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CONSOLIDATED BALANCE SHEETS PARENTHETICAL (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 26, 2014
Dec. 27, 2013
CONSOLIDATED BALANCE SHEETS    
Receivables allowances $ 8,100ggg_AllowancesForDoubtfulAccountsAndSales $ 6,300ggg_AllowancesForDoubtfulAccountsAndSales
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common shares authorized 97,000,000us-gaap_CommonStockSharesAuthorized 97,000,000us-gaap_CommonStockSharesAuthorized
Common shares outstanding 59,198,527us-gaap_CommonStockSharesOutstanding 61,003,203us-gaap_CommonStockSharesOutstanding