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EQUITY - Certain Information Pertaining to Stock Option Awards (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Compensation costs not yet recognized $ 0.6  
Weighted average period of compensation cost recognition 10 months  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 3.8  
Remaining unexercisable stock options, net (shares) 400,000  
Weighted average exercise price (USD per share) $ 68.65  
Intrinsic value $ 7.1  
Average remaining term 7 years 9 months 10 days  
Awards Outstanding    
No. of Options (shares) 1,443,916 1,517,310
Wtd. Avg. Remaining Life 5 years 7 days  
Wtd. Avg. Exercise Price (USD per share) $ 53.20 $ 53.05
Awards Exercisable    
No. of Options (shares) 1,017,603  
Wtd. Avg. Remaining Life 3 years 10 months 3 days  
Wtd. Avg. Exercise Price (USD per share) $ 46.72  
$20.59 - $20.59    
Range of Exercise Price    
Range of exercise price, minimum (USD per share) 20.59  
Range of exercise price, maximum (USD per share) $ 20.59  
Awards Outstanding    
No. of Options (shares) 200,000  
Wtd. Avg. Remaining Life 6 months 3 days  
Wtd. Avg. Exercise Price (USD per share) $ 20.59  
Awards Exercisable    
No. of Options (shares) 200,000  
Wtd. Avg. Remaining Life 6 months 3 days  
Wtd. Avg. Exercise Price (USD per share) $ 20.59  
$38.81 - $$49.19    
Range of Exercise Price    
Range of exercise price, minimum (USD per share) 38.81  
Range of exercise price, maximum (USD per share) $ 49.19  
Awards Outstanding    
No. of Options (shares) 400,000  
Wtd. Avg. Remaining Life 2 years 11 months 5 days  
Wtd. Avg. Exercise Price (USD per share) $ 45.22  
Awards Exercisable    
No. of Options (shares) 400,000  
Wtd. Avg. Remaining Life 2 years 11 months 5 days  
Wtd. Avg. Exercise Price (USD per share) $ 45.22  
$63.43 - $68.68    
Range of Exercise Price    
Range of exercise price, minimum (USD per share) 63.43  
Range of exercise price, maximum (USD per share) $ 68.68  
Awards Outstanding    
No. of Options (shares) 800,000  
Wtd. Avg. Remaining Life 7 years 4 months 10 days  
Wtd. Avg. Exercise Price (USD per share) $ 66.26  
Awards Exercisable    
No. of Options (shares) 400,000  
Wtd. Avg. Remaining Life 6 years 10 months 2 days  
Wtd. Avg. Exercise Price (USD per share) $ 63.49