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SHARE-BASED COMPENSATION PLANS, Weighted Average Assumptions (Details) - $ / shares
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Stock Options [Member]      
Weighted Average Assumptions [Abstract]      
Weighted-average grant date fair value (in dollars per share) $ 26.59 $ 16.50 $ 14.47
Expected term 6 years 8 months 5 days 6 years 6 months 25 days 6 years 6 months 22 days
Expected volatility 26.00% 27.00% 26.00%
Risk-free rate of return 2.40% 2.10% 1.90%
Dividend yield 1.00% 1.20% 0.30%
Employee Stock Purchase Plan [Member]      
Weighted Average Assumptions [Abstract]      
Weighted-average grant date fair value - ESPP (in dollars per share) $ 20.94 $ 12.49 $ 9.57
Expected term 6 months 6 months 6 months
Expected volatility 26.00% 24.00% 24.00%
Risk-free rate of return 1.50% 0.60% 0.40%
Dividend yield 1.10% 1.30% 0.50%