Debt (Details) - USD ($) $ in Thousands	Jul. 24, 2015	Apr. 24, 2015
Debt Instrument [Line Items]
Total borrowings	$ 491,057	$ 451,085
Less current portion	(413)	(409)
Long term debt	490,644	450,676
Credit Agreement borrowings
Debt Instrument [Line Items]
Total borrowings	487,668	447,599
R&D Loan
Debt Instrument [Line Items]
Total borrowings	2,529	2,631
Interest-free loan
Debt Instrument [Line Items]
Total borrowings	$ 860	$ 855

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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