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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Sep. 30, 2025
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,
 202520242023
Risk-free interest rate
4.0% to 4.5%
4.1% to 4.7%
3.5% to 4.2%
Expected life of options
6.5 years
6.5 years
6.5 years
Expected dividend yield of stock
—
—
—
Expected volatility of stock
32.5%
33.5%
32.5%
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, 2025:
Number of
Options		Weighted-Average
Exercise Price Per
Option		Weighted-Average
Remaining
Contractual  Term		Aggregate
Intrinsic Value
Outstanding at September 30, 2024561,109 $795.95 
Granted346,664 1,316.43 
Exercised(26,420)656.47 
Forfeited(121,745)909.08 
Expired— — 
Outstanding at September 30, 2025759,608 $1,020.20 
8.4 years
$226,226,455 
Expected to vest409,971 $1,051.67 
8.5 years
$109,195,776 
Exercisable at September 30, 202593,696 $724.47 
7.6 years
$55,613,261 
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, 2025:
Number of
Options		Weighted-Average
Exercise Price Per
Option		Weighted-Average
Remaining
Contractual  Term		Aggregate
Intrinsic Value
Outstanding at September 30, 20243,779,503 $466.18 
Granted— — 
Exercised(462,368)288.80 
Forfeited(86,209)620.43 
Expired— — 
Outstanding at September 30, 20253,230,926 $487.45 
4.4 years
$2,683,510,208 
Expected to vest478,730 $670.73 
7.1 years
$309,877,142 
Exercisable at September 30, 20252,429,832 $376.64 
3.6 years
$2,287,395,248