Annual report pursuant to Section 13 and 15(d)

Business Acquisitions - Assets Acquired and Liabilities Assumed (Detail)

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Business Acquisitions - Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Business Acquisition [Line Items]      
Goodwill $ 159,270 $ 129,465 $ 85,422
2023 Acquisitions      
Business Acquisition [Line Items]      
Cash and cash equivalents 33    
Contracts receivable including retainage 12,991    
Cost and estimated earnings in excess of billings on uncompleted contracts 598    
Inventories 3,088    
Prepaid expenses and other current assets 799    
Property, plant and equipment 45,937    
Operating lease right-of-use assets 433    
Intangible assets 5,900    
Total assets 69,779    
Accounts payable 3,718    
Billings in excess of costs and estimated earnings on uncompleted contracts 2,329    
Accrued expenses and other current liabilities 895    
Operating lease liabilities 433    
Total liabilities 7,375    
Goodwill 29,589    
Total purchase price 91,993    
Alabama Acquisition      
Business Acquisition [Line Items]      
Cash and cash equivalents 0    
Contracts receivable including retainage 0    
Cost and estimated earnings in excess of billings on uncompleted contracts 0    
Inventories 0    
Prepaid expenses and other current assets 0    
Property, plant and equipment 1,004    
Operating lease right-of-use assets 0    
Intangible assets 0    
Total assets 1,004    
Accounts payable 0    
Billings in excess of costs and estimated earnings on uncompleted contracts 0    
Accrued expenses and other current liabilities 0    
Operating lease liabilities 0    
Total liabilities 0    
Goodwill 117    
Total purchase price 1,121    
North Carolina Acquisition      
Business Acquisition [Line Items]      
Cash and cash equivalents 33    
Contracts receivable including retainage 12,216    
Cost and estimated earnings in excess of billings on uncompleted contracts 598    
Inventories 1,314    
Prepaid expenses and other current assets 421    
Property, plant and equipment 27,375    
Operating lease right-of-use assets 0    
Intangible assets 5,900    
Total assets 47,857    
Accounts payable 3,718    
Billings in excess of costs and estimated earnings on uncompleted contracts 2,329    
Accrued expenses and other current liabilities 787    
Operating lease liabilities 0    
Total liabilities 6,834    
Goodwill 26,281    
Total purchase price 67,304    
Upstate South Carolina Acquisition (Provisional)      
Business Acquisition [Line Items]      
Cash and cash equivalents 0    
Contracts receivable including retainage 775    
Cost and estimated earnings in excess of billings on uncompleted contracts 0    
Inventories 189    
Prepaid expenses and other current assets 137    
Property, plant and equipment 3,196    
Operating lease right-of-use assets 433    
Intangible assets 0    
Total assets 4,730    
Accounts payable 0    
Billings in excess of costs and estimated earnings on uncompleted contracts 0    
Accrued expenses and other current liabilities 108    
Operating lease liabilities 433    
Total liabilities 541    
Goodwill 774    
Total purchase price 4,965    
Coastal South Carolina Acquisition      
Business Acquisition [Line Items]      
Cash and cash equivalents 0    
Contracts receivable including retainage 0    
Cost and estimated earnings in excess of billings on uncompleted contracts 0    
Inventories 484    
Prepaid expenses and other current assets 0    
Property, plant and equipment 6,191    
Operating lease right-of-use assets 0    
Intangible assets 0    
Total assets 6,675    
Accounts payable 0    
Billings in excess of costs and estimated earnings on uncompleted contracts 0    
Accrued expenses and other current liabilities 0    
Operating lease liabilities 0    
Total liabilities 0    
Goodwill 2,407    
Total purchase price 9,080    
Tennessee Acquisition      
Business Acquisition [Line Items]      
Cash and cash equivalents 0    
Contracts receivable including retainage 0    
Cost and estimated earnings in excess of billings on uncompleted contracts 0    
Inventories 1,101    
Prepaid expenses and other current assets 241    
Property, plant and equipment 8,171    
Operating lease right-of-use assets 0    
Intangible assets 0    
Total assets 9,513    
Accounts payable 0    
Billings in excess of costs and estimated earnings on uncompleted contracts 0    
Accrued expenses and other current liabilities 0    
Operating lease liabilities 0    
Total liabilities 0    
Goodwill 10    
Total purchase price 9,523    
2022 Acquisitions      
Business Acquisition [Line Items]      
Cash and cash equivalents 1,168 1,168  
Contracts receivable including retainage 9,016 9,016  
Cost and estimated earnings in excess of billings on uncompleted contracts 125 125  
Inventories 2,980 2,980  
Prepaid expenses and other current assets 239 213  
Property, plant and equipment 80,291 80,291  
Deferred tax assets 3,356 2,471  
Intangible assets 9,000 9,000  
Total assets 106,175 105,264  
Accounts payable 2,759 2,759  
Billings in excess of costs and estimated earnings on uncompleted contracts 3,677 3,123  
Accrued expenses and other current liabilities 8,631 6,100  
Unfavorable contract liabilities 8,500 7,900  
Deferred tax liabilities 282 282  
Total liabilities 23,849 20,164  
Goodwill 47,899 45,300  
Total purchase price $ 130,225 $ 130,400