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DISAGGREGATION OF REVENUE (Details) - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
DISAGGREGATION OF REVENUE
Total revenue from contracts	$ 411,001,373	$ 351,876,861
Earned over time
DISAGGREGATION OF REVENUE
Total revenue from contracts	284,868,712	214,705,335
Earned at point in time
DISAGGREGATION OF REVENUE
Total revenue from contracts	126,132,661	137,171,526
Lump sum contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	141,753,561	121,997,872
Unit price contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	201,775,642	157,833,157
Cost plus and T&M contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	67,472,170	72,045,832
Gas & Water Distribution
DISAGGREGATION OF REVENUE
Total revenue from contracts	149,574,917	82,426,199
Gas & Water Distribution | Earned over time
DISAGGREGATION OF REVENUE
Total revenue from contracts	84,260,791	9,541,650
Gas & Water Distribution | Earned at point in time
DISAGGREGATION OF REVENUE
Total revenue from contracts	65,314,126	72,884,549
Gas & Water Distribution | Lump sum contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	0	0
Gas & Water Distribution | Unit price contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	149,574,917	82,426,199
Gas & Water Distribution | Cost plus and T&M contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	0	0
Gas & Petroleum Transmission
DISAGGREGATION OF REVENUE
Total revenue from contracts	64,586,137	81,055,175
Gas & Petroleum Transmission | Earned over time
DISAGGREGATION OF REVENUE
Total revenue from contracts	48,061,502	71,265,020
Gas & Petroleum Transmission | Earned at point in time
DISAGGREGATION OF REVENUE
Total revenue from contracts	16,524,635	9,790,155
Gas & Petroleum Transmission | Lump sum contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	0	0
Gas & Petroleum Transmission | Unit price contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	48,061,502	71,265,020
Gas & Petroleum Transmission | Cost plus and T&M contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	16,524,635	9,790,155
Electrical, Mechanical, & General
DISAGGREGATION OF REVENUE
Total revenue from contracts	196,840,319	188,395,487
Electrical, Mechanical, & General | Earned over time
DISAGGREGATION OF REVENUE
Total revenue from contracts	152,546,419	133,898,665
Electrical, Mechanical, & General | Earned at point in time
DISAGGREGATION OF REVENUE
Total revenue from contracts	44,293,900	54,496,822
Electrical, Mechanical, & General | Lump sum contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	141,753,561	121,997,872
Electrical, Mechanical, & General | Unit price contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	4,139,223	4,141,938
Electrical, Mechanical, & General | Cost plus and T&M contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	$ 50,947,535	$ 62,255,677

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