Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of increase in unrecognized tax benefits resulting from settlements with taxing authorities.

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Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense

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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Apr. 29, 2018	Apr. 30, 2017	Apr. 29, 2018	Apr. 30, 2017	Oct. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision (benefit)	$ 630	$ (767)	$ (730)	$ (144)
Tax benefit from resolution of uncertain tax positions			1,100	$ 1,300
Tax Cuts And Jobs Act Of 2017, increase (decrease) of deferred tax assets	$ 300		$ (25,400)
Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Statutory income tax rate					23.40%