Acquisitions - Additional Information (Details) - Monte Providencia and Tu Empeno Efectivo $ in Millions		3 Months Ended		12 Months Ended
	Jun. 17, 2025 USD ($) state store	Sep. 30, 2025 store	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($) store
Business Combination [Line Items]
Number of stores acquired | store	40	7		47
Aggregate purchase price	$ 20.3
Amount payable over next five years	5.4
Measurement period adjustments	$ 0.5
Business combination, revenue of acquiree since acquisition date			$ 4.8
Income before tax			$ 0.9
Acquisition related costs				$ 0.3
MEXICO
Business Combination [Line Items]
Number of states | state	13