Property and Equipment - Component of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property and equipment	$ 220,220	$ 230,690
Less accumulated depreciation and amortization	126,725	132,451
Property and equipment, net	93,495	98,239
Land and land improvements
Property, Plant and Equipment [Line Items]
Property and equipment	21,626	20,872
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	39,726	37,443
Fleet and Other Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	71,002	73,440
Tanks and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	47,694	50,353
Furniture, Fixtures and Office Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 40,172	$ 48,582