Debt (Details) - USD ($) $ in Thousands	Oct. 23, 2015	Apr. 24, 2015
Debt Instrument [Line Items]
Total borrowings	$ 474,668	$ 451,085
Less current portion	(415)	(409)
Long-term debt	474,253	450,676
Credit Agreement borrowings
Debt Instrument [Line Items]
Total borrowings	471,377	447,599
R&D Loan
Debt Instrument [Line Items]
Total borrowings	2,426	2,631
Interest-free loan
Debt Instrument [Line Items]
Total borrowings	$ 865	$ 855

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