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Retirement Plans - Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Retirement Benefits [Abstract]
Administrative expenses	$ 69	$ 47	$ 139	$ 94
Interest cost	161	207	321	414
Expected return on plan assets	(247)	(272)	(495)	(544)
Prior service cost	11	11	22	22
Recognized actuarial loss	185	100	370	201
Net periodic benefit cost	$ 179	$ 93	$ 357	$ 187

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