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Segment Information (Detail) - Major customers - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Segment Reporting Information [Line Items]      
Segment Reporting, Disclosure of Major Customers 0.1 .1  
percent of accounts receivable 10.00% 10.00%  
Customer A      
Segment Reporting Information [Line Items]      
Amount (in Dollars) $ 1.2 $ 2.9  
% of Total Revenues 6.00% 14.00%  
Accounts Receivable, Gross $ 1.0   $ 2.4
concentration risk, percentage, accounts receivable 5.00%   9.00%
Customer B      
Segment Reporting Information [Line Items]      
Amount (in Dollars) $ 2.5 $ 2.1  
% of Total Revenues 11.00% 11.00%  
Accounts Receivable, Gross $ 3.3   $ 3.9
concentration risk, percentage, accounts receivable 16.00%   14.00%
Customer C [Member]      
Segment Reporting Information [Line Items]      
Accounts Receivable, Gross $ 2.8    
concentration risk, percentage, accounts receivable 13.00%    
Customer D [Member]      
Segment Reporting Information [Line Items]      
Accounts Receivable, Gross $ 2.3    
concentration risk, percentage, accounts receivable 11.00%