Equity Incentive Plans - Additional Information (Details) $ / shares in Units, $ in Thousands, shares in Millions	12 Months Ended
Sep. 30, 2021 USD ($) shares / unit $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock Issuable per Restricted Stock Unit \| shares / unit	1
Stock-based compensation	$ 177,289	$ 115,149	$ 86,400
Total unrecognized compensation cost	$ 190,300
Weighted average remaining recognition period, in months	17 months
Common stock were available for grant under the 2000 plan \| shares	4.1
Common stock were reserved for issuance \| shares	3.2
ESPP maximum contribution percentage	10.00%
ESPP maximum contribution amount by employee	$ 25,000
ESPP purchase price as a % of stock price	85.00%
Vesting period	1 year
Shares withheld for tax withholding obligation \| shares	0.5	0.5	0.5
Payments of withholding taxes in connection with vesting of stock-based awards	$ 52,957	$ 33,740	$ 44,366
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 7,300	$ 5,800	$ 6,200
Restricted Shares and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per share \| $ / shares	$ 111.48	$ 77.57	$ 82.77
TSR Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per share \| $ / shares	$ 124.04
Vesting period	3 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per share \| $ / shares	$ 111.48
Payments of withholding taxes in connection with vesting of stock-based awards	$ 53,100	$ 33,700	$ 44,400

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ESPP purchase price as a % of stock price

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Common Stock Issuable per Restricted Stock Unit

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

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of noncash expense for 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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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