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STOCK-BASED COMPENSATION - Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity (Detail)
 12 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
2019 Stock Option Plan  
Number of Options  
Number of Options, Granted 3,210,451
2019 Stock Option Plan | Performance Vested Stock Options  
Number of Options  
Number of Options, Outstanding, beginning of period 561,109
Number of Options, Granted 346,664
Number of Options, Exercised (26,420)
Number of Options, Forfeited (121,745)
Number of Options, Expired 0
Number of Options, Outstanding, end of period 759,608
Number of Options, Expected to vest 409,971
Number of Options Exercisable at end of period 93,696
Weighted average exercise price per option  
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period | $ / shares $ 795.95
Weighted-Average Exercise Price Per Option, Granted | $ / shares 1,316.43
Weighted-Average Exercise Price Per Option, Exercised | $ / shares 656.47
Weighted-Average Exercise Price Per Option, Forfeited | $ / shares 909.08
Weighted-Average Exercise Price Per Option, Expired | $ / shares 0
Weighted-Average Exercise Price Per Option, Outstanding, end of period | $ / shares 1,020.2
Weighted-Average Exercise Price Per Option, Expected to vest | $ / shares 1,051.67
Weighted-Average Exercise Price Per Option, Exercisable | $ / shares $ 724.47
Weighted average remaining contractual term  
Weighted-Average Remaining Contractual Term, Outstanding, years 8 years 4 months 24 days
Weighted-Average Remaining Contractual Term, Expected to vest, years 8 years 6 months
Weighted-Average Remaining Contractual Term, Exercisable, years 7 years 7 months 6 days
Aggregate intrinsic value  
Aggregate Intrinsic Value, Outstanding | $ $ 226,226,455
Aggregate Intrinsic Value, Expected to vest | $ 109,195,776
Aggregate Intrinsic Value, Exercisable | $ $ 55,613,261
2014 Stock Option Plan | Performance Vested Stock Options  
Number of Options  
Number of Options, Outstanding, beginning of period 3,779,503
Number of Options, Granted 0
Number of Options, Exercised (462,368)
Number of Options, Forfeited (86,209)
Number of Options, Expired 0
Number of Options, Outstanding, end of period 3,230,926
Number of Options, Expected to vest 478,730
Number of Options Exercisable at end of period 2,429,832
Weighted average exercise price per option  
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period | $ / shares $ 466.18
Weighted-Average Exercise Price Per Option, Granted | $ / shares 0
Weighted-Average Exercise Price Per Option, Exercised | $ / shares 288.80
Weighted-Average Exercise Price Per Option, Forfeited | $ / shares 620.43
Weighted-Average Exercise Price Per Option, Expired | $ / shares 0
Weighted-Average Exercise Price Per Option, Outstanding, end of period | $ / shares 487.45
Weighted-Average Exercise Price Per Option, Expected to vest | $ / shares 670.73
Weighted-Average Exercise Price Per Option, Exercisable | $ / shares $ 376.64
Weighted average remaining contractual term  
Weighted-Average Remaining Contractual Term, Outstanding, years 4 years 4 months 24 days
Weighted-Average Remaining Contractual Term, Expected to vest, years 7 years 1 month 6 days
Weighted-Average Remaining Contractual Term, Exercisable, years 3 years 7 months 6 days
Aggregate intrinsic value  
Aggregate Intrinsic Value, Outstanding | $ $ 2,683,510,208
Aggregate Intrinsic Value, Expected to vest | $ 309,877,142
Aggregate Intrinsic Value, Exercisable | $ $ 2,287,395,248