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Earnings Per Share (Schedule of Reconciliation of Number of Shares Utilized in Earnings Per Share Calculations) (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Earnings Per Share [Abstract]      
Number of common shares-basic 112,593us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 112,254us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 113,728us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities, Stock options 922pki_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions 982pki_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions 847pki_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions
Effect of dilutive securities, Restricted stock 224pki_IncrementalCommonSharesAttributableToShareBasedPaymentsArrangementsRestrictedStockAwards 267pki_IncrementalCommonSharesAttributableToShareBasedPaymentsArrangementsRestrictedStockAwards 285pki_IncrementalCommonSharesAttributableToShareBasedPaymentsArrangementsRestrictedStockAwards
Number of common shares-diluted 113,739us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 113,503us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 114,860us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Number of potentially dilutive securities excluded from calculation due to antidilutive impact 475us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 485us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,288us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount