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Equity Incentive Plans - Schedule of Restricted Stock Unit Activity (Details) - Restricted Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Shares
Balance of outstanding restricted stock units, beginning, Shares | shares	3,509
Granted, shares | shares	1,480
Vested, Shares | shares	(1,488)
Forfeited or not earned, Shares | shares	(284)
Balance of outstanding restricted stock units, ending, Shares | shares	3,217
Weighted- Average Grant Date Fair Value
Balance of outstanding restricted stock units, beginning (in USD per share) | $ / shares	$ 79.13
Granted (in USD per share) | $ / shares	111.48
Vested (in USD per share) | $ / shares	80.64
Forfeited or not earned (in USD per share) | $ / shares	90.99
Balance of outstanding restricted stock units, ending (in USD per share) | $ / shares	$ 92.46
Intrinsic value [Abstract]
Aggregate Intrinsic Value, Ending Balance of outstanding restricted stock | $	$ 385,311

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 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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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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