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Debt (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Apr. 28, 2022
Debt Disclosure [Abstract]        
Long-Term Debt $ 0 $ 81,628,000    
Long-term debt 0 81,628,000    
Debt Issuance Costs, Noncurrent, Net 836,000 1,031,000    
Letters of Credit Outstanding, Amount 4,166,000      
Line of Credit Facility, Remaining Borrowing Capacity $ 142,761,000      
Line of Credit Facility, Interest Rate at Period End 6.82%      
Interest expense $ 3,022,000 2,970,000 $ 962,000  
Line of Credit Facility, Maximum Borrowing Capacity 150,000,000     $ 125,000,000
Loans Payable $ 0      
ControllingShareholderOwnershipPercentage 58.00%      
Liquidity $ 218,531,000      
Long-Term Line of Credit 0 82,659,000    
Debt Issuance Costs, Net $ 0 (1,031,000)    
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. $ 108,288,000 $ 34,762,000 $ 66,658,000  
Fixed Charge Coverage Ratio, Maximum 630.00%