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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, 2021
Sep. 30, 2020
Sep. 30, 2019
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) 63    
Units In Excess Of Expected Performance Payout 555    
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) 962    
Granted, sock units (shares) 406    
Distributed, stock units (shares) (39)    
Forfeited, canceled or expired, stock units (shares) (373)    
Stock units, ending balance (shares) 957 962  
Stock units, vested and expected to vest at ending balance (shares) 339    
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) $ 244.42    
Granted, stock units weighted average grant date fair value (USD per share) 216.39 $ 245.06 $ 237.55
Distributed, stock units exercise price (USD per share) 252.57    
Forfeited, canceled or expired, stock units exercise price (USD per share) 245.86    
Stock units exercise price, ending balance (USD per share) 231.63 $ 244.42  
Stock units, vested and expected to vest at ending balance, exercise price (USD per share) $ 227.92    
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) 1,697    
Granted, sock units (shares) 881    
Distributed, stock units (shares) (601)    
Forfeited, canceled or expired, stock units (shares) (421)    
Stock units, ending balance (shares) 1,556 1,697  
Stock units, vested and expected to vest at ending balance (shares) 1,478    
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) $ 226.01    
Granted, stock units weighted average grant date fair value (USD per share) 223.60 $ 249.94 $ 235.50
Distributed, stock units exercise price (USD per share) 231.44    
Forfeited, canceled or expired, stock units exercise price (USD per share) 231.29    
Stock units exercise price, ending balance (USD per share) 221.11 $ 226.01  
Stock units, vested and expected to vest at ending balance, exercise price (USD per share) $ 220.60