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Share-Based Compensation - Summary of Performance-Based Restricted Stock Units Outstanding (Detail) - $ / shares
shares in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Percentage of Target Payout on which Performance Based Time-vested Restricted Stock Units are Based 100.00%    
Expected forfeited performance-based restricted stock units (shares) 66    
Units In Excess Of Expected Performance Payout 655    
Performance-Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Stock units, beginning balance (shares) 955    
Granted, sock units (shares) 371    
Distributed, stock units (shares) (77)    
Forfeited, canceled or expired, stock units (shares) (286)    
Stock units, ending balance (shares) 962 955  
Stock units, vested and expected to vest at ending balance (shares) 241    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Stock units exercise price, beginning balance (USD per share) $ 221.73    
Granted, stock units weighted average grant date fair value (USD per share) 245.06 $ 237.55 $ 251.75
Distributed, stock units exercise price (USD per share) 174.92    
Forfeited, canceled or expired, stock units exercise price (USD per share) 188.32    
Stock units exercise price, ending balance (USD per share) 244.42 $ 221.73  
Stock units, vested and expected to vest at ending balance, exercise price (USD per share) $ 244.82    
Time-Vested Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Stock units, beginning balance (shares) 2,068    
Granted, sock units (shares) 736    
Distributed, stock units (shares) (676)    
Forfeited, canceled or expired, stock units (shares) (431)    
Stock units, ending balance (shares) 1,697 2,068  
Stock units, vested and expected to vest at ending balance (shares) 1,622    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Stock units exercise price, beginning balance (USD per share) $ 210.48    
Granted, stock units weighted average grant date fair value (USD per share) 249.94 $ 235.50 $ 216.06
Distributed, stock units exercise price (USD per share) 211.19    
Forfeited, canceled or expired, stock units exercise price (USD per share) 215.56    
Stock units exercise price, ending balance (USD per share) 226.01 $ 210.48  
Stock units, vested and expected to vest at ending balance, exercise price (USD per share) $ 225.22