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Contingencies (Details) (Net sales, Major Customers, American Airlines, Inc. ("AAI"))
3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Net sales | Major Customers | American Airlines, Inc. ("AAI")
       
Legal Proceedings        
Concentration of risk (as a percent) 19.00% 1.00% 16.00% 8.00%