Investments (Investments held at cost - Narrative) (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Oct. 31, 2019
Marketable Securities [Line Items]
Investments held at cost	$ 20,928	$ 20,904
Wealth Management Technology Firm [Member]
Marketable Securities [Line Items]
Investments held at cost	$ 19,000	$ 19,000

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

No definition available.

Name:	us-gaap_CostMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant