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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Weighted Average Assumptions for all Options Granted Estimated at Grant Date Using Black-Scholes-Merton Option-Pricing Model
The fair value of the Company’s employee stock options was estimated at the date of grant or modification using a Black-Scholes option-pricing model with the following weighted average assumptions for all options granted during the fiscal years ended:
 Fiscal Years Ended September 30,
 202420232022
Risk-free interest rate
4.14% to 4.68%
3.45% to 4.20%
1.47% to 2.97%
Expected life of options
6.5 years
6.5 years
6.5 years
Expected dividend yield of stock
—
—
—
Expected volatility of stock
33.5%
32.5%
37.0% to 38.0%
Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2024:
Number of
Options		Weighted-Average
Exercise Price Per
Option		Weighted-Average
Remaining
Contractual  Term		Aggregate
Intrinsic Value
Outstanding at September 30, 2023223,945 $627.81 
Granted398,729 889.08 
Exercised(3,521)631.12 
Forfeited(58,044)792.32 
Expired— — 
Outstanding at September 30, 2024561,109 $795.95 
8.8 years
$354,160,779 
Expected to vest309,408 $833.09 
8.9 years
$183,800,728 
Exercisable at September 30, 2024120,116 $712.29 
8.5 years
$85,863,473 
The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2024:
Number of
Options		Weighted-Average
Exercise Price Per
Option		Weighted-Average
Remaining
Contractual  Term		Aggregate
Intrinsic Value
Outstanding at September 30, 20234,246,321 $443.02 
Granted158,550 971.00 
Exercised(529,387)316.35 
Forfeited(95,981)611.34 
Expired— — 
Outstanding at September 30, 20243,779,503 $466.18 
5.2 years
$3,631,913,408 
Expected to vest785,057 $653.01 
7.6 years
$607,728,325 
Exercisable at September 30, 20242,892,840 $390.75 
4.5 years
$2,998,078,391 
The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2024:
Number of
Options		Weighted-Average
Exercise Price Per
Option		Weighted-Average
Remaining
Contractual  Term		Aggregate
Intrinsic Value
Outstanding at September 30, 2023450,192 $211.49 
Granted— — 
Exercised(375,977)199.71 
Forfeited— — 
Expired— — 
Outstanding at September 30, 202474,215 $226.34 
1.1 years
$89,116,630 
Exercisable at September 30, 202474,215 $226.34 
1.1 years
$89,116,630