Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions - Additional Information (Detail)

v3.20.1
Business Acquisitions - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 23, 2020
USD ($)
plant
Oct. 01, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]            
Consideration transferred, liabilities accrued       $ 2,642 $ 0  
Goodwill allocation     $ 46,348 46,348   $ 38,546
Number of manufacturing plants | plant 2          
HMA Manufacturing Plant and Paving Company            
Business Acquisition [Line Items]            
Cash payment to acquire business   $ 17,700        
Property, plant and equipment allocation   9,600        
Other current assets allocation   400        
Goodwill allocation   $ 7,700        
Acquisition related costs       100    
Two HMA Manufacturing Plants            
Business Acquisition [Line Items]            
Cash payment to acquire business $ 9,800          
Consideration transferred, liabilities accrued 2,600          
Property, plant and equipment allocation 9,700          
Other current assets allocation 2,600          
Goodwill allocation $ 100          
Acquisition related costs     $ 100 $ 100