Employee Benefits - Weighted-Average Asset Allocations by Asset Category (Details)	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation	100.00%	100.00%	100.00%
Cash and cash equivalents
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation	11.80%	3.20%	2.10%
Corporate common stock
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation	0.00%	0.00%	14.50%
Equity mutual funds
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation	57.70%	63.70%	47.40%
Hedging Strategy Funds
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation	4.30%	4.90%	0.00%
Real estate funds
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation	0.00%	0.00%	2.70%
Bond mutual funds
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation	26.20%	28.20%	33.30%