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Acquisitions (Details)
$ in Millions
12 Months Ended
Sep. 30, 2019
Business
Sep. 30, 2018
USD ($)
store
Sep. 30, 2017
Business
Acquisitions      
Number of businesses acquired | Business 0   0
Chalut      
Acquisitions      
Number of beauty supply stores | store   21  
Cost of acquisition   $ 8.8  
Intangible assets subject to amortization   4.7  
Goodwill expected to be deducted for tax purposes   $ 0.7