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Intangible Assets and Goodwill - Goodwill Impairment Test (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 27, 2013 reporting_unit	Apr. 27, 2013 reporting_unit	Apr. 28, 2012	Apr. 30, 2011	Jan. 26, 2013	May 01, 2010
Goodwill [Line Items]
Goodwill	$ 12,907	$ 12,907	$ 16,422	$ 16,422	$ 17,233	$ 12,096
Number of reporting units with goodwill	4	4
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	3	3
Number of reporting units where fair value was less than carrying value	1	1
Goodwill impairment charge	4,326	4,326	0	0
Minimum
Goodwill [Line Items]
Percentage by which fair value exceeded carrying value	16.00%	16.00%
Maximum
Goodwill [Line Items]
Percentage by which fair value exceeded carrying value	75.00%	75.00%
Interconnect
Goodwill [Line Items]
Goodwill	11,957	11,957	11,146	11,146	11,957	11,146
Number of reporting units with goodwill					2
Goodwill impairment charge		0
Power Products
Goodwill [Line Items]
Goodwill	950	950	5,276	5,276	5,276	950
Number of reporting units with goodwill					2
Goodwill impairment charge		$ 4,326

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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