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Acquisitions - Additional Information Regarding Recent Acquisitions (Details)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 25, 2018
store
Jun. 11, 2018
state
store
Dec. 04, 2017
store
Oct. 06, 2017
USD ($)
store
Jan. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Business Acquisition [Line Items]              
Acquisition related costs             $ 600
GPMX              
Business Acquisition [Line Items]              
Percentage acquired       100.00%      
Number of stores acquired | store       112      
Cash payments for acquisition       $ 53,400 $ 1,600 $ 6,700  
Contingent consideration       $ 2,250      
Duration of performance period tied to contingent consideration       24 months      
Aggregate purchase price       $ 61,700      
All Other              
Business Acquisition [Line Items]              
Number of stores acquired | store 40 23 21        
Number of states in which entity operates | state   7