Business Combinations - Narrative (Details) $ in Millions						12 Months Ended
	Apr. 30, 2021 numberOfFormerFranchiseCenters	Dec. 11, 2020 numberOfFormerFranchiseCenters States	Oct. 30, 2020 service_center_store	Oct. 15, 2020 numberOfFormerFranchiseCenters	Oct. 01, 2020 service_center_store	Sep. 30, 2023 USD ($) service_center_store stores	Sep. 30, 2022 USD ($) service_center_store numberOfFormerFranchiseCenters	Sep. 30, 2021 USD ($) service_center_store	Sep. 30, 2021 USD ($) numberOfFormerFranchiseCenters
Business Acquisition [Line Items]
Number of service center stores acquired in single and multi-store transactions | service_center_store						31
Purchase price | $						$ 36.3
Number of stores | stores						1,852
Number of service center stores							37	134	11
Number of former franchise service center stores acquired	16						4		13
Aggregate purchase price | $						$ 36.3	$ 50.7	$ 281.7	$ 281.7
Number of former franchise locations converted to company-operated service centers stores									50
Number of franchise service center stores acquired									12
Business acquisition, number of former joint venture locations									14
Express Care
Business Acquisition [Line Items]
Number of service center stores | service_center_store							5	6
Kent Lubrication Centers Ltd.
Business Acquisition [Line Items]
Number of service center stores | service_center_store					14
Westco Lube, Inc
Business Acquisition [Line Items]
Number of former franchise service center stores acquired				21
L&F Enterprises
Business Acquisition [Line Items]
Number of service center stores | service_center_store			12
Car Wash Partners, Inc
Business Acquisition [Line Items]
Number of service center stores acquired in single and multi-store transactions		15
Number of service center stores		27
Number of franchise service center stores acquired		12
Business acquisition, number of states in which service center stores acquired | States		7