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Subsequent Events (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 06, 2017
USD ($)
store
Sep. 30, 2017
USD ($)
store
Sep. 30, 2017
USD ($)
store
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Subsequent Event [Line Items]          
Number of stores | store   786 786    
Payments at closing to acquire business     $ 2,250 $ 6,000 $ 7,802
Camira Administration Corp          
Subsequent Event [Line Items]          
Acquisition related costs   $ 1,200      
Camira Administration Corp | Subsequent event          
Subsequent Event [Line Items]          
Percentage of voting interests acquired 100.00%        
Number of stores | store 112        
Payments at closing to acquire business $ 53,400        
Contingent consideration liability 2,250        
Indebtedness to Members of Seller's Affiliated Group | Camira Administration Corp | Subsequent event          
Subsequent Event [Line Items]          
Proceeds from related party debt $ 6,600