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SEGMENT INFORMATION - Segment property, plant and equipment, at cost, less accumulated depreciation (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024
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

X

- 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
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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

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+ References

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