v3.26.3
STOCK-BASED COMPENSATION - Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity (Detail) - Performance Vested Stock Options
 12 Months Ended
Sep. 30, 2026
USD ($)
$ / shares
shares
2019 Stock Option Plan  
Number of Options  
Number of Options, Outstanding, beginning of period | shares 759,608
Number of Options, Granted | shares 631,757
Number of Options, Exercised | shares (19,970)
Number of Options, Forfeited | shares (127,777)
Number of Options, Expired | shares (2,394)
Number of Options, Outstanding, end of period | shares 1,241,224
Number of Options, Expected to vest | shares 747,635
Number of Options Exercisable at end of period | shares 174,374
Weighted average exercise price per option  
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period | $ / shares $ 1,020.2
Weighted-Average Exercise Price Per Option, Granted | $ / shares 1,256.82
Weighted-Average Exercise Price Per Option, Exercised | $ / shares 729.42
Weighted-Average Exercise Price Per Option, Forfeited | $ / shares 1,153.67
Weighted-Average Exercise Price Per Option, Expired | $ / shares 1,305.54
Weighted-Average Exercise Price Per Option, Outstanding, end of period | $ / shares 1,131.02
Weighted-Average Exercise Price Per Option, Expected to vest | $ / shares 1,170.62
Weighted-Average Exercise Price Per Option, Exercisable | $ / shares $ 866.87
Weighted average remaining contractual term  
Weighted-Average Remaining Contractual Term, Outstanding, years 8 years 3 months 18 days
Weighted-Average Remaining Contractual Term, Expected to vest, years 8 years 7 months 6 days
Weighted-Average Remaining Contractual Term, Exercisable, years 6 years 9 months 18 days
Aggregate intrinsic value  
Aggregate Intrinsic Value, Outstanding | $ $ 111,598,907
Aggregate Intrinsic Value, Expected to vest | $ 41,596,994
Aggregate Intrinsic Value, Exercisable | $ $ 47,466,690
2014 Stock Option Plan  
Number of Options  
Number of Options, Outstanding, beginning of period | shares 3,230,926
Number of Options, Granted | shares 0
Number of Options, Exercised | shares (495,226)
Number of Options, Forfeited | shares (73,165)
Number of Options, Expired | shares 0
Number of Options, Outstanding, end of period | shares 2,662,535
Number of Options, Expected to vest | shares 191,041
Number of Options Exercisable at end of period | shares 2,207,899
Weighted average exercise price per option  
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period | $ / shares $ 487.45
Weighted-Average Exercise Price Per Option, Granted | $ / shares 0
Weighted-Average Exercise Price Per Option, Exercised | $ / shares 281.30
Weighted-Average Exercise Price Per Option, Forfeited | $ / shares 616.14
Weighted-Average Exercise Price Per Option, Expired | $ / shares 0
Weighted-Average Exercise Price Per Option, Outstanding, end of period | $ / shares 522.25
Weighted-Average Exercise Price Per Option, Expected to vest | $ / shares 670.36
Weighted-Average Exercise Price Per Option, Exercisable | $ / shares $ 422.39
Weighted average remaining contractual term  
Weighted-Average Remaining Contractual Term, Outstanding, years 3 years 6 months
Weighted-Average Remaining Contractual Term, Expected to vest, years 6 years 4 months 24 days
Weighted-Average Remaining Contractual Term, Exercisable, years 3 years
Aggregate intrinsic value  
Aggregate Intrinsic Value, Outstanding | $ $ 1,676,206,812
Aggregate Intrinsic Value, Expected to vest | $ 79,803,044
Aggregate Intrinsic Value, Exercisable | $ $ 1,459,127,942