Non-controlling and Other Beneficial Interests (Details) - USD ($) $ in Thousands	12 Months Ended
Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Noncontrolling Interest [Line Items]
Net (income) loss attributable to non-controlling and other beneficial interests	$ 5,182	$ (32,841)	$ (15,967)
Consolidated Sponsored Funds [Member]
Noncontrolling Interest [Line Items]
Net (income) loss attributable to non-controlling and other beneficial interests	10,560	(20,081)	232
Majority-owned subsidiaries [Member]
Noncontrolling Interest [Line Items]
Net (income) loss attributable to non-controlling and other beneficial interests	$ (5,378)	$ (12,760)	$ (16,199)

Amount of Net Income (Loss) attributable to noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591551-111686

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