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Retirement Plans - Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Retirement Benefits [Abstract]
Administrative expenses	$ 69	$ 69	$ 138	$ 139
Interest cost	138	161	275	321
Expected return on plan assets	(236)	(247)	(472)	(495)
Prior service cost	11	11	22	22
Recognized actuarial loss	184	185	368	370
Net periodic benefit cost	$ 166	$ 179	$ 331	$ 357

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