Organization and Summary of Significant Accounting Policies - Inventory and Cash and Cash Equivalents and Cash Concentrations (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Inventory [Line Items]
Inventory, net	$ 166,477	$ 151,615
Bajio
Inventory [Line Items]
Business acquisition, final consideration payable on fifth anniversary of acquisition	300
Grupo Finmart
Inventory [Line Items]
Escrow deposit	8,100
Mexico | Foreign | Reportable geographical components
Inventory [Line Items]
Inventory, net	$ 31,400	$ 29,800