v3.26.1
Business Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2026
Sep. 30, 2025
Business Combination [Line Items]    
Goodwill $ 1,139,332 $ 943,309
Total Acquisitions    
Business Combination [Line Items]    
Cash and cash equivalents 107  
Contracts receivable including retainage 30,282  
Costs and estimated earnings in excess of billings on uncompleted contracts 4,211  
Inventories 11,861  
Prepaid expenses and other current assets 285  
Property, plant and equipment 136,242  
Operating lease right-of-use assets 1,614  
Intangible assets 1,250  
Total assets 185,852  
Accounts payable 16,314  
Billings in excess of costs and estimated earnings on uncompleted contracts 11,527  
Accrued expenses and other current liabilities 3,735  
Operating lease liabilities 1,614  
Total liabilities 33,190  
Goodwill 196,505  
Total cash consideration transferred 297,035  
Fair value of Class A common stock transferred 51,459  
Total consideration payable 673  
Total purchase price 349,167  
VMC    
Business Combination [Line Items]    
Cash and cash equivalents 0  
Contracts receivable including retainage 0  
Costs and estimated earnings in excess of billings on uncompleted contracts 88  
Inventories 10,790  
Prepaid expenses and other current assets 0  
Property, plant and equipment 59,915  
Operating lease right-of-use assets 797  
Intangible assets 1,000  
Total assets 72,590  
Accounts payable 0  
Billings in excess of costs and estimated earnings on uncompleted contracts 1,397  
Accrued expenses and other current liabilities 1,279  
Operating lease liabilities 797  
Total liabilities 3,473  
Goodwill 38,607  
Total cash consideration transferred 107,724  
Fair value of Class A common stock transferred 0  
Total consideration payable 0  
Total purchase price 107,724  
P&S    
Business Combination [Line Items]    
Cash and cash equivalents 107  
Contracts receivable including retainage 15,831  
Costs and estimated earnings in excess of billings on uncompleted contracts 753  
Inventories 751  
Prepaid expenses and other current assets 285  
Property, plant and equipment 44,129  
Operating lease right-of-use assets 0  
Intangible assets 250  
Total assets 62,106  
Accounts payable 6,025  
Billings in excess of costs and estimated earnings on uncompleted contracts 8,051  
Accrued expenses and other current liabilities 1,567  
Operating lease liabilities 0  
Total liabilities 15,643  
Goodwill 98,287  
Total cash consideration transferred 93,291  
Fair value of Class A common stock transferred 51,459  
Total consideration payable 0  
Total purchase price 144,750  
GMJ    
Business Combination [Line Items]    
Cash and cash equivalents 0  
Contracts receivable including retainage 8,894  
Costs and estimated earnings in excess of billings on uncompleted contracts 2,253  
Inventories 320  
Prepaid expenses and other current assets 0  
Property, plant and equipment 16,801  
Operating lease right-of-use assets 817  
Intangible assets 0  
Total assets 29,085  
Accounts payable 7,052  
Billings in excess of costs and estimated earnings on uncompleted contracts 1,594  
Accrued expenses and other current liabilities 274  
Operating lease liabilities 817  
Total liabilities 9,737  
Goodwill 18,680  
Total cash consideration transferred 37,903  
Fair value of Class A common stock transferred 0  
Total consideration payable 125  
Total purchase price 38,028  
Four Star    
Business Combination [Line Items]    
Cash and cash equivalents 0  
Contracts receivable including retainage 5,557  
Costs and estimated earnings in excess of billings on uncompleted contracts 1,117  
Inventories 0  
Prepaid expenses and other current assets 0  
Property, plant and equipment 15,397  
Operating lease right-of-use assets 0  
Intangible assets 0  
Total assets 22,071  
Accounts payable 3,237  
Billings in excess of costs and estimated earnings on uncompleted contracts 485  
Accrued expenses and other current liabilities 615  
Operating lease liabilities 0  
Total liabilities 4,337  
Goodwill 40,931  
Total cash consideration transferred 58,117  
Fair value of Class A common stock transferred 0  
Total consideration payable 548  
Total purchase price $ 58,665