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Stock-Based Compensation - Summarize Information about Stock Options (Detail)	3 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options Outstanding, beginning balance | shares	3,456,239
Number of Options Outstanding, Cancelled | shares	(30,420)
Number of Options Outstanding, Exercised | shares	(207,814)
Number of Options Outstanding, ending balance | shares	3,218,005
Number of Options Outstanding, Exercisable | shares	2,460,188
Weighted-Average Exercise Price Per Share, beginning balance | $ / shares	$ 19.60
Weighted-Average Exercise Price Per Share, Cancelled | $ / shares	35.57
Weighted-Average Exercise Price Per Share, Exercised | $ / shares	10.32
Weighted-Average Exercise Price Per Share, ending balance | $ / shares	20.05
Weighted-Average Exercise Price Per Share, Exercisable | $ / shares	$ 13.69
Weighted-Average Remaining Contractual Term	5 years 4 months 24 days
Weighted-Average Remaining Contractual Term, Exercisable	4 years 7 months 6 days
Aggregate Intrinsic Value | $	$ 149,311,699
Aggregate Intrinsic Value, Exercisable | $	$ 129,520,403

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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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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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