Balance Sheet Information Schedule of Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2015
Dec. 28, 2014
Accounts Receivable, Net, Current [Abstract]    
Customers $ 211,793 $ 190,321
Allowances for cash discounts, bad debts and returns (7,249) (6,801)
Subtotal 204,544 183,520
Other receivables 7,088 7,234
Total $ 211,632 $ 190,754