DISAGGREGATION OF REVENUE (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
DISAGGREGATION OF REVENUE
Total revenue from contracts	$ 130,005,928	$ 103,601,585	$ 337,291,570	$ 280,926,850
Earned over time
DISAGGREGATION OF REVENUE
Total revenue from contracts	130,005,928	103,601,585	223,186,176	237,591,491
Earned at point in time
DISAGGREGATION OF REVENUE
Total revenue from contracts		0	114,105,394	43,335,359
Lump sum contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	44,175,946	34,447,972	111,513,581	106,377,171
Unit price contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	59,942,280	49,016,768	148,178,547	130,917,311
Cost plus and T&M contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	25,887,702	20,136,845	77,599,442	43,632,368
Gas & Water Distribution
DISAGGREGATION OF REVENUE
Total revenue from contracts	48,268,807	38,566,422	120,216,883	96,967,546
Gas & Water Distribution | Earned over time
DISAGGREGATION OF REVENUE
Total revenue from contracts	48,268,807	38,566,422	62,810,583	76,527,417
Gas & Water Distribution | Earned at point in time
DISAGGREGATION OF REVENUE
Total revenue from contracts		0	57,406,300	20,440,129
Gas & Water Distribution | Lump sum contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	0	0	0	0
Gas & Water Distribution | Unit price contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	37,435,062	38,566,422	88,784,350	96,967,546
Gas & Water Distribution | Cost plus and T&M contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	10,833,745	0	31,432,533	0
Gas & Petroleum Transmission
DISAGGREGATION OF REVENUE
Total revenue from contracts	21,230,426	15,325,950	56,379,242	37,177,225
Gas & Petroleum Transmission | Earned over time
DISAGGREGATION OF REVENUE
Total revenue from contracts	21,230,426	15,325,950	24,727,176	36,861,048
Gas & Petroleum Transmission | Earned at point in time
DISAGGREGATION OF REVENUE
Total revenue from contracts		0	31,652,066	316,177
Gas & Petroleum Transmission | Lump sum contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	0	0	0	0
Gas & Petroleum Transmission | Unit price contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	21,230,426	9,669,098	56,379,242	31,204,196
Gas & Petroleum Transmission | Cost plus and T&M contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	0	5,656,852	0	5,973,029
Electrical, Mechanical, & General
DISAGGREGATION OF REVENUE
Total revenue from contracts	60,506,695	49,709,213	160,695,445	146,782,079
Electrical, Mechanical, & General | Earned over time
DISAGGREGATION OF REVENUE
Total revenue from contracts	60,506,695	49,709,213	135,648,417	124,203,026
Electrical, Mechanical, & General | Earned at point in time
DISAGGREGATION OF REVENUE
Total revenue from contracts		0	25,047,028	22,579,053
Electrical, Mechanical, & General | Lump sum contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	44,175,946	34,447,972	111,513,581	106,377,171
Electrical, Mechanical, & General | Unit price contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	1,276,792	781,248	3,014,955	2,745,569
Electrical, Mechanical, & General | Cost plus and T&M contracts
DISAGGREGATION OF REVENUE
Total revenue from contracts	$ 15,053,957	$ 14,479,993	$ 46,166,909	$ 37,659,339