Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

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Management Actions - Narrative (Details) - Disposal Group, Not Discontinued Operations - Toro Underground Wind Down - USD ($)	3 Months Ended	12 Months Ended
	Jan. 31, 2020	Oct. 31, 2020	Oct. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, inventory write-down	$ 0		$ 10,000,000.0
Accrued liabilities	$ 900,000
Scenario, Forecast \| Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from individually significant component disposed of or held-for-sale, excluding discontinued operations, attributable to parent, before income tax		$ 10,000,000.0
Scenario, Forecast \| Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from individually significant component disposed of or held-for-sale, excluding discontinued operations, attributable to parent, before income tax		$ (11,000,000.0)