Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment - Narrative (Details)

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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Property, Plant and Equipment [Line Items]          
Depreciation, depletion and amortization expense       $ 14,639 $ 11,308
Asphalt Terminal          
Property, Plant and Equipment [Line Items]          
Purchase price $ 10,800        
Acquisition costs incurred $ 100        
Depreciation, depletion and amortization expense   $ 7,300 $ 5,600 $ 14,200 $ 11,200