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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement, Noncash Expense [Abstract]  
Schedule Of Assumptions In Determining The Fair Value Of Shares Issued Under The Employee Stock Purchase Plan
In determining the fair value of the right to purchase under the Employee Stock Purchase Plan, the Company uses the Black-Scholes option pricing model that employs the following key assumptions:
 Employee Stock Purchase Plan
Years Ended September 30,
 202520242023
Volatility
28.85% - 29.40%
18.19% - 20.32%
33.02% - 38.15%
Expected term (in years)
0.50.50.5
Dividend yield
— — — 
Risk-free interest rate
4.28% - 4.98%
5.28% - 5.52%
3.18% - 4.90%
Schedule Of Summary Of Restricted Stock Unit Activity
A summary of restricted stock unit activity under the Plan is as follows:
Performance Stock UnitsRestricted Stock Units
Outstanding
Performance
Stock Units		Weighted
Average
Grant Date
Fair Value		Outstanding
Restricted
Stock Units		Weighted
Average
Grant Date
Fair Value
Balance, September 30, 2024213,776 $155.63 1,312,328 $158.22 
Units granted120,235 248.47 1,167,667 255.09 
Units vested(117,333)174.32 (1,058,085)174.19 
Units cancelled(32,955)170.83 (224,382)181.40 
Balance, September 30, 2025183,723 $220.40 1,197,528 $234.22 
Schedule of Share-Based Payment Award, Performance-based Awards, Valuation Assumptions In determining the fair value of the portion of the performance awards based on Total Shareholder Return, the Company uses a Monte Carlo simulation model that employs the following key assumptions:
 
Performance Awards based on Total Shareholder Return
Years Ended September 30,
 202520242023
Volatility
24.06% - 30.78%
22.60% - 32.35%
31.74% - 40.59%
Expected term (in years)
0.91 - 2.91
0.91 - 2.91
0.91 - 2.91
Dividend yield
— — — 
Risk-free interest rate
4.14% - 4.26%
4.72% - 5.32%
4.44% - 4.66%
Grant-date fair value per share
$339.61 - $346.95
$192.58 - $210.37
$157.36 - $194.41
Schedule of Nonvested Restricted Stock Units Activity
As of September 30, 2025, the following annual equity grants for executive officers or a portion thereof are outstanding:
Grant DateRSUs GrantedVesting ScheduleVesting PeriodDate Fully Vested
November 1, 2024165,912
Quarterly, Annually
3 yearsNovember 1, 2027
November 1, 2023206,560
Quarterly, Annually
3 yearsNovember 1, 2026
November 1, 2022240,808
Quarterly, Annually
3 yearsNovember 1, 2025
Schedule Of Stock Option Activity
A summary of stock option activity under all of the Company’s plans is as follows:
 Options Outstanding
 Number of
Shares		Weighted
Average
Exercise Price
per Share
Balance, September 30, 202454,090 $39.36 
Options granted— — 
Options exercised(25,818)37.28 
Options cancelled(792)26.52 
Balance, September 30, 202527,480 $41.69 
Schedule Of Outstanding Stock Options Currently Exercisable, Vested And Expected To Vest
A summary of options outstanding that are exercisable and that have vested and are expected to vest as of September 30, 2025 is as follows:
Number of
Shares		Weighted
Average
Remaining
Contractual
Life (in Years)		Weighted
Average
Exercise
Price
per Share		Aggregate
Intrinsic
Value(1)
 (In thousands)
Stock options outstanding27,480 3.50$41.69 $7,736 
Exercisable27,480 3.50$41.69 $7,736 
Vested and expected to vest27,480 3.50$41.69 $7,736 
(1)Aggregate intrinsic value represents the difference between the fair value of the Company’s common stock underlying these options at September 30, 2025 and the related exercise prices.
Schedule Of Equity Based Awards (Including Stock Options And Restricted Stock Units)
As of September 30, 2025, equity based awards (including stock options and restricted stock units) are available for future issuance as follows:
 Awards
Available for
Grant
Balance, September 30, 20243,952,900 
Granted(1,287,902)
Cancelled262,653 
Additional shares reserved (terminated), net(5,316)
Balance, September 30, 20252,922,335