Components of Net Periodic Benefit Cost (Details) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Apr. 30, 2019	Jul. 31, 2019	Jul. 31, 2018
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 843,000	$ 791,000		$ 2,525,000	$ 2,375,000
Expected return on plan assets	(836,000)	(839,000)		(2,506,000)	(2,519,000)
Defined Benefit Plan, Amortization of Gain (Loss)	(288,000)	(328,000)		(861,000)	(984,000)
Net periodic (benefit) cost	295,000	280,000		880,000	840,000
Pension Contributions			$ 1,183,000	219,000
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	3,000	3,000		9,000	8,000
Expected return on plan assets	0	0		0	0
Defined Benefit Plan, Amortization of Gain (Loss)	(1,000)	(1,000)		(4,000)	(5,000)
Net periodic (benefit) cost	$ 4,000	$ 4,000		$ 13,000	$ 13,000