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Benefit Plans - Schedule of Fair Value of Stock Options Estimated on Grant Date (Details)		3 Months Ended	12 Months Ended
	Oct. 06, 2020	Jan. 31, 2020	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected life (in years)				8 years	7 years
Risk-free interest rate	0.55%	1.81%	0.64%	1.63%	2.80%
Volatility					72.70%
Dividend yield					0.00%

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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-Publisher FASB
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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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