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Segment Information (Detail) - Major customers (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Segment Reporting Information [Line Items]          
Segment Reporting, Disclosure of Major Customers     0.1    
Customer A
         
Segment Reporting Information [Line Items]          
Amount (in Dollars) $ 3.7 $ 1.3 $ 11.8 $ 12.2  
% of Revenues 17.00% 7.00% 18.00% 19.00%  
Customer B
         
Segment Reporting Information [Line Items]          
Accounts Receivable, Gross 3   3   4
Amount (in Dollars) 3.6 2.6 12.5 9.9  
% of Revenues 16.00% 14.00% 19.00% 15.00%  
concentration risk, percentage, accounts receivable 20.00%   20.00%   26.00%
Customer C
         
Segment Reporting Information [Line Items]          
Amount (in Dollars) $ 0 $ 3.8 $ 0 $ 8.0  
% of Revenues 0.00% 20.00% 0.00% 12.00%