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Income taxes - Effective income tax rate reconciliation (Details)
12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
U.S. statutory federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Non-deductible expenses and other (8.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense (21.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Withholding taxes (5.00%)puls_EffectiveIncomeTaxRateReconciliationWithholdingTaxes (5.00%)puls_EffectiveIncomeTaxRateReconciliationWithholdingTaxes
Tax credits 6.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Tax effect of valuation allowance (11.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses (8.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses
Foreign rate differential (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (25.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Effective tax rate (17.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (19.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations