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Restructuring - Schedule of Restructuring Costs by Reportable Segment (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 | Oct. 31, 2020 | May 02, 2020 | Oct. 26, 2019 | Oct. 31, 2020 | Oct. 26, 2019
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Costs | $ 2.8 | $ 4.2 | $ 0.2 | $ 0.5 | $ 7.6 | $ 0.5
Auto |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Costs |  | 3.9 |  | 0.2 | 5.9 | 0.2
Auto |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Costs |  | $ 0.3 |  | 0.2 | 0.9 | 0.2
Auto |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Costs |  |  |  |  | 0.7 |
Auto |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Costs |  |  |  | $ 0.1 |  | $ 0.1
Eliminations/Corporate [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Costs |  |  |  |  | $ 0.1 |

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