Annual report pursuant to Section 13 and 15(d)

Business Acquisitions - Narrative (Details)

v3.20.2
Business Acquisitions - Narrative (Details)
$ in Thousands
 12 Months Ended
Mar. 23, 2020
USD ($)
plant
Oct. 01, 2019
USD ($)
Jul. 12, 2019
USD ($)
Feb. 28, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Business Acquisition [Line Items]              
Additions         $ 7,802 $ 5,627  
Number of manufacturing plants | plant 2            
Goodwill         46,348 38,546 $ 32,919
Pro forma revenue         793,700 $ 831,800  
HMA - Alabama              
Business Acquisition [Line Items]              
Cash payment to acquire business     $ 5,000        
Additions     $ 2,400        
General and administrative expenses         100    
HMA Manufacturing Plant And Paving Company              
Business Acquisition [Line Items]              
Cash payment to acquire business   $ 17,700          
Additions   $ 7,700          
General and administrative expenses         100    
Two HMA Manufacturing Plants              
Business Acquisition [Line Items]              
Cash payment to acquire business $ 9,800            
General and administrative expenses         100    
Liabilities incurred 2,700            
Goodwill $ 100            
HMA - Florida              
Business Acquisition [Line Items]              
Cash payment to acquire business       $ 8,900      
Additions       3,200      
General and administrative expenses       $ 100      
All Acquisitions for Fiscal Year              
Business Acquisition [Line Items]              
Goodwill         7,800    
Consideration transferred         30,200    
Inventory assumed         3,100    
Property, plant, and equipment assumed         19,300    
Revenues since acquisition date         $ 42,900