GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012	Apr. 28, 2012
Goodwill [Roll Forward]
Balance	$ 17,216	$ 16,422	$ 16,422	$ 16,422
Attributable to acquisitions	0	0	794	0
Balance	17,257	16,422	17,257	16,422
Gross	42,476		42,476		41,249
Accumulated Amortization	25,430		25,430		24,629
Net	17,046		17,046		16,620
Indefinite-lived trade names	1,800		1,800		1,800
Goodwill, Translation Adjustments	41		41
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2013	1,740		1,740
2014	1,822		1,822
2015	1,753		1,753
2016	1,543		1,543
2017	1,478		1,478
Customer relationships and agreements
Goodwill [Roll Forward]
Gross	16,579		16,579		14,995
Accumulated Amortization	14,033		14,033		13,720
Net	2,546		2,546		1,275
Wtd. Avg. Remaining Amortization Periods	11 years 4 months 24 days		11 years 4 months 24 days		11 years 8 months 12 days
Trade names, patents and technology licences
Goodwill [Roll Forward]
Gross	25,774		25,774		25,774
Accumulated Amortization	11,389		11,389		10,429
Net	14,385		14,385		15,345
Wtd. Avg. Remaining Amortization Periods	11 years 0 months 18 days		11 years 0 months 18 days		11 years 9 months 18 days
Covenants not to compete
Goodwill [Roll Forward]
Write-off of fully amortized intangible assets	480
Gross	123		123		480
Accumulated Amortization	8		8		480
Net	115		115		0
Interconnect
Goodwill [Roll Forward]
Balance	11,940	11,146	11,146	11,146
Attributable to acquisitions	0	0	794	0
Balance	11,981	11,146	11,981	11,146
Goodwill, Translation Adjustments	41		41
Power Products
Goodwill [Roll Forward]
Balance	5,276	5,276	5,276	5,276
Attributable to acquisitions	0	0	0	0
Balance	5,276	5,276	5,276	5,276
Goodwill, Translation Adjustments	$ 0		$ 0

Finite-lived and Indefinite-lived Intangible Assets, Excluding Goodwill, Gross

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Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period

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Fully Amortized Finite Lived Intangible Assets Write-off

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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