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Stock-Based Compensation - Summarize Information about Stock Options (Detail) - USD ($)	9 Months Ended
	Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options Outstanding, beginning balance	4,539,403
Number of Options Outstanding, Granted	186,000
Number of Options Outstanding, Cancelled	(167,609)
Number of Options Outstanding, Exercised	(981,219)
Number of Options Outstanding, ending balance	3,576,575
Number of Options Outstanding, Exercisable	2,417,915
Weighted-Average Exercise Price Per Share, beginning balance	$ 16.67
Weighted-Average Exercise Price Per Share, Granted	65.57
Weighted-Average Exercise Price Per Share, Cancelled	34.86
Weighted-Average Exercise Price Per Share, Exercised	10.69
Weighted-Average Exercise Price Per Share, ending balance	20.00
Weighted-Average Exercise Price Per Share, Exercisable	$ 11.18
Weighted-Average Remaining Contractual Term	5 years 10 months 24 days
Weighted-Average Remaining Contractual Term, Exercisable	4 years 8 months 12 days
Aggregate Intrinsic Value	$ 224,666,017
Aggregate Intrinsic Value, Exercisable	$ 173,212,122

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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