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Stock-Based Compensation (Tables)
6 Months Ended
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Activity [Table Text Block] A summary of the stock-based awards granted during the six month periods ended March 31, 2020 and 2019 is presented below:
 
Six Months Ended March 31,
 
2020
 
2019
 
Number Granted
 
Weighted Average Grant Date Fair Value
 
Number Granted
 
Weighted Average Grant Date Fair Value
 
 
 
 
 
 
 
 
Stock options
1,347,310

 
$
7.29

 
1,741,510

 
$
5.56

Restricted stock/units
1,864,026

 
41.55

 
2,307,864

 
33.43

Performance shares
476,939

 
42.48

 
583,989

 
36.28


Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
Six Months Ended
March 31,
 
2020
 
2019
Expected life of option (years)
6.5
 
6.4
Risk-free interest rate
1.67%
 
2.77%
Expected volatility of the Company’s stock
22.4%
 
21.8%
Expected dividend yield on the Company’s stock
2.49%
 
3.29%


Schedule of share-based payment award, performance share, valuation assumptions [Table Text Block]
 
Six Months Ended
March 31,
 
2020
 
2019
Risk-free interest rate
1.60%
 
2.76%
Expected volatility of the Company’s stock
21.8%
 
22.9%