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Income taxes - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 04, 2018 | May 05, 2018 | Aug. 04, 2018 | Jul. 29, 2017 | Nov. 03, 2018
Tax Credit Carryforward [Line Items] |  |  |  |  |
Effective income tax rate, percent |  |  | 20.00% | 23.50% |
Provisional benefit |  | $ 0.6 | $ (0.3) | $ 2.6 |
Forecast |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Effective income tax rate, percent | 21.00% |  |  |  | 23.40%

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