Quarterly report [Sections 13 or 15(d)]

Equity (Details)

v3.25.1
Equity (Details)
 6 Months Ended
Nov. 01, 2024
shares
Mar. 31, 2025
voting_right
shares
Sep. 30, 2024
shares
Class A Common Stock      
Schedule of Stockholders Equity [Line Items]      
Voting rights for each share | voting_right   1  
Conversion rate   1  
Common stock, shares outstanding (in shares)   47,235,345 43,819,102
Treasury stock, shares, acquired (in shares)   146,761  
Class A Common Stock | Restricted Stock | Equity Incentive Plan      
Schedule of Stockholders Equity [Line Items]      
Forfeitures (in shares)   2,145  
Options granted (in shares)   273,995  
Class A Common Stock | Restricted Stock | Equity Incentive Plan | Share-Based Payment Arrangement, Nonemployee      
Schedule of Stockholders Equity [Line Items]      
Restricted shares (in shares)   180,000  
Class A Common Stock | Performance Shares      
Schedule of Stockholders Equity [Line Items]      
Shares issued (in shares)   210,520  
Class A Common Stock | Performance Shares | Share-Based Payment Arrangement, Nonemployee      
Schedule of Stockholders Equity [Line Items]      
Shares issued (in shares)   79,000  
Class A Common Stock | Lone Star Paving      
Schedule of Stockholders Equity [Line Items]      
Business acquisition, restricted shares (in shares) 3,000,000 3,000,000  
Class B Common Stock      
Schedule of Stockholders Equity [Line Items]      
Voting rights for each share | voting_right   10  
Conversion of Class B common stock to Class A common stock (in shares)   154,242  
Common stock, shares outstanding (in shares)   8,813,803 8,861,698
Treasury stock, shares, acquired (in shares)   2,653  
Class B Common Stock | Restricted Stock | Equity Incentive Plan      
Schedule of Stockholders Equity [Line Items]      
Options granted (in shares)   48,000  
Class B Common Stock | Performance Shares      
Schedule of Stockholders Equity [Line Items]      
Shares issued (in shares)   61,000  
Class B Common Stock | Performance Shares | Share-Based Payment Arrangement, Employee      
Schedule of Stockholders Equity [Line Items]      
Shares issued (in shares)   61,000