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Intangible Assets and Goodwill - Goodwill Impairment Test (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended
Apr. 27, 2013
reporting_unit
May 03, 2014
Apr. 27, 2013
reporting_unit
Apr. 28, 2012
Jan. 26, 2013
Apr. 30, 2011
Apr. 27, 2013
Minimum
Apr. 27, 2013
Maximum
Apr. 27, 2013
Interconnect
May 03, 2014
Interconnect
reporting_unit
Jan. 26, 2013
Interconnect
reporting_unit
Apr. 28, 2012
Interconnect
Apr. 30, 2011
Interconnect
Apr. 27, 2013
Power Products
May 03, 2014
Power Products
reporting_unit
Jan. 26, 2013
Power Products
reporting_unit
Apr. 28, 2012
Power Products
Apr. 30, 2011
Power Products
May 03, 2014
Eetrex
Power Products
Goodwill [Line Items]                                      
Goodwill $ 12.9 $ 13.0 $ 12.9 $ 16.4 $ 17.2 $ 16.4     $ 11.9 $ 12.0 $ 12.0 $ 11.1 $ 11.1 $ 1.0 $ 1.0 $ 5.2 $ 5.3 $ 5.3  
Asset Impairment Charges                                     1.7
Number of reporting units with goodwill                   2 2       1 2      
Number of reporting units where Step 1 of goodwill impairment test was performed 4   4                                
Number of reporting units where fair value exceeded carrying value 2   2                                
Percentage by which fair value exceeded carrying value   17.00%         16.00% 75.00%                      
Number of reporting units where fair value was less than carrying value 1   1                                
Goodwill impairment charge $ 4.3 $ 1.7 $ 4.3 $ 0         $ 0         $ 4.3