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STOCKHOLDERS' EQUITY AND EQUITY INSTRUMENTS - Schedule of Options Outstanding and Exercisable (Details) - $ / shares
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Options outstanding (in shares) 107,261 187,023
Weighted-average remaining contractual life (years) 1 year 10 months 24 days  
Weighted-average exercise price of options outstanding (in dollars per share) $ 63.43  
Options exercisable (in shares) 101,537  
Weighted-average remaining contractual life, options exercisable 1 year 9 months 18 days  
Weighted-average exercise price of exercisable options (in dollars per share) $ 62.84  
$54.44 - $56.96    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Exercise price range, lower range limit (in dollars per share) 54.44  
Exercise price range, upper range limit (in dollars per share) $ 56.96  
Options outstanding (in shares) 22,428  
Weighted-average remaining contractual life (years) 6 months  
Weighted-average exercise price of options outstanding (in dollars per share) $ 55.00  
Options exercisable (in shares) 22,305  
Weighted-average remaining contractual life, options exercisable 6 months  
Weighted-average exercise price of exercisable options (in dollars per share) $ 55.00  
$56.97 - $61.03    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Exercise price range, lower range limit (in dollars per share) 56.97  
Exercise price range, upper range limit (in dollars per share) $ 61.03  
Options outstanding (in shares) 22,665  
Weighted-average remaining contractual life (years) 1 year 3 months 18 days  
Weighted-average exercise price of options outstanding (in dollars per share) $ 58.91  
Options exercisable (in shares) 22,665  
Weighted-average remaining contractual life, options exercisable 1 year 3 months 18 days  
Weighted-average exercise price of exercisable options (in dollars per share) $ 58.91  
$61.04 - $67.81    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Exercise price range, lower range limit (in dollars per share) 61.04  
Exercise price range, upper range limit (in dollars per share) $ 67.81  
Options outstanding (in shares) 34,693  
Weighted-average remaining contractual life (years) 2 years 3 months 18 days  
Weighted-average exercise price of options outstanding (in dollars per share) $ 63.14  
Options exercisable (in shares) 34,693  
Weighted-average remaining contractual life, options exercisable 2 years 3 months 18 days  
Weighted-average exercise price of exercisable options (in dollars per share) $ 63.14  
$67.82 - $73.49    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Exercise price range, lower range limit (in dollars per share) 67.82  
Exercise price range, upper range limit (in dollars per share) $ 73.49  
Options outstanding (in shares) 1,034  
Weighted-average remaining contractual life (years) 3 years  
Weighted-average exercise price of options outstanding (in dollars per share) $ 72.48  
Options exercisable (in shares) 776  
Weighted-average remaining contractual life, options exercisable 3 years  
Weighted-average exercise price of exercisable options (in dollars per share) $ 72.48  
$73.50 - $74.49    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Exercise price range, lower range limit (in dollars per share) 73.50  
Exercise price range, upper range limit (in dollars per share) $ 74.49  
Options outstanding (in shares) 26,441  
Weighted-average remaining contractual life (years) 3 years  
Weighted-average exercise price of options outstanding (in dollars per share) $ 74.49  
Options exercisable (in shares) 21,098  
Weighted-average remaining contractual life, options exercisable 3 years  
Weighted-average exercise price of exercisable options (in dollars per share) $ 74.49