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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, 2019
Sep. 30, 2018
Sep. 30, 2017
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) 1,032    
Granted, sock units (shares) 381    
Distributed, stock units (shares) (142)    
Forfeited, canceled or expired, stock units (shares) (316)    
Stock units, ending balance (shares) 955 1,032  
Stock units, vested and expected to vest at ending balance (shares) 306    
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) $ 190.57    
Granted, stock units weighted average grant date fair value (USD per share) 237.55 $ 251.75 $ 174.92
Distributed, stock units exercise price (USD per share) 153.73    
Forfeited, canceled or expired, stock units exercise price (USD per share) 182.50    
Stock units exercise price, ending balance (USD per share) 221.73 $ 190.57  
Stock units, vested and expected to vest at ending balance, exercise price (USD per share) $ 218.06    
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) 2,765    
Granted, sock units (shares) 755    
Distributed, stock units (shares) (906)    
Forfeited, canceled or expired, stock units (shares) (546)    
Stock units, ending balance (shares) 2,068 2,765  
Stock units, vested and expected to vest at ending balance (shares) 1,964    
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) $ 194.92    
Granted, stock units weighted average grant date fair value (USD per share) 235.50 $ 216.06 $ 165.96
Distributed, stock units exercise price (USD per share) 189.06    
Forfeited, canceled or expired, stock units exercise price (USD per share) 201.85    
Stock units exercise price, ending balance (USD per share) 210.48 $ 194.92  
Stock units, vested and expected to vest at ending balance, exercise price (USD per share) $ 209.67