Annual report pursuant to Section 13 and 15(d)

SHARE-BASED PAYMENTS - Assumptions Used in Estimating Fair Value (Details)

v3.8.0.1
SHARE-BASED PAYMENTS - Assumptions Used in Estimating Fair Value (Details) - All Plans - Restricted Stock
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 20.20% 20.70% 22.20%
Dividend yield 1.10% 1.00% 1.00%
Average risk-free interest rate 1.70% 1.70% 1.70%
Average expected term (years) 2 years 1 month 6 days 2 years 1 month 6 days 1 year 9 months 18 days