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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, 2011
Year
Number of Shares Underlying Restricted Units Contingent Awards
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at September 30, 2010 2,867,840
Granted 1,329,988
Earned/released (1,296,018)
Forfeited (360,009)
Outstanding at June 30, 2011 2,541,801
Weighted average remaining contractual term of outstanding Restricted Units 1.0
Aggregate intrinsic value of outstanding Restricted Units $ 54.6 [1]
Restricted Units vested and expected to vest 2,383,251
Weighted average remaining contractual term of Restricted Units vested and expected to vest 1.0
Aggregate intrinsic value of Restricted Units vested and expected to vest 51.2 [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, 2010 7,795,114
Granted 3,521,636
Earned/released (3,273,826)
Forfeited (557,123)
Outstanding at June 30, 2011 7,485,801
Weighted average remaining contractual term of outstanding Restricted Units 1.1
Aggregate intrinsic value of outstanding Restricted Units 160.7 [1]
Restricted Units vested and expected to vest 6,961,901
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 $ 149.5 [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, 2011 ($21.47) and the exercise price of the underlying Restricted Units.