Property and Equipment - Component of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Property, Plant and Equipment [Line Items]
Property and equipment	$ 282,870	$ 250,896
Less accumulated depreciation and amortization	154,265	146,362
Property and equipment, net	128,605	104,534
Land and land improvements
Property, Plant and Equipment [Line Items]
Property and equipment	27,654	24,566
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	47,242	46,806
Fleet and Other Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	89,978	84,008
Tanks and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	91,824	66,783
Furniture, Fixtures and Office Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 26,172	$ 28,733