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Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Cash and Cash Equivalents      
Minimum period in which customer credit and debit card transactions are settled 1 day    
Maximum period in which customer credit and debit card transactions are settled 3 days    
Proceeds due from customers of credit and debit card and PayPal transactions $ 15.1 $ 13.3  
Inventory      
Average approximate inventory shrinkage, as percentage of consolidated net sales 1.00% 1.00% 1.00%