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Acquisitions and Divestitures - Narrative (Details)
$ in Millions
12 Months Ended
Apr. 30, 2021
numberOfFormerFranchiseCenters
Dec. 11, 2020
numberOfFormerFranchiseCenters
service_center_store
Oct. 30, 2020
numberOfFormerFranchiseCenters
Oct. 15, 2020
numberOfFormerFranchiseCenters
Oct. 01, 2020
numberOfFormerFranchiseCenters
Oct. 31, 2018
numberOfFranchiseServiceCenters
Sep. 30, 2021
USD ($)
Service_Center
numberOfFormerFranchiseCenters
service_center_store
locations
Sep. 30, 2020
USD ($)
service_center_store
numberOfFormerFranchiseCenters
Sep. 30, 2019
USD ($)
service_center_store
numberOfFormerFranchiseCenters
Sep. 30, 2021
numberOfFormerFranchiseCenters
Business Acquisition [Line Items]                    
Number of service center stores | service_center_store             11 35 60  
Purchase price | $             $ 282 $ 40 $ 78  
Number of former franchise service center stores acquired 16           13 23 5  
Number of service center stores acquired in single and multi-store transactions             134   24  
Business Disposition, Number of Service Centers Sold             12 6    
Number of Stores             1,600     1,600
Number of Company Owned Stores             700      
Business Acquisition, Number of Former Joint Venture Locations | locations             14      
Oil Changers, Inc.                    
Business Acquisition [Line Items]                    
Number of franchise service center stores acquired | numberOfFranchiseServiceCenters           31        
L&F Enterprises                    
Business Acquisition [Line Items]                    
Number of service center stores     12              
Car Wash Partners, Inc                    
Business Acquisition [Line Items]                    
Number of service center stores   27                
Number of franchise service center stores acquired   12                
Number of service center stores acquired in single and multi-store transactions   15                
Business Acquisition, Number of States in Which Service Center Stores Acquired | service_center_store   7                
Kent Lubrication Centers Ltd.                    
Business Acquisition [Line Items]                    
Number of service center stores         14          
Westco Lube, Inc                    
Business Acquisition [Line Items]                    
Number of former franchise service center stores acquired       21            
Express Care                    
Business Acquisition [Line Items]                    
Number of service center stores | service_center_store             6