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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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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.

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