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Debt (Details) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Apr. 28, 2022
Debt Disclosure [Abstract]        
Long-term debt $ 0 $ 0    
Debt Issuance Costs, Noncurrent, Net 598,000 836,000    
Letters of Credit Outstanding, Amount 4,756,000      
Line of Credit Facility, Remaining Borrowing Capacity $ 143,381,000      
Line of Credit Facility, Interest Rate at Period End 6.33%      
Interest expense $ 1,338,000 3,022,000 $ 2,970,000  
Line of Credit Facility, Maximum Borrowing Capacity 150,000,000     $ 125,000,000
Loans Payable $ 0 0    
ControllingShareholderOwnershipPercentage 55.00%      
Liquidity $ 244,213,000      
Fixed Charge Coverage Ratio, Minimum (110.00%)      
Line of Credit Facility [Line Items]        
Line of Credit Facility, Covenant Terms, Minimum Liquidity Percentage 10.00%      
Line of Credit Facility, Covenant Terms, Minimum Liquidity Amount $ 15,000,000      
Line of Credit Facility, Covenant Terms, Minimum Liquidity Excess Availability Percentage 50.00%      
Fixed Charge Coverage Ratio, Minimum 110.00%      
Net income (loss) attributable to IES Holdings, Inc. $ 219,116,000 108,288,000 $ 34,762,000  
Fixed Charge Coverage Ratio, Maximum 340.00%      
Loans Payable $ 0 $ 0