Income Taxes (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
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% | ||||