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Stock-Based Compensation - Narrative (Details) - USD ($)
12 Months Ended
Oct. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Expense   $ 219,100,000 $ 236,700,000 $ 249,200,000
Share-based Payment Arrangement, Expense, Tax Benefit   44,400,000 $ 44,700,000 $ 47,300,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 171,200,000    
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   $ 155.99 $ 144.78 $ 206.13
Fair market value of restricted stock vested   $ 228,100,000 $ 195,900,000 $ 262,400,000
Total intrinsic value of options exercised   $ 7,500,000 $ 6,900,000 $ 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 748,580      
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   2,007,597    
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    
Number of Shares Authorized   3,952,900    
Vesting rate of stock options and awards upon certain changes in ownership control   50.00%    
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   122,841    
Outstanding stock units   213,776 199,918  
Shares Issued in Period   122,841    
Weighted Average Grant Date Fair Value   $ 155.63 $ 159.37  
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   1,459,527    
Outstanding stock units   1,312,328 1,225,386  
Shares Issued in Period   1,459,527    
Weighted Average Grant Date Fair Value   $ 158.22 $ 156.89  
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    
Volterra Acquisition Equity Incentive Plan | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding stock units   4,679    
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   2,351    
Lilac Acquisition Equity Incentive Plan | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding stock units   20,601    
Lilac Cloud 2018 Equity Incentive Plan | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding stock units   1,059    
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   947    
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   3,374    
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   31,363    
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   18,406