SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - Software and platform	12 Months Ended
Oct. 31, 2020
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of intangible assets	2 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of intangible assets	10 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration