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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 26, 2014
Apr. 27, 2013
Apr. 28, 2012
Allowance for Doubtful Accounts
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 2,718 $ 2,398 $ 2,548
Charged to Costs and Expenses 860 782 110
Charged to Other Accounts 0 0 0
Deductions (1,039) [1] (462) [1] (260) [1]
Balance at End of Year 2,539 2,718 2,398
Allowance for Excess and Obsolete Inventories
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 3,286 2,851 2,139
Charged to Costs and Expenses 1,219 3,094 2,537
Charged to Other Accounts (1) [2] 1 [2] 11 [2]
Deductions (1,812) [3] (2,660) [3] (1,836) [3]
Balance at End of Year $ 2,692 $ 3,286 $ 2,851
[1] Write-off of uncollected accounts, net of collections.
[2] Translation adjustment on foreign subsidiary balances.
[3] Obsolete and excess inventory disposals