Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions - Narrative (Details)

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Business Acquisitions - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 03, 2024
USD ($)
May 01, 2024
USD ($)
Jan. 02, 2024
USD ($)
Dec. 29, 2023
USD ($)
Nov. 01, 2023
USD ($)
plant
Oct. 02, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Business Acquisition [Line Items]                  
Goodwill             $ 200,333 $ 200,333 $ 159,270
Revenues since acquisition date             38,500 60,600  
Net income             2,500 1,300  
Expenses and losses recognized             700 1,500  
Acquisition related costs               1,500  
Georgia Acquisition                  
Business Acquisition [Line Items]                  
Asset acquisition, consideration transferred $ 18,700   $ 6,500            
Sunbelt Asphalt Surfaces, Inc. Acquisition                  
Business Acquisition [Line Items]                  
Asset acquisition, consideration transferred   $ 28,700              
South Carolina Acquisition                  
Business Acquisition [Line Items]                  
Consideration transferred           $ 3,000      
North Carolina and South Carolina Acquisitions November 2023                  
Business Acquisition [Line Items]                  
Consideration transferred         $ 18,300        
Plants acquired | plant         3        
Alabama Acquisition                  
Business Acquisition [Line Items]                  
Consideration transferred       $ 54,300          
2024 Acquisitions                  
Business Acquisition [Line Items]                  
Consideration transferred               129,500  
Goodwill             39,600 39,600  
Cash payment to acquire business               135,300  
Cash received related to settlement of working capital provisions               5,800  
Net working capital               13,000  
Property, plant and equipment allocation             76,200 76,200  
Goodwill and intangibles             $ 40,300 $ 40,300