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Intangible Assets and Goodwill - Narrative - Goodwill Impairment Test (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May. 02, 2015 USD ($) | May. 03, 2014 USD ($) | May. 02, 2015 USD ($) | May. 03, 2014 USD ($) | Apr. 27, 2013 USD ($) reporting_unit | May. 01, 2015 USD ($) reporting_unit | Apr. 26, 2013 USD ($) reporting_unit | Apr. 28, 2012 USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 1.7 | $ 13.0 | $ 1.7 | $ 13.0 | $ 12.9 | $ 13.0 | $ 17.2 | $ 16.4
Number of reporting units where fair value exceeded carrying value | reporting_unit |  |  |  |  | 3 |  |  |
Goodwill impairment charge |  |  | 11.1 | 0.0 | $ 4.3 |  |  |
Number of reporting units where Step 1 of goodwill impairment test was performed | reporting_unit |  |  |  |  | 4 |  |  |
Number of reporting units where fair value was less than carrying value | reporting_unit |  |  |  |  | 1 |  |  |
Minimum |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Percentage by which fair value exceeded carrying value |  |  |  |  | 16.00% |  |  |
Maximum |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Percentage by which fair value exceeded carrying value |  |  |  |  | 75.00% |  |  |
Interface |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill | 0.7 | 12.0 | 0.7 | 12.0 | $ 11.9 | $ 11.8 | $ 12.0 | 11.1
Number of reporting units with goodwill | reporting_unit |  |  |  |  |  | 2 | 2 |
Number of reporting units where fair value exceeded carrying value | reporting_unit |  |  |  |  |  | 2 |  |
Goodwill impairment charge |  |  | 11.1 | 0.0 | 0.0 |  |  |
Power Products |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | $ 1.0 | $ 5.2 | $ 5.3
Number of reporting units with goodwill | reporting_unit |  |  |  |  |  | 1 | 2 |
Goodwill impairment charge |  |  | 0.0 | $ 0.0 | $ 4.3 |  |  |
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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