Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions - Additional Information (Detail)

v3.20.2
Business Acquisitions - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 23, 2020
USD ($)
plant
Oct. 01, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]          
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      
Goodwill acquired   $ 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