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STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 18, 2025
USD ($)
executive
$ / shares
shares
Nov. 12, 2024
USD ($)
Mar. 20, 2024
shares
Feb. 20, 2024
USD ($)
$ / shares
shares
Sep. 05, 2023
$ / shares
shares
Feb. 17, 2022
shares
Sep. 30, 2025
USD ($)
executive
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2023
USD ($)
$ / shares
Jan. 30, 2020
shares
Jan. 31, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Accrued dividends | $             $ 2,962        
Share-based payment award, number of shares authorized (in shares)             3,527,590        
Number of additional shares authorized (in shares)           1,200,000          
Number of shares issued out of treasury stock (in shares)             590,366        
Stock repurchase program, authorized amount, period income (decrease) | $   $ 400,000                  
Stock repurchased during period (in shares)       1,500,000     1,897,182        
Stock repurchased during period | $       $ 98,250     $ 134,680        
Shares acquired, average cost per share (in dollars per share) | $ / shares       $ 65.50     $ 70.99        
Excise tax price | $             $ 1,329        
Stock repurchase program, remaining authorized repurchase amount | $             $ 298,013        
Common stock, par value (in dollars per share) | $ / shares       $ 0.25     $ 0.25 $ 0.25      
Shares paid for tax withholding for share based compensation (in shares)             583,978        
Shares paid for tax withholding for share based compensation, value | $             $ 45,284        
Shares paid for tax withholding for share based compensation, value per share (in dollars per share) | $ / shares             $ 77.54        
Reversal of excise taxes to adjust for a benefit related to employee vesting | $             $ (528)        
Share repurchase program, employee vesting | $             (107)        
Stock repurchase program, exercise tax accrued | $             $ 694        
Voss Capital, LLC | Related Party                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock repurchased during period (in shares)         400,000   1,500,000        
Shares acquired, average cost per share (in dollars per share) | $ / shares         $ 41.87   $ 65.50        
Common stock, par value (in dollars per share) | $ / shares         $ 0.25   $ 0.25        
Stock repurchase program, authorized amount | $             $ 98,250        
Restricted Stock, Subject to Performance Conditions | Executive Officer and Key Employees                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Instruments grants in period (in shares)             137,479        
Restricted Stock, Subject to Performance Conditions | Senior Executives                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of recipients of stock-based compensation award | executive             4        
Share-based payment award, award vesting period             36 months        
Instruments grants in period (in shares)             436,947        
Equity instruments other than options, granted in period, fair value | $             $ 12,372        
Granted (in dollars per share) | $ / shares             $ 84.95        
Post-vesting holding period             2 years        
Restricted Stock, Subject to Performance Conditions | Senior Executives | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares to be vested if performance condition is attained (in shares)             72,827        
Target number of shares to be vested if performance condition is attained (in shares)             145,649        
Restricted Stock, Subject to Performance Conditions | Senior Executives | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares to be vested if performance condition is attained (in shares)             436,947        
Restricted Stock and Restricted Stock Units                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based payment award, award vesting period             3 years        
Instruments grants in period (in shares)             579,858        
Restricted Stock and Restricted Stock Units | Director                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based payment award, award vesting period             1 year        
Instruments grants in period (in shares)             15,940        
Equity instruments other than options, granted in period, fair value | $             $ 1,100        
Granted (in dollars per share) | $ / shares             $ 69.03        
Restricted Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based payment award, options, vested in period, fair value | $             $ 97,833 $ 80,861 $ 25,863    
Employee service share-based compensation, nonvested awards, compensation not yet recognized, share-based awards other than options | $             $ 37,911        
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition             1 year 9 months 18 days        
Instruments grants in period (in shares)             595,798        
Granted (in dollars per share) | $ / shares             $ 81.30        
Restricted Stock Units (RSUs), Subject to Performance Conditions | Executive Officer and Key Employees                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of recipients of stock-based compensation award | executive             43        
Share-based payment award, award vesting period             36 months        
Instruments grants in period (in shares)             5,432        
Equity instruments other than options, granted in period, fair value | $             $ 9,735        
Granted (in dollars per share) | $ / shares             $ 68.12        
Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based payment award, number of shares authorized (in shares)             8,850,000     1,700,000 1,000,000
Number of additional shares authorized (in shares)     2,600,000                
Share-based payment award, expiration period             10 years        
Maximum percentage of exercise price at grant date fair value             100.00%        
Share-based payment award, number of shares available for grant (in shares)             1,895,135        
Incentive Plan | Incentive Stock Options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based payment award, number of shares authorized (in shares)             600,000        
Subsequent Event                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock, dividends declared (in dollars per share) | $ / shares $ 0.22                    
Subsequent Event | Restricted Stock, Subject to Performance Conditions | Senior Executives                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of recipients of stock-based compensation award | executive 4                    
Share-based payment award, award vesting period 36 months                    
Instruments grants in period (in shares) 531,456                    
Post-vesting holding period 2 years                    
Target number of shares to be vested if performance condition is attained (in shares) 177,152                    
Subsequent Event | Restricted Stock, Subject to Performance Conditions | Senior Executives | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares to be vested if performance condition is attained (in shares) 88,578                    
Subsequent Event | Restricted Stock, Subject to Performance Conditions | Senior Executives | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares to be vested if performance condition is attained (in shares) 531,456                    
Subsequent Event | Restricted Stock, Subject to Performance Conditions | Executives and Key Employees                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based payment award, award vesting period 36 months                    
Subsequent Event | Restricted Stock and Restricted Stock Units                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Equity instruments other than options, granted in period, fair value | $ $ 15,073                    
Granted (in dollars per share) | $ / shares $ 85.09                    
Subsequent Event | Restricted Stock and Restricted Stock Units, Subject To Performance Conditions                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Instruments grants in period (in shares) 147,141                    
Subsequent Event | Restricted Stock and Restricted Stock Units, Subject To Performance Conditions | Executive Officer and Key Employees                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of recipients of stock-based compensation award | executive 29                    
Equity instruments other than options, granted in period, fair value | $ $ 9,855                    
Granted (in dollars per share) | $ / shares $ 66.86                    
O 2025 A Dividends                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock, dividends declared (in dollars per share) | $ / shares             $ 0.72        
O 2024 Dividends                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock, dividends declared (in dollars per share) | $ / shares               $ 0.60      
O 2023 Dividends                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock, dividends declared (in dollars per share) | $ / shares                 $ 0.45    
S 2023 Dividends                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock, dividends declared (in dollars per share) | $ / shares               $ 2.00