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Segment Information (Detail) - Major customers - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Segment Reporting Information [Line Items]          
Segment Reporting, Disclosure of Major Customers 0.1 .1   .1  
percent of accounts receivable     10.00% 10.00%  
Customer A          
Segment Reporting Information [Line Items]          
Amount (in Dollars) $ 1.6 $ 8.2 $ 5.5 $ 14.8  
% of Total Revenues 8.00% 31.00% 10.00% 25.00%  
Accounts Receivable, Gross $ 1.5   $ 1.5   $ 2.4
concentration risk, percentage, accounts receivable 11.00%   11.00%   14.00%
Customer B          
Segment Reporting Information [Line Items]          
Amount (in Dollars) $ 1.0 $ 3.0 $ 2.2 $ 4.5  
% of Total Revenues 5.00% 11.00% 4.00% 7.00%  
Customer C [Member]          
Segment Reporting Information [Line Items]          
Accounts Receivable, Gross $ 1.6   $ 1.6    
concentration risk, percentage, accounts receivable 13.00%   13.00%