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Summary of Quarterly Results of Operations (Unaudited) - Narrative - Significant Items for Fiscal 2015 (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 03, 2015 | May. 02, 2015 | May. 02, 2015 | May. 03, 2014 | Apr. 27, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill impairment charge |  |  | $ 11.1 | $ 0.0 | $ 4.3
Malta | Foreign tax authority |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Valuation allowance, deferred tax asset |  | $ 5.0 |  |  |
Trace Laboratories |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Pre-tax gain on sale | $ 7.7 | 7.7 |  |  |
Interface |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill impairment charge |  |  | 11.1 | $ 0.0 | $ 0.0
TouchSensor | Interface |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill impairment charge |  | $ 11.1 | $ 11.1 |  |

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