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Share-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Installment
Sep. 30, 2011
Sep. 30, 2010
Stock Based Compensation Activity [Line Items]      
Income tax benefit recognized $ 32,075 $ 26,342 $ 28,532
SARs Vesting Period 4 years    
SARs Terms of Award 10 years    
Total intrinsic value of SARs exercised 3,934 9,185 2,831
Stock Issued under SARs Exercised 51,594    
Actual tax benefit realized For tax deductions from SAR 2,866 3,459 1,031
Total fair value of SARs vested 36,512 31,992 33,640
Outstanding stock options term of award Ten year    
Cash received from the exercising of stock options 52,470 103,267 72,770
Actual tax benefit realized for tax deductions from stock option exercises 11,944 45,829 28,660
Total intrinsic value of stock options exercised 57,907 137,720 89,943
Stock Units Vesting Period 3 years    
Share based compensation arrangement by share based payment award The actual payout under these awards may vary from zero to 200% of an employee's target payout, based on the Company's actual performance over the three-year performance period.    
Unrecognized compensation expense for all non-vested share-based awards 94,744    
Weighted-average remaining life non-vested share-based awards 1 year 11 months 16 days    
Shares were authorized for future grants 5,776,296    
Distribution of each award is deferred until after retirement or involuntary termination 25% or more    
Number of equal installments in which deferred portion of stock award is distributable 5    
Period over which balance of stock award distributable, (years) 5 years    
Outstanding shares under other stock plan. 88,692 97,705  
Shares held in trust 99,557    
Shares represented Directors compensation in 2011 5,414    
Shares issuable under deferred compensation plan 440,451    
Performance Based Restricted Share Units [Member]
     
Stock Based Compensation Activity [Line Items]      
Granted, stock units weighted average grant date fair value   $ 76.64 $ 75.63
Total fair value of restricted stock units 7,358 15,430 24,357
Weighted average remaining vesting term 11 months 19 days    
Time-Vested Restricted Stock Units [Member]
     
Stock Based Compensation Activity [Line Items]      
Granted, stock units weighted average grant date fair value $ 72.27 $ 76.97 $ 75.58
Total fair value of restricted stock units $ 38,105 $ 36,009 $ 36,675
Weighted average remaining vesting term 1 year 5 months 9 days