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Employee Benefit Plans (Tables)
 12 Months Ended
Sep. 30, 2021
Compensation Related Costs [Abstract]  
Additional information related to time-based RSU activity
The following table provides additional information related to time-based RSU activity during fiscal 2021, 2020 and 2019. The number of restricted stock units vested includes shares of common stock withheld by the Company on behalf of employees to satisfy the tax withholding requirements.
Year Ended September 30,
202120202019
Number of
Restricted Stock Units		Weighted Average
Grant Date Fair Value		Number of
Restricted Stock Units		Weighted Average
Grant Date Fair Value		Number of
Restricted Stock Units		Weighted Average
Grant Date Fair Value
Outstanding at beginning of year4,725,701 $34.79 4,889,534 $33.01 4,797,922 $31.77 
Granted856,615 83.13 1,657,935 35.98 1,796,200 33.75 
Vested(1,644,263)33.26 (1,651,840)30.85 (1,430,826)29.83 
Cancelled(120,788)39.16 (169,928)33.24 (273,762)32.82 
Outstanding at end of year3,817,265 $46.16 4,725,701 $34.79 4,889,534 $33.01 
Additional information related to performance-based RSUs outstanding
The following table provides additional information related to the performance-based RSUs outstanding at September 30, 2021.
Grant DateVesting DateTarget Number of Performance Units Grant Date Fair Value per UnitCompensation Expense
Year Ended September 30,
202120202019
(In millions)
November 2018September 2021360,000$37.75 $7.2 $6.7 $6.1 
November 2019September 2022360,00052.54 10.1 9.3 — 
November 2020September 2023360,00070.60 12.5 — — 
$29.8 $16.0 $6.1 
Share-based Payment Arrangement, Option, Activity [Table Text Block] The following table provides information related to stock option activity during those years.
 Year Ended September 30,
 202120202019
Stock OptionsWeighted Average
Exercise Price		Stock OptionsWeighted Average
Exercise Price		Stock OptionsWeighted Average
Exercise Price
Outstanding at beginning of year2,224,415 $19.94 3,184,157 $19.53 5,856,959 $17.25 
Exercised(1,108,639)16.02 (959,742)18.58 (2,634,802)14.47 
Cancelled or expired— — — — (38,000)18.98 
Outstanding at end of year1,115,776 $23.84 2,224,415 $19.94 3,184,157 $19.53 
Exercisable at end of year1,115,776 $23.84 2,224,415 $19.94 3,184,157 $19.53