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- Definition

Stock Options And Awards Vesting Rate Entity Control Change

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Discount rate from fair value on offering date that participants pay for shares.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Number of shares issued under share-based payment arrangement.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation - Narrative (Details) - USD ($)		12 Months Ended
	Oct. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Feb. 01, 2023	Oct. 01, 2021	Jan. 22, 2021	Jan. 24, 2020	May 08, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		$ 236,700,000	$ 249,200,000	$ 243,300,000
Share-based Payment Arrangement, Expense, Tax Benefit		44,700,000	$ 47,300,000	$ 44,100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 162,700,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		2 years
Expected term		6 months	6 months	6 months
Weighted Average Grant Date Fair Value		$ 144.78	$ 206.13	$ 145.89
Fair market value of restricted stock vested		$ 195,900,000	$ 262,400,000	$ 261,900,000
Total intrinsic value of options exercised		$ 6,900,000	$ 25,600,000	$ 25,600,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Grants in Period	1,256,510
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		2 years	2 years	2 years
Two Thousand Eleven Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance		12,000,000
Percentage of base compensation for which employees can acquire shares of common stock		15.00%
Maximum shares allowed for purchase by employee in period		10,000
Maximum aggregate fair value of stock that an employee may purchase		$ 25,000
Expected term		6 months
Percentage of common stock lesser of the fair market value		85.00%
Number of Shares Authorized		2,444,575
Nginx Acquisition Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance									183,061
Vesting rate of stock options and awards upon certain changes in ownership control		50.00%
Nginx Acquisition Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock units		19
Nginx, Inc. 2011 Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance									302,634
Nginx, Inc. 2011 Share Plan [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for purchase under stock option plan		6,010
Shape Acquisition Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance								450,000
Vesting rate of stock options and awards upon certain changes in ownership control		50.00%
Shape Acquisition Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock units		20,754
Shape 2011 Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance								501,085
Shape 2011 Share Plan [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for purchase under stock option plan		51,144
Volterra Acquisition Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance							140,000
Vesting rate of stock options and awards upon certain changes in ownership control		50.00%
Volterra Acquisition Equity Incentive Plan \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock units		39,472
Volterra 2017 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance							261,696
Volterra 2017 Stock Plan \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock units		7,171
Volterra 2017 Stock Plan \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for purchase under stock option plan		46,778
Threat Stack Acquisition Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance						35,000
Vesting rate of stock options and awards upon certain changes in ownership control		50.00%
Threat Stack Acquisition Equity Incentive Plan \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock units		6,915
Lilac Acquisition Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance					55,000
Vesting rate of stock options and awards upon certain changes in ownership control		50.00%
Lilac Acquisition Equity Incentive Plan \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock units		47,904
Shares Issued in Period		47,904
Lilac Cloud 2018 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance					4,485
Lilac Cloud 2018 Equity Incentive Plan \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for purchase under stock option plan		1,936
Shares Issued in Period		2,051
Two Thousand Fourteen Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance		27,880,000
Vesting rate of stock options and awards upon certain changes in ownership control		50.00%
Number of Shares Authorized		5,287,273
Two Thousand Fourteen Equity Incentive Plan [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Grants in Period		131,491
Outstanding stock units		199,918	208,116
Shares Issued in Period		131,491
Weighted Average Grant Date Fair Value		$ 159.37	$ 169.99
Two Thousand Fourteen Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Grants in Period		1,448,427
Outstanding stock units		1,225,386	1,137,619
Shares Issued in Period		1,448,427
Weighted Average Grant Date Fair Value		$ 156.89	$ 184.59