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Share-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Award, Stock options, Valuation Assumptions
Fair value is estimated at the grant date based on a Black-Scholes-Merton option-pricing model using the following weighted-average assumptions:
Fiscal Year Ended September 30, 2020
 
2020 (1)
20192018
Expected stock price volatility— %27 %30 %
Expected dividend yield— %— %— %
Risk free interest rate— %1.86 %1.23 %
Average expected life (in years)0.006.053.06
(1) There were no stock options granted under the plan during the year ended September 30, 2020.
Share-based Compensation, Stock Options, Activity
The following is a summary of stock option activity for the year ended September 30, 2020:
Shares
Available for
Grant		Number of
Options
Outstanding		Weighted
Average 
Exercise Price		Weighted
Average
Grant Date
Fair Value		Weighted
Average
Remaining
Term
(in years)		Aggregate
Intrinsic
Value
($ millions)
Balances at September 30, 2019692,652 1,684,378 $37.59 $11.32 4.62$9.2 
Exercised(244,511)$30.56 $11.36 
Forfeited13,662 (13,662)$39.64 $8.62 
Expired18,169 (18,169)$37.30 $8.19 
Balances at September 30, 2020724,483 1,408,036 $38.79 $11.38 4.16$17.4 
Exercisable at September 30, 2020423,112 $29.25 $12.64 1.38$9.3 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
The options outstanding as of September 30, 2020 broken down by exercise price are as follows:
Exercise PriceNumber of Options OutstandingWeighted Average Exercise PriceWeighted Average Remaining Term
(in Years)
$— -$5.00 — n/an/a
$5.00 -$10.00 — n/an/a
$10.00 -$15.00 — n/an/a
$15.00 -$20.00 — n/an/a
$20.00 -$25.00 — n/an/a
$25.00 -$30.00 420,000 $25.91 1.36
$30.00 -$35.00 — n/an/a
$35.00 -$40.00 126,161 $39.65 2.02
$40.00 -$45.00 859,875 $44.92 5.84
$45.00 -$50.00 — n/an/a
$50.00 -$55.00 — n/an/a
$55.00 -$60.00 2,000 $55.28 1.89
1,408,036 $38.79 4.16
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following is a summary of restricted stock activity through September 30, 2020:
Shares
Available for
Grant		Number of
Shares
Outstanding		Weighted
Average
Grant Date
Fair Value		Weighted
Average
Remaining
Term
(in years)		Aggregate
Intrinsic Value
($ millions)
Balances at September 30, 20191,156,902 350,778 $40.06 1.36$14.4 
Granted(299,858)299,858 $44.94 
Vested— (161,880)$40.26 
Forfeited4,410 (4,410)$44.23 
Balances at September 30, 2020861,454 484,346 $42.97 1.37$24.8