STOCK-BASED COMPENSATION - Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity (Detail)	12 Months Ended
Sep. 30, 2024 USD ($) $ / shares shares
2019 Stock Option Plan
Number of Options
Number of Options, Granted	3,435,370
2019 Stock Option Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	223,945
Number of Options, Granted	398,729
Number of Options, Exercised	(3,521)
Number of Options, Forfeited	(58,044)
Number of Options, Expired	0
Number of Options, Outstanding, end of period	561,109
Number of Options, Expected to vest	309,408
Number of Options Exercisable at end of period	120,116
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period \| $ / shares	$ 627.81
Weighted-Average Exercise Price Per Option, Granted \| $ / shares	889.08
Weighted-Average Exercise Price Per Option, Exercised \| $ / shares	631.12
Weighted-Average Exercise Price Per Option, Forfeited \| $ / shares	792.32
Weighted-Average Exercise Price Per Option, Expired \| $ / shares	0
Weighted-Average Exercise Price Per Option, Outstanding, end of period \| $ / shares	795.95
Weighted-Average Exercise Price Per Option, Expected to vest \| $ / shares	833.09
Weighted-Average Exercise Price Per Option, Exercisable \| $ / shares	$ 712.29
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	8 years 9 months 18 days
Weighted-Average Remaining Contractual Term, Expected to vest, years	8 years 10 months 24 days
Weighted-Average Remaining Contractual Term, Exercisable, years	8 years 6 months
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding \| $	$ 354,160,779
Aggregate Intrinsic Value, Expected to vest \| $	183,800,728
Aggregate Intrinsic Value, Exercisable \| $	$ 85,863,473
2014 Stock Option Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	4,246,321
Number of Options, Granted	158,550
Number of Options, Exercised	(529,387)
Number of Options, Forfeited	(95,981)
Number of Options, Expired	0
Number of Options, Outstanding, end of period	3,779,503
Number of Options, Expected to vest	785,057
Number of Options Exercisable at end of period	2,892,840
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period \| $ / shares	$ 443.02
Weighted-Average Exercise Price Per Option, Granted \| $ / shares	971.00
Weighted-Average Exercise Price Per Option, Exercised \| $ / shares	316.35
Weighted-Average Exercise Price Per Option, Forfeited \| $ / shares	611.34
Weighted-Average Exercise Price Per Option, Expired \| $ / shares	0
Weighted-Average Exercise Price Per Option, Outstanding, end of period \| $ / shares	466.18
Weighted-Average Exercise Price Per Option, Expected to vest \| $ / shares	653.01
Weighted-Average Exercise Price Per Option, Exercisable \| $ / shares	$ 390.75
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	5 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Expected to vest, years	7 years 7 months 6 days
Weighted-Average Remaining Contractual Term, Exercisable, years	4 years 6 months
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding \| $	$ 3,631,913,408
Aggregate Intrinsic Value, Expected to vest \| $	607,728,325
Aggregate Intrinsic Value, Exercisable \| $	$ 2,998,078,391
2006 Stock Incentive Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	450,192
Number of Options, Granted	0
Number of Options, Exercised	(375,977)
Number of Options, Forfeited	0
Number of Options, Expired	0
Number of Options, Outstanding, end of period	74,215
Number of Options Exercisable at end of period	74,215
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period \| $ / shares	$ 211.49
Weighted-Average Exercise Price Per Option, Granted \| $ / shares	0
Weighted-Average Exercise Price Per Option, Exercised \| $ / shares	199.71
Weighted-Average Exercise Price Per Option, Forfeited \| $ / shares	0
Weighted-Average Exercise Price Per Option, Expired \| $ / shares	0
Weighted-Average Exercise Price Per Option, Outstanding, end of period \| $ / shares	226.34
Weighted-Average Exercise Price Per Option, Exercisable \| $ / shares	$ 226.34
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	1 year 1 month 6 days
Weighted-Average Remaining Contractual Term, Exercisable, years	1 year 1 month 6 days
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding \| $	$ 89,116,630
Aggregate Intrinsic Value, Exercisable \| $	$ 89,116,630

Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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