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Commitments, Contingent Liabilities and Other Matters - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Commitments and Contingencies Disclosure [Line Items]      
Future minimum sublease rentals $ 6.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals    
Total rental costs reflected in continuing operations 67.5us-gaap_LeaseAndRentalExpense 58.4us-gaap_LeaseAndRentalExpense 64.6us-gaap_LeaseAndRentalExpense
Self insurance liabilities 80.4us-gaap_SelfInsuranceReserve 92.0us-gaap_SelfInsuranceReserve  
Payment of potential earnout payments in connection with acquisition 22.4us-gaap_OtherPaymentsToAcquireBusinesses    
Programming Contracts      
Commitments and Contingencies Disclosure [Line Items]      
Purchase commitments under contract 213.5us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= gci_ProgrammingContractsMember
   
Printing contracts and Others      
Commitments and Contingencies Disclosure [Line Items]      
Purchase commitments under contract 240.9us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= gci_PrintingContractsAndOthersMember
   
Contractual Promotional Payments      
Commitments and Contingencies Disclosure [Line Items]      
Business exit costs $ 21.0us-gaap_BusinessExitCosts1
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= gci_ContractualPromotionalPaymentsMember