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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Business Combination [Line Items]            
Inventory reserve   $ 4.3   $ 4.3   $ 3.4
Antidilutive shares   0 0 35,153 0  
Tanager Acquisitions Promissory Note            
Business Combination [Line Items]            
Receivable with imputed interest, face amount $ 12.3          
Receivable with imputed interest, term 5 years          
Proceeds from collection of notes receivable       $ 1.0    
Receivable with imputed interest, net amount   $ 11.3   11.3    
Tanager Acquisitions Promissory Note | Other Assets            
Business Combination [Line Items]            
Receivable with imputed interest, net amount   9.8   9.8    
Tanager Acquisitions Promissory Note | Prepaid Expenses and Other Current Assets            
Business Combination [Line Items]            
Receivable with imputed interest, net amount   1.5   1.5    
IronDirect            
Business Combination [Line Items]            
Inventory reserve   $ 1.9   $ 1.9