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Stock-Based Compensation - Summary of Activity Relating to Restricted Units (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning Balance   0 0  
Granted     250,000  
Earned/released     (250,000)  
Ending Balance     0  
Vested     $ 15.55  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 0 $ 0
Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning Balance 0      
Ending Balance 0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 0 $ 0    
Number of Shares Underlying Restricted Units - Contingent Awards        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning Balance 3,039,568 5,043,931 4,224,488  
Granted 1,342,836 2,175,537 3,224,696  
Earned/released (1,405,485) (2,092,862) (1,790,514)  
Forfeited (688,835) (2,087,038) (614,739)  
Ending Balance 1,991,325 3,039,568 5,043,931  
Weighted average remaining contractual term of outstanding Restricted Units 1 year 4 months 24 days      
Unearned stock based compensation expense $ 24.5      
Aggregate intrinsic value of outstanding Restricted Units $ 32.5      
Number of Shares Underlying Restricted Units - Time-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning Balance 6,872,087 6,477,164 5,884,023  
Granted 9,500,077 8,876,712 8,457,761  
Earned/released (6,383,908) (7,156,468) (7,150,783)  
Forfeited (1,286,071) (1,325,321) (713,837)  
Ending Balance 8,998,944 6,872,087 6,477,164  
Weighted average remaining contractual term of outstanding Restricted Units 1 year 10 months 24 days      
Unearned stock based compensation expense $ 84.0      
Aggregate intrinsic value of outstanding Restricted Units $ 146.9