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Stock-Based Compensation (Tables)
 6 Months Ended
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation, Activity [Table Text Block] A summary of the stock-based awards granted during the six month periods ended March 31, 2019 and 2018 is presented below:
 
Six Months Ended March 31,
 
2019
 
2018
 
Number Granted
 
Weighted Average Grant Date Fair Value
 
Number Granted
 
Weighted Average Grant Date Fair Value
 
 
 
 
 
 
 
 
Stock options
1,741,510

 
$
5.56

 
1,355,595

 
$
7.05

Restricted stock/units
2,307,864

 
33.43

 
2,095,225

 
37.37

Performance shares
583,989

 
36.28

 
496,478

 
36.31
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
Six Months Ended
March 31,
 
2019
 
2018
Expected life of option (years)
6.4
 
6.5
Risk-free interest rate
2.77%
 
2.28%
Expected volatility of the Company’s stock
21.8%
 
23.7%
Expected dividend yield on the Company’s stock
3.29%
 
2.78%
Schedule of share-based payment award, performance share, valuation assumptions [Table Text Block]
 
Six Months Ended
March 31,
 
2019
 
2018
Risk-free interest rate
2.76%
 
1.92%
Expected volatility of the Company’s stock
22.9%
 
21.7%