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Segment Information and Geographic Area Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 28, 2018 | Jan. 27, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | $ 908.3 | $ 816.5 | $ 809.1
Net Sales to Unaffiliated Customers | $ 249.0 | $ 228.0 | $ 230.1 | $ 201.2 | $ 219.7 | $ 195.6 | $ 209.3 | $ 191.9 | 908.3 | 816.5 | 809.1
Income/(Loss) from Operations |  |  |  |  |  |  |  |  | 118.3 | 110.8 | 109.7
Interest (Income) Expense, Net |  |  |  |  |  |  |  |  | 0.9 | (0.4) | (0.7)
Other Income, Net |  |  |  |  |  |  |  |  | (6.4) | (4.7) | (0.5)
Income before Income Taxes |  |  |  |  |  |  |  |  | 123.8 | 115.9 | 110.9
Depreciation and Amortization |  |  |  |  |  |  |  |  | 28.1 | 24.3 | 23.9
Identifiable Assets | 915.9 |  |  |  | 704.0 |  |  |  | 915.9 | 704.0 | 655.9
Transfers between Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Automotive |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income/(Loss) from Operations |  |  |  |  |  |  |  |  | 156.3 |  |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 21.3 |  | 15.6
Identifiable Assets | 632.7 |  |  |  |  |  |  |  | 632.7 |  | 418.4
Automotive | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 738.4 | 641.0 | 623.1
Net Sales to Unaffiliated Customers |  |  |  |  |  |  |  |  | 728.7 | 632.2 | 614.3
Income/(Loss) from Operations |  |  |  |  |  |  |  |  |  | 148.3 | 136.8
Depreciation and Amortization |  |  |  |  |  |  |  |  |  | 15.5 |
Identifiable Assets |  |  |  |  | 462.3 |  |  |  |  | 462.3 |
Automotive | Transfers between Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | (9.7) | (8.8) | (8.8)
Interface |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income/(Loss) from Operations |  |  |  |  |  |  |  |  | 5.0 |  |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 3.5 |  | 4.3
Identifiable Assets | 251.4 |  |  |  |  |  |  |  | 251.4 |  | 184.8
Interface | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 116.1 | 128.2 | 142.6
Net Sales to Unaffiliated Customers |  |  |  |  |  |  |  |  | 115.8 | 127.4 | 140.8
Income/(Loss) from Operations |  |  |  |  |  |  |  |  |  | (0.9) | 2.7
Depreciation and Amortization |  |  |  |  |  |  |  |  |  | 4.2 |
Identifiable Assets |  |  |  |  | 202.5 |  |  |  |  | 202.5 |
Interface | Transfers between Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | (0.3) | (0.8) | (1.8)
Power Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income/(Loss) from Operations |  |  |  |  |  |  |  |  | 14.0 |  |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 1.6 |  | 2.3
Identifiable Assets | 48.5 |  |  |  |  |  |  |  | 48.5 |  | 46.4
Power Products | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 63.4 | 56.5 | 54.1
Net Sales to Unaffiliated Customers |  |  |  |  |  |  |  |  | 63.2 | 56.3 | 53.5
Income/(Loss) from Operations |  |  |  |  |  |  |  |  |  | 11.5 | 9.4
Depreciation and Amortization |  |  |  |  |  |  |  |  |  | 2.8 |
Identifiable Assets |  |  |  |  | 46.2 |  |  |  |  | 46.2 |
Power Products | Transfers between Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | (0.2) | (0.2) | (0.6)
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income/(Loss) from Operations |  |  |  |  |  |  |  |  | (11.4) |  |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 0.8 |  | 0.6
Identifiable Assets | 8.1 |  |  |  |  |  |  |  | 8.1 |  | 5.0
Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 0.3 | 2.2 | 0.6
Net Sales to Unaffiliated Customers |  |  |  |  |  |  |  |  | 0.3 | 0.3 | 0.3
Income/(Loss) from Operations |  |  |  |  |  |  |  |  |  | (12.4) | (8.8)
Depreciation and Amortization |  |  |  |  |  |  |  |  |  | 1.0 |
Identifiable Assets |  |  |  |  | 5.2 |  |  |  |  | 5.2 |
Other | Transfers between Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 0.0 | (1.9) | (0.3)
Eliminations/Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  | (11.3)
Net Sales to Unaffiliated Customers |  |  |  |  |  |  |  |  | 0.3 | 0.3 | 0.2
Income/(Loss) from Operations |  |  |  |  |  |  |  |  | (45.6) | (35.7) | (30.4)
Depreciation and Amortization |  |  |  |  |  |  |  |  | 0.9 | 0.8 | 1.1
Identifiable Assets | $ (24.8) |  |  |  | $ (12.2) |  |  |  | (24.8) | (12.2) | 1.3
Eliminations/Corporate | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | (9.9) | (11.4) |
Eliminations/Corporate | Transfers between Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | $ 10.2 | $ 11.7 | $ 11.5

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