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Summary of Activity Relating to Restricted Units (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Jun. 30, 2012
Year
Number of Shares Underlying Restricted Units - Contingent Awards
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at September 30, 2011 2,955,179
Granted 2,871,250
Earned/released (1,057,207)
Forfeited (310,437)
Outstanding at June 30, 2012 4,458,785
Weighted average remaining contractual term of outstanding Restricted Units 1 year 3 months 18 days
Aggregate intrinsic value of outstanding Restricted Units $ 106.2 [1]
Restricted Units vested and expected to vest 4,207,597
Weighted average remaining contractual term of Restricted Units vested and expected to vest 1.3
Aggregate intrinsic value of Restricted Units vested and expected to vest 100.2 [1]
Number of Shares Underlying Restricted Units - Time-Based Awards
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at September 30, 2011 7,286,118
Granted 5,821,451
Earned/released (3,312,350)
Forfeited (332,636)
Outstanding at June 30, 2012 9,462,583
Weighted average remaining contractual term of outstanding Restricted Units 1 year 2 months 12 days
Aggregate intrinsic value of outstanding Restricted Units 225.5 [1]
Restricted Units vested and expected to vest 8,486,604
Weighted average remaining contractual term of Restricted Units vested and expected to vest 1.1
Aggregate intrinsic value of Restricted Units vested and expected to vest $ 202.1 [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, 2012 ($23.82) and the exercise price of the underlying Restricted Units.