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Stock-Based Compensation (Tables)

12 Months Ended

Sep. 30, 2023

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,
						2023						2022						2021
Risk-free interest rate						3.18% - 4.90%						0.05% - 0.62%						0.07% - 0.13%
Expected dividend						—						—						—
Expected term						0.5 years						0.5 years						0.5 years
Expected volatility						33.02% - 38.15%						26.34% - 31.57%						29.67% - 37.22%

Schedule Of Summary Of Restricted Stock Unit Activity

A summary of restricted stock unit activity under the Plan is as follows:

						Performance Stock Units												Restricted 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, 2022						208,116						$	169.99					1,137,619						$	184.59
Units granted						131,491						145.02						1,448,427						145.10
Units vested						(92,677)						144.69						(1,113,259)						147.10
Units cancelled						(47,012)						171.07						(247,401)						162.80
Balance, September 30, 2023						199,918						$	159.37					1,225,386						$	156.89

Schedule of Share-based Payment Award, Stock Options, 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:

																								Expected Volatility
						Fair Value						Expected Term						Risk-Free												Index						Expected
Grant Date						per Share						(in years)						Interest Rate						F5						Members						Dividend
November 1, 2022
Tranche 1						$	157.36					0.91						4.66		%				37.17		%				35.56		%				—
Tranche 2						$	173.68					1.91						4.51		%				31.84		%				31.74		%				—
Tranche 3						$	194.41					2.91						4.44		%				35.50		%				40.59		%				—

Schedule of Nonvested Restricted Stock Units Activity

As of September 30, 2023, the following annual equity grants for executive officers or a portion thereof are outstanding:

Grant Date

RSUs Granted

Vesting Schedule

Vesting Period

Date Fully Vested

November 1, 2022

240,808

Quarterly, Annually1,2

3 years

November 1, 2025

November 1, 2021

160,384

Quarterly, Annually1,2

3 years

November 1, 2024

November 2, 2020

257,568

Quarterly, Annually1

3 years

November 1, 2023

November 1, 2019

228,616

Quarterly, Annually1

3 years

November 1, 2022

(1)50% of the annual equity grant vests in equal quarterly increments and 50% is subject to the Company achieving specified annual performance goals.

(2)For the Company's Chief Executive Officer, 40% of the annual equity grant vests in equal quarterly increments and 60% is subject to the Company achieving specified annual performance goals.

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, 2022						164,796						$	33.34
Options granted						2,051						4.55
Options exercised						(56,516)						26.38
Options cancelled						(4,463)						61.35
Balance, September 30, 2023						105,868						$	35.31

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, 2023 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 outstanding						105,868						5.62						$	35.31					$	13,321
Exercisable						99,067						5.54						$	35.47					$	12,449
Vested and expected to vest						105,561						5.61						$	35.36					$	13,277

(1)Aggregate intrinsic value represents the difference between the fair value of the Company’s common stock underlying these options at September 30, 2023 and the related exercise prices.

Schedule Of Equity Based Awards (Including Stock Options And Restricted Stock Units)

As of September 30, 2023, equity based awards (including stock options and restricted stock units) are available for future issuance as follows:

						Awards Available for Grant
Balance, September 30, 2022						2,072,778
Granted						(1,629,873)
Cancelled						349,715
Additional shares reserved (terminated), net						4,504,183
Balance, September 30, 2023						5,296,803

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