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Summary of Performance-based Shares Activity (Detail) (USD $)
12 Months Ended
Sep. 30, 2013
Weighted- Average Remaining Contractual Term  
Outstanding at September 30, 2013 5 years 8 months 12 days
Performance Awards
 
Shares  
Beginning balance (526,227)
Granted 230,518 [1]
Vested (271,418)
Unearned 9,928
Forfeited/expired (15,500)
Ending balance (459,899)
Weighted- Average Grant Date Fair Value  
Beginning balance $ 88.56
Granted $ 164.14 [1]
Vested $ 85.87
Unearned $ 85.05
Forfeited/expired $ 129.36
Ending balance $ 126.24
Weighted- Average Remaining Contractual Term  
Outstanding at September 30, 2013 1 year
Aggregate Intrinsic Value  
Outstanding at September 30, 2013 $ 88,000,000 [2]
[1] Represents the maximum number of performance-based shares which could be earned.
[2] Calculated by multiplying the closing stock price on the last trading day of fiscal 2013 of $191.10 by the number of instruments.