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Segment Information (Detail) - Major customers (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 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) $ 1.9 $ 5.9 $ 8.0 $ 11.0  
% of Revenues 8.00% 23.00% 18.00% 23.00%  
Customer B
         
Segment Reporting Information [Line Items]          
Accounts Receivable, Gross 13   13   4
Amount (in Dollars) 5.6 4.8 8.9 7.4  
% of Revenues 27.00% 18.00% 21.00% 16.00%  
concentration risk, percentage, accounts receivable 57.00%   57.00%   26.00%
Customer C
         
Segment Reporting Information [Line Items]          
Amount (in Dollars) $ 0 $ 3.0 $ 0 $ 4.2  
% of Revenues 0.00% 12.00% 0.00% 9.00%