT INFORMATION |  |
Property and equipment, net | 53,430,108 | 38,123,556
Operating Segments | Underground Infrastructure Construction |  |
SEGMENT INFORMATION |  |
Property and equipment, net | 38,062,083 | 22,807,607
Operating Segments | Industrial Construction |  |
SEGMENT INFORMATION |  |
Property and equipment, net | 14,206,055 | 14,279,280
Operating Segments | Building Construction |  |
SEGMENT INFORMATION |  |
Property and equipment, net | 1,161,970 | 1,036,669
Corporate |  |
SEGMENT INFORMATION |  |
Property and equipment, net | $ 37,859 | $ 12,158

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478451/942-360-50-1 + Details
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