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Stock Compensation - Consolidated Stock Compensation Expense (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock compensation $ 61.5 $ 31.2 $ 30.5