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Segment Information (Detail) - Major customers - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Segment Reporting Information [Line Items]          
Segment Reporting, Disclosure of Major Customers     0.1 .1  
Customer A          
Segment Reporting Information [Line Items]          
Amount (in Dollars) $ 5.6 $ 2.4 $ 8.4 $ 4.7  
% of Total Revenues 20.00% 13.00% 17.00% 12.00%  
Customer B          
Segment Reporting Information [Line Items]          
Amount (in Dollars) $ 3.8 $ 3.7 $ 7.6 $ 6.6  
% of Total Revenues 14.00% 20.00% 15.00% 17.00%  
Accounts Receivable, Gross $ 5.0   $ 5.0   $ 8.0
concentration risk, percentage, accounts receivable 33.00%   33.00%   39.00%