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Intangible Assets and Goodwill - Narrative - Goodwill Impairment Test (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2016 USD ($) reporting_unit | Apr. 30, 2016 USD ($) reporting_unit | May 02, 2015 USD ($) reporting_unit | May 03, 2014 USD ($) | Apr. 27, 2013 USD ($)
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 1.7 | $ 1.7 | $ 1.7 | $ 13.0 | $ 12.9
Goodwill impairment charge |  | $ 0.0 | 11.1 |  |
Number of reporting units where Step 1 of goodwill impairment test was performed | reporting_unit | 2 | 2 |  |  |
Minimum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Percentage by which fair value exceeded carrying value | 135.00% | 135.00% |  |  |
Maximum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Percentage by which fair value exceeded carrying value | 163.00% | 163.00% |  |  |
Interface |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 0.7 | $ 0.7 | $ 0.7 | 12.0 | 11.9
Number of reporting units with goodwill | reporting_unit | 1 | 1 |  |  |
Number of reporting units where fair value exceeded carrying value | reporting_unit |  |  | 2 |  |
Goodwill impairment charge |  | $ 0.0 | $ 11.1 |  |
Power Products |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 1.0 | $ 1.0 | 1.0 | 1.0 | $ 1.0
Number of reporting units with goodwill | reporting_unit | 1 | 1 |  |  |
Goodwill impairment charge |  | $ 0.0 | 0.0 |  |
TouchSensor | Interface |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment charge | $ 11.1 |  | $ 11.1 |  |
Eetrex | Power Products |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Asset impairment charge |  |  |  | $ 1.7 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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