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Defined Benefit Pension Plan - Expected Return on Assets (Details)
Sep. 30, 2021
Sep. 30, 2020
Defined benefit pension plan    
Total 100.00% 100.00%
Equity securities    
Defined benefit pension plan    
Total 21.00% 20.60%
Corporate bonds    
Defined benefit pension plan    
Total 53.00% 53.00%
Diversified fund    
Defined benefit pension plan    
Total 26.00% 26.00%
Cash    
Defined benefit pension plan    
Total 0.00% 0.40%