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Accrued Expenses - Summary of Accrued Contract Termination Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Accrued Liabilities and Other Liabilities [Abstract]    
Accrued contract termination costs-beginning balance $ 93pbpb_ContractTerminationCosts $ 151pbpb_ContractTerminationCosts
Contract termination costs incurred 749pbpb_ContractTerminationCostsIncurred 13pbpb_ContractTerminationCostsIncurred
Contract termination costs settled and paid (41)pbpb_ContractTerminationCostsSettledAndPaid (71)pbpb_ContractTerminationCostsSettledAndPaid
Accrued contract termination costs-ending balance $ 801pbpb_ContractTerminationCosts $ 93pbpb_ContractTerminationCosts