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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Company's Share Awards
The following table summarizes the activity for the Company’s unvested share awards under the Plan:
Deferred Equity UnitsMatching Equity UnitsDeferred Equity Units Weighted-Average Intrinsic ValueMatching Equity Units Weighted-Average Intrinsic ValueDeferred Equity Units Weighted-Average Grant-Date Intrinsic ValueMatching Equity Units Weighted-Average Grant-Date Intrinsic Value
Unvested units at September 30, 20191,900,747 6,681,397 $7.71 $4.60 $3.13 $— 
Granted— — — — — — 
Vested(1,351,293)(2,369,536)27.01 24.04 23.91 — 
Forfeited— — — — — — 
Unvested units at September 30, 2020549,454 4,311,861 $27.01 $23.82 $23.82 $— 
Granted— — — — — — 
Vested(549,454)(2,303,578)44.21 41.02 41.02 — 
Forfeited— — — — — — 
Unvested units at September 30, 2021— 2,008,283 $— $41.02 $— $— 
Schedule of Unvested Restricted Stock Units Roll Forward
The following table summarizes the activity for the Company’s unvested RSUs:
Number of
Share Units		Weighted-Average Grant
Date Fair Value		Aggregate
Intrinsic Value
(in thousands)
Unvested and outstanding balance as of September 30, 2020— $— $— 
Granted1,604,922 32.23 
Vested(217)36.87 
Forfeited/canceled(69,338)30.83 
Unvested and outstanding balance as of September 30, 20211,535,367 $32.29 $67,879