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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Company's Share Awards
The following is a summary of the Company’s share awards:
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, 20182,863,456 12,885,551 $6.37 $3.50 $3.12 $— 
Granted— — — — — — 
Vested(962,709)(6,204,154)7.71 5.10 3.09 — 
Forfeited— — — — — — 
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 $—