RETIREMENT AND EMPLOYEE BENEFIT PLANS - Summary of Participation in Pension Fund Plan (Details) - USD ($)		12 Months Ended
Dec. 15, 2021	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
RETIREMENT AND EMPLOYEE BENEFIT PLANS
Multiemployer plan, employer contribution, cost, Total		$ 10,154,635	$ 9,983,684
Payments for installment	$ 41,000
Amount expensed		$ 0	$ 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			Green	Green
Contributions of Energy Services Companies		$ 121,801	$ 197,890
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		$ 1,085,378	$ 220,354
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			$ 4,026
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		$ 151,448	$ 50,666
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			Green	Green
Contributions of Energy Services Companies		$ 381,313	$ 570,197
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Carpenters Pension Fund of WV (Greater Pennsylvania Carpenters' Pension Fund 25-6135570/001)
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			Yellow	Yellow
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies		$ 346,464	$ 871,079
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Plumbers & Pipefitters National Pension Fund (United Association 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			Green	Green
Contributions of Energy Services Companies		$ 2,200,593	$ 1,964,549
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			Green	Green
Contributions of Energy Services Companies		$ 617,501	$ 370,727
Surcharge Imposed		No	No	No
Expiration Date of Collective Bargaining Agreement		Various	Various	Various
Sheet Metal Workers Local Pension Fund
RETIREMENT AND EMPLOYEE BENEFIT PLANS
EIN/Pension Plan Number		34-6666753/001	34-6666753/001	34-6666753/001
Pension Protection Act ("PPA") Certified Zone Status			Red	Red
FIP/RP Status		Implemented	Implemented	Implemented
Contributions of Energy Services Companies			$ 4,716
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		$ 5,250,137	$ 5,729,480

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The amount of cash paid for installment.

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Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

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Indicates whether funding improvement plan or rehabilitation plan was implemented or pending for multiemployer pension plan, determined to be individually significant. Acceptable values are "No", "Pending", "Implemented", "Other", and "NA".

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Indicates whether employer paid surcharge to multiemployer pension plan determined to be individually significant. Acceptable values are "No", "Yes", and "NA".

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Description of the significant collective-bargaining arrangements within the range of expiration dates for collective-bargaining arrangements requiring contributions to a multiemployer plan as well as other information to help investors understand the significance of the collective-bargaining agreements and when they expire. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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