Property and Equipment - Component of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Line Items]
Property and equipment	$ 250,896	$ 244,816
Less accumulated depreciation and amortization	146,362	139,412
Property and equipment, net	104,534	105,404
Land and land improvements
Property, Plant and Equipment [Line Items]
Property and equipment	24,566	24,832
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	46,806	48,118
Fleet and Other Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	84,008	79,270
Tanks and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	66,783	63,639
Furniture, Fixtures and Office Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 28,733	$ 28,957