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Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis by Level in the Fair Value Hierarchy (Details) - Measured on a Recurring Basis $ in Thousands	Oct. 31, 2019 USD ($)
Assets at fair value:
Equity securities	$ 17,346
Level 1
Assets at fair value:
Equity securities	17,346
Level 2
Assets at fair value:
Equity securities	0
Level 3
Assets at fair value:
Equity securities	$ 0

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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