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Segment Information (Detail) - Major customers - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
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) $ 3.7 $ 5.6 $ 6.6 $ 8.4  
% of Total Revenues 15.00% 20.00% 14.00% 17.00%  
Accounts Receivable, Gross $ 1.7   $ 1.7   $ 3.0
concentration risk, percentage, accounts receivable 7.00%   7.00%   15.00%
Customer B          
Segment Reporting Information [Line Items]          
Amount (in Dollars) $ 3.8 $ 3.8 $ 6.0 $ 7.6  
% of Total Revenues 15.00% 14.00% 13.00% 15.00%  
Accounts Receivable, Gross $ 8.7   $ 8.7   $ 2.5
concentration risk, percentage, accounts receivable 36.00%   36.00%   13.00%