RETIREMENT AND EMPLOYEE BENEFIT PLANS - Summary of Participation in Pension Fund Plan (Details) - USD ($)		12 Months Ended
Dec. 15, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
RETIREMENT AND EMPLOYEE BENEFIT PLANS
Multiemployer Plan, Employer Contribution, Cost		$ 11,599,157	$ 6,420,550
Payments for installment	$ 41,000
Amount expensed		$ 0	$ 164,000
Central States, Southeast and Southwest Areas Pension Fund
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		36-6044243/001	36-6044243/001	36-6044243/001
Pension Protection Act ("PPA") Certified Zone Status			Red	Red
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies		$ 160,566	$ 123,142
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Employer-Teamsters Local Nos. 175 and 505
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		55-6021850/001	55-6021850/001	55-6021850/001
Pension Protection Act ("PPA") Certified Zone Status			Red	Red
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies			$ 0
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Laborers National Pension Fund
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		75-1280827/001	75-1280827/001	75-1280827/001
Pension Protection Act ("PPA") Certified Zone Status			Red	Red
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies		$ 46,167	$ 384,908
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Laborers' District Council of Western Pennsylvania Pension Plan
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		25-6135576/001	25-6135576/001	25-6135576/001
Pension Protection Act ("PPA") Certified Zone Status			Yellow	Yellow
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies			$ 269,915
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Operating Engineers Local 324 Pension Fund
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		38-1900637/001	38-1900637/001	38-1900637/001
Pension Protection Act ("PPA") Certified Zone Status			Red	Red
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies		$ 837	$ 66,757
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
National Automatic Sprinkler Industry Pension Fund
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		52-6054620/001	52-6054620/001	52-6054620/001
Pension Protection Act ("PPA") Certified Zone Status			Red	Red
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies		$ 214,590	$ 199,984
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Iron Workers District Council of Southern Ohio &Vicinity Pension Trust
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		31-6038516/001	31-6038516/001	31-6038516/001
Pension Protection Act ("PPA") Certified Zone Status			Green	Yellow
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies		$ 279,998	$ 208,588
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Carpenters Pension Fund of WV
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		55-6027998/001	55-6027998/001	55-6027998/001
Pension Protection Act ("PPA") Certified Zone Status			Red	Red
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies		$ 907,515	$ 719,665
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Plumbers & Pipefitters National Pension Fund
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		52-6152779/001	52-6152779/001	52-6152779/001
Pension Protection Act ("PPA") Certified Zone Status			Yellow	Yellow
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies		$ 817,059	$ 660,324
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Sheet Metal Workers' National Pension Fund
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		52-6112463/001	52-6112463/001	52-6112463/001
Pension Protection Act ("PPA") Certified Zone Status			Yellow	Yellow
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies		$ 188,749	$ 175,643
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Plumbers and Steamfitters Local 577 Pension Fund
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		31-6134953/001	31-6134953/001	31-6134953/001
Pension Protection Act ("PPA") Certified Zone Status			Red	Red
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies		$ 5,623	$ 0
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
All Other
RETIREMENT AND EMPLOYEE BENEFIT PLANS
Pension Protection Act ("PPA") Certified Zone Status			Green	Green
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Multiemployer Plan, Pension, Insignificant, Employer Contribution, Cost		$ 8,978,053	$ 3,611,624

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