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Stock-Based Compensation (Summary of Activity Relating to Restricted Units) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Jun. 30, 2013
Number of Shares Underlying Restricted Units — Contingent Awards
 
Restricted Units, Outstanding [Roll Forward]  
Outstanding at September 30, 2012 4,670,280
Granted 2,781,691
Earned/released (1,665,758)
Forfeited (381,375)
Outstanding at June 30, 2013 5,404,838
Weighted average remaining recognition period of outstanding Restricted Units 2 years 0 months
Unearned stock-based compensation expense of outstanding Restricted Units $ 75.1
Aggregate intrinsic value of outstanding Restricted Units 99.4 [1]
Number of Shares Underlying Restricted Units — Time-Based Awards
 
Restricted Units, Outstanding [Roll Forward]  
Outstanding at September 30, 2012 7,740,612
Granted 7,185,971
Earned/released (4,364,565)
Forfeited (519,249)
Outstanding at June 30, 2013 10,042,769
Weighted average remaining recognition period of outstanding Restricted Units 1 year 11 months
Unearned stock-based compensation expense of outstanding Restricted Units 142.9
Aggregate intrinsic value of outstanding Restricted Units $ 184.8 [1]
[1] The aggregate intrinsic value in this table was calculated based on the positive difference between the closing market value of our common stock on June 30, 2013 ($18.40) and the purchase price of the underlying Restricted Units.