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Retirement and Post-Retirement Benefit Plans - Weighted Average Assumptions Used to Calculate the Projected Benefit Obligations (Details)
12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Defined Benefit Plans      
Defined benefit plans      
Discount rate used to determine benefit obligation 1.00% 1.20% 2.10%
Discount rate used to determine service cost 1.30% 1.60% 2.30%
Discount rate used to determine interest cost 0.80% 1.00% 1.80%
Expected increase in compensation levels 2.50% 2.50% 2.50%
Expected long-term return on plan assets 3.30% 4.10% 4.30%
Interest crediting rate 2.50% 2.50% 2.50%
Post-Retirement Benefit Plans      
Defined benefit plans      
Discount rate used to determine benefit obligation 2.80% 3.40% 4.90%
Discount rate used to determine service cost 2.60% 3.00% 4.40%
Discount rate used to determine interest cost 2.30% 3.20% 4.70%
Expected increase in compensation levels 0.00% 0.00% 0.00%
Expected long-term return on plan assets 2.30% 2.30% 2.60%
Interest crediting rate 2.70% 3.70% 3.70%