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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2020
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,
 202020192018
Risk-free interest rate
1.10% - 1.97%
2.25% - 2.51%
1.14% - 1.77%
Expected dividend— — — 
Expected term0.5 years0.5 years0.5 years
Expected volatility
26.32% - 41.94%
18.14% - 31.74%
22.03% - 24.87%
Schedule Of Summary Of Restricted Stock Unit Activity
A summary of restricted stock unit activity under the 2014 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, 201955,184 $165.83 1,041,889 $158.10 
Units granted152,199 147.30 1,237,609 142.58 
Units vested(42,053)142.01 (933,413)134.49 
Units cancelled(19,461)157.81 (141,795)150.58 
Balance, September 30, 2020145,869 $146.42 1,204,290 $146.39 
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 ValueExpected TermRisk-FreeIndexExpected
Grant Dateper Share(in years)Interest RateF5 NetworksMembersDividend
November 1, 2019
Tranche 1$196.02 0.911.53 %27.61 %26.88 %— 
Tranche 2$199.85 1.911.55 %26.22 %26.70 %— 
Tranche 3$202.56 2.911.54 %24.90 %24.82 %— 
Schedule of Nonvested Restricted Stock Units Activity
As of September 30, 2020, the following annual equity grants for executive officers or a portion thereof are outstanding:
Grant DateRSUs GrantedVesting ScheduleVesting PeriodDate Fully Vested
November 1, 2019228,616
Quarterly, Annually1
3 yearsNovember 1, 2022
November 1, 2018144,066
Quarterly, Annually1
3 yearsNovember 1, 2021
November 1, 2017140,135
Quarterly, Annually1
4 yearsNovember 1, 2021
November 1, 2016115,347Quarterly4 yearsNovember 1, 2020
(1)50% of the annual equity grant vests in equal quarterly increments and 50% 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, 2019207,759 $24.43 
Options granted334,709 41.10 
Options exercised(104,487)24.84 
Options cancelled(46,881)40.09 
Balance, September 30, 2020391,100 $36.71 
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, 2020 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 outstanding391,100 7.81$36.71 $34,236 
Exercisable119,734 7.11$25.38 $11,683 
Vested and expected to vest368,503 7.77$36.04 $32,477 
(1)Aggregate intrinsic value represents the difference between the fair value of the Company’s common stock underlying these options at September 30, 2020 and the related exercise prices.
Schedule Of Equity Based Awards (Including Stock Options And Restricted Stock Units)
As of September 30, 2020, equity based awards (including stock options and restricted stock units) are available for future issuance as follows:
 Awards
Available for
Grant
Balance, September 30, 20192,939,974 
Granted(2,143,605)
Cancelled266,925 
Additional shares reserved (terminated), net1,651,664 
Balance, September 30, 20202,714,958