Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment (Detail)

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Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 28, 2019
Sep. 30, 2019
Sep. 30, 2018
Property, Plant and Equipment [Abstract]      
Depreciation, depletion and amortization expense   $ 30,100 $ 24,800
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross   383,279 338,118
Accumulated depreciation, depletion and amortization   (177,927) (160,795)
Construction in progress   518 1,369
Total property, plant and equipment, net   205,870 178,692
Equipment      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross   214,500 190,420
Asphalt plants      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross   92,279 79,563
Land and improvements      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross   34,365 29,624
Quarry reserves      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross   20,678 20,908
Buildings      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross   15,458 12,416
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross   4,864 4,422
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross   $ 1,135 $ 765
Asphalt Terminal      
Property, Plant and Equipment [Line Items]      
Payments for asset acquisitions $ 10,900    
Asset acquisition, transaction costs $ 100