Employee Benefits - Narrative (Details) - USD ($)	9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Retirement Benefits [Abstract]
Defined benefit plan, contributions by employer	$ 0	$ 5,000,000.0
Defined benefit plan, expected future employer contributions, remainder of fiscal year	$ 23,400,000
Expected rate of return on plan assets for determining net periodic pension cost	8.00%