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STOCK AWARD PLANS - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 29, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2020
May 05, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum shares that can be granted under stock plan (shares)             4,261,884
Shares available for stock awards (shares)   1,679,519   1,679,519      
Stock-based compensation expense   $ 22,004,000 $ 15,667,000 $ 64,249,000 $ 37,309,000    
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation expense   1,100,000   1,100,000      
Stock-based compensation expense   1,094,000 $ 2,218,000 3,258,000 $ 6,678,000    
Stock awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation expense   194,500,000   $ 194,500,000      
Stock awards | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Discount on outstanding grants (percent)       11.00%      
Stock awards | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Discount on outstanding grants (percent)       23.00%      
Performance-based restricted stock units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock awards granted (shares) 318,801            
Weighted average grant date fair value (in dollars per share) $ 73.66            
Award vesting period 3 years     3 years      
Upside opportunity upon achievement of targets (percent) 200.00%     200.00%      
Time-based restricted stock units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock awards granted (shares) 604,468            
Weighted average grant date fair value (in dollars per share) $ 73.66            
Award vesting period 3 years     3 years   5 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period 2 years            
1997 Employee Stock Purchase Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum employee contribution to purchase company stock   $ 10,000   $ 10,000      
Discount rate used to determine the purchase price       15.00%