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Organization and Summary of Significant Accounting Policies - Inventory and Cash and Cash Equivalents and Cash Concentrations (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 17, 2025
store
Sep. 30, 2025
USD ($)
store
Sep. 30, 2025
USD ($)
store
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Inventory [Line Items]          
Inventory, net   $ 248,457 $ 248,457 $ 191,923  
Long-term restricted cash   14,664 14,664 0 $ 0
Short-term restricted cash   525 525 9,294 $ 8,373
PLO del Bajio S. de. R.L. de C.V.          
Inventory [Line Items]          
Short-term restricted cash       500  
Monte Providencia and Tu Empeno Efectivo          
Inventory [Line Items]          
Long-term restricted cash   $ 5,400 $ 5,400    
Number of stores acquired | store 40 7 47    
Monte Providencia and Tu Empeno Efective and PLO del Bajo S. De. R.L. de C.V.          
Inventory [Line Items]          
Number of stores acquired | store     47    
Short-term restricted cash   $ 500 $ 500    
Grupo Finmart          
Inventory [Line Items]          
Long-term restricted cash   9,300 9,300    
Short-term restricted cash       8,800  
Mexico | Foreign | Reportable geographical components          
Inventory [Line Items]          
Inventory, net   $ 49,100 $ 49,100 $ 42,200