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Employee Benefit Plans (Tables)
 12 Months Ended
Sep. 30, 2023
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 2023, 2022 and 2021. The number of RSUs vested includes shares of common stock withheld by the Company on behalf of employees to satisfy the tax withholding requirements.
Year Ended September 30,
202320222021
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 year3,466,094 $57.50 3,817,265 $46.16 4,725,701 $34.79 
Granted877,131 93.44 1,153,124 74.96 856,615 83.13 
Vested(1,251,785)50.61 (1,402,642)41.44 (1,644,263)33.26 
Cancelled(124,515)61.95 (101,653)51.22 (120,788)39.16 
Outstanding at end of year2,966,925 $70.85 3,466,094 $57.50 3,817,265 $46.16 
Additional information related to performance-based RSUs outstanding
The following table provides additional information related to the performance-based RSUs outstanding at September 30, 2023.

Grant DateVesting DateTarget Number of Performance Units Grant Date Fair Value per UnitCompensation Expense
Year Ended September 30,
202320222021
(In millions)
November 2020September 2023360,000$70.60 $11.0 $12.5 $12.5 
October 2021 (1)September 2024430,00080.58 14.3 14.3 — 
October 2022September 2025600,00079.97 11.6 — — 
$36.9 $26.8 $12.5 
_________________________
(1)The performance RSUs granted in October 2021 totaled 390,000; however, in March 2022, the Compensation Committee of the Company’s Board of Directors approved an amendment and restatement of this award to increase the RSUs granted from 390,000 to 430,000. Concurrent with this change, the Compensation Committee amended the executive officer short-term performance bonus plan to reduce the amount of the award that could be earned.
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,
 202320222021
Stock OptionsWeighted Average
Exercise Price		Stock OptionsWeighted Average
Exercise Price		Stock OptionsWeighted Average
Exercise Price
Outstanding at beginning of year823,486 $23.84 1,115,776 $23.84 2,224,415 $19.94 
Exercised(603,823)23.83 (292,290)23.83 (1,108,639)16.02 
Cancelled or expired— — — — — — 
Outstanding at end of year219,663 $23.86 823,486 $23.84 1,115,776 $23.84 
Exercisable at end of year219,663 $23.86 823,486 $23.84 1,115,776 $23.84