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Receivables, net - Additional Information (Details)
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Document Period End Date Dec. 31, 2017    
Credit Concentration Risk [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of net sales from major customer 35.10% 35.50%  
Percentage Of Accounts Receivable Three Major Customers 29.30%   36.20%