Management Actions - Narrative (Details) - Disposal Group, Not Discontinued Operations - Toro Underground Wind Down - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2020	Aug. 02, 2019	Jul. 31, 2020	Aug. 02, 2019	Oct. 31, 2020
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	$ 0		$ 900,000
Disposal group, inventory write-down		$ 7,200,000		$ 7,200,000
Accrued liabilities	$ 900,000		$ 900,000
Net Sales
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		$ 1,900,000		$ 1,900,000
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