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Employee benefit plans - Additional Information (Details) (USD $)
12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Expected contributions to defined benefit plans in next fiscal year $ 100,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear  
Benefit payments in 2015 2,000,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths  
Defined contribution pension plan expense of non-U.S. subsidiaries 900,000puls_DefinedContributionPensionPlanExpenseOfNonUSSubsidiaries 1,100,000puls_DefinedContributionPensionPlanExpenseOfNonUSSubsidiaries
Contribution expense under 401(k) plans 500,000us-gaap_DefinedContributionPlanCostRecognized 700,000us-gaap_DefinedContributionPlanCostRecognized
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accumulated benefit obligation 41,500,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
36,700,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Benefit payments in 2015 2,041,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Maximum [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Pension cost expected to be amortized from accumulated other comprehensive income $ 100,000us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear
/ us-gaap_RangeAxis
= us-gaap_MaximumMember