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Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2020 | Oct. 26, 2019 | Oct. 31, 2020 | Oct. 26, 2019 | May 02, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | $ 300.8 | $ 257.2 | $ 491.7 | $ 527.4 |
Income (Loss) from Operations | 45.0 | 30.7 | 58.8 | 69.3 |
Interest Expense, Net | 1.4 | 2.7 | 3.0 | 5.6 |
Other Income, Net | (2.6) | (1.0) | (6.0) | (0.9) |
Income before Income Taxes | 46.2 | 29.0 | 61.8 | 64.6 |
Identifiable Assets | 1,489.3 |  | 1,489.3 |  | $ 1,370.6
Auto |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 215.7 | 180.1 | 340.8 | 366.3 |
Income (Loss) from Operations | 38.8 | 28.9 | 54.1 | 62.0 |
Interest Expense, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Other Income, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Income before Income Taxes | 0.0 | 0.0 | 0.0 | 0.0 |
Identifiable Assets | 768.8 |  | 768.8 |  | 670.9
Industrial |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 67.9 | 64.9 | 119.9 | 135.7 |
Income (Loss) from Operations | 16.1 | 15.1 | 23.1 | 31.6 |
Interest Expense, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Other Income, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Income before Income Taxes | 0.0 | 0.0 | 0.0 | 0.0 |
Identifiable Assets | 432.8 |  | 432.8 |  | 421.8
Interface |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 16.4 | 11.9 | 29.8 | 24.8 |
Income (Loss) from Operations | 3.1 | (0.2) | 4.2 | 0.0 |
Interest Expense, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Other Income, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Income before Income Taxes | 0.0 | 0.0 | 0.0 | 0.0 |
Identifiable Assets | 88.0 |  | 88.0 |  | 71.0
Medical |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 0.8 | 0.3 | 1.2 | 0.6 |
Income (Loss) from Operations | (1.5) | (1.8) | (3.1) | (3.3) |
Interest Expense, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Other Income, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Income before Income Taxes | 0.0 | 0.0 | 0.0 | 0.0 |
Identifiable Assets | 7.8 |  | 7.8 |  | 8.8
Eliminations/Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 0.0 | 0.0 | 0.0 | 0.0 |
Income (Loss) from Operations | (11.5) | (11.3) | (19.5) | (21.0) |
Interest Expense, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Other Income, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Income before Income Taxes | 0.0 | 0.0 | 0.0 | 0.0 |
Identifiable Assets | 191.9 |  | 191.9 |  | $ 198.1
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 300.8 | 257.2 | 491.7 | 527.4 |
Operating Segments | Auto |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 216.9 | 181.3 | 343.3 | 368.8 |
Operating Segments | Industrial |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 69.5 | 65.4 | 121.9 | 137.0 |
Operating Segments | Interface |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 16.4 | 12.0 | 29.8 | 24.9 |
Operating Segments | Medical |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 0.8 | 0.3 | 1.2 | 0.6 |
Operating Segments | Eliminations/Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | (2.8) | (1.8) | (4.5) | (3.9) |
Transfers between Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 0.0 | 0.0 | 0.0 | 0.0 |
Transfers between Segments | Auto |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | (1.2) | (1.2) | (2.5) | (2.5) |
Transfers between Segments | Industrial |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | (1.6) | (0.5) | (2.0) | (1.3) |
Transfers between Segments | Interface |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 0.0 | (0.1) | 0.0 | (0.1) |
Transfers between Segments | Medical |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 0.0 | 0.0 | 0.0 | 0.0 |
Transfers between Segments | Eliminations/Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | $ 2.8 | $ 1.8 | $ 4.5 | $ 3.9 |

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