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Segment and geographical information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 26, 2014
Sep. 26, 2014
Jun. 27, 2014
Mar. 28, 2014
Dec. 27, 2013
Sep. 27, 2013
Jun. 28, 2013
Mar. 29, 2013
Dec. 26, 2014
segment
Dec. 27, 2013
Segment Reporting Information [Line Items]                    
Number of Reportable Segments                 3us-gaap_NumberOfReportableSegments  
Net sales: $ 80,110us-gaap_SalesRevenueNet $ 88,205us-gaap_SalesRevenueNet $ 93,567us-gaap_SalesRevenueNet $ 81,652us-gaap_SalesRevenueNet $ 87,772us-gaap_SalesRevenueNet $ 94,840us-gaap_SalesRevenueNet $ 88,258us-gaap_SalesRevenueNet $ 84,806us-gaap_SalesRevenueNet $ 343,534us-gaap_SalesRevenueNet $ 355,676us-gaap_SalesRevenueNet
Segment operating profit                 9,412puls_OperatingProfitLossExcludingSeveranceImpairmentAndOtherAssociatedCostsDebtRestructuringAndRelatedCostsLegalReserveNetAndCostsRelatedToUnsolicitedTakeoverAttempt 7,773puls_OperatingProfitLossExcludingSeveranceImpairmentAndOtherAssociatedCostsDebtRestructuringAndRelatedCostsLegalReserveNetAndCostsRelatedToUnsolicitedTakeoverAttempt
Severance, impairment and other associated costs                 3,937us-gaap_RestructuringSettlementAndImpairmentProvisions 3,342us-gaap_RestructuringSettlementAndImpairmentProvisions
CEO transition costs                 4,128puls_ExecutiveTransitionCosts 0puls_ExecutiveTransitionCosts
Legal entity restructuring costs                 1,264us-gaap_RestructuringCosts 0us-gaap_RestructuringCosts
Legal reserve                 43puls_LegalReserveNet 147puls_LegalReserveNet
Operating profit                 40us-gaap_OperatingIncomeLoss 4,284us-gaap_OperatingIncomeLoss
Interest expense, net                 26,317us-gaap_InterestIncomeExpenseNet 24,492us-gaap_InterestIncomeExpenseNet
Other expense, net                 (1,829)us-gaap_NonoperatingIncomeExpense (2,432)us-gaap_NonoperatingIncomeExpense
Loss before income taxes                 (28,106)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (22,640)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Depreciation and amortization                 7,234us-gaap_DepreciationDepletionAndAmortization 7,393us-gaap_DepreciationDepletionAndAmortization
Network [Member]                    
Segment Reporting Information [Line Items]                    
Net sales:                 152,602us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= puls_NetworkMember
150,570us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= puls_NetworkMember
Segment operating profit (loss)                 7,124puls_OperatingProfitLossFromContinuingOperationsBeforeSeveranceImpairmentAndOtherAssociatedCostsDebtRestructuringAndRelatedCostsLegalReserveNetAndCostsRelatedToUnsolicitedTakeoverAttempt
/ us-gaap_StatementBusinessSegmentsAxis
= puls_NetworkMember
4,839puls_OperatingProfitLossFromContinuingOperationsBeforeSeveranceImpairmentAndOtherAssociatedCostsDebtRestructuringAndRelatedCostsLegalReserveNetAndCostsRelatedToUnsolicitedTakeoverAttempt
/ us-gaap_StatementBusinessSegmentsAxis
= puls_NetworkMember
Depreciation and amortization                 2,219us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= puls_NetworkMember
2,102us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= puls_NetworkMember
Power [Member]                    
Segment Reporting Information [Line Items]                    
Net sales:                 105,936us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= puls_PowerMember
111,544us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= puls_PowerMember
Segment operating profit (loss)                 9,029puls_OperatingProfitLossFromContinuingOperationsBeforeSeveranceImpairmentAndOtherAssociatedCostsDebtRestructuringAndRelatedCostsLegalReserveNetAndCostsRelatedToUnsolicitedTakeoverAttempt
/ us-gaap_StatementBusinessSegmentsAxis
= puls_PowerMember
7,607puls_OperatingProfitLossFromContinuingOperationsBeforeSeveranceImpairmentAndOtherAssociatedCostsDebtRestructuringAndRelatedCostsLegalReserveNetAndCostsRelatedToUnsolicitedTakeoverAttempt
/ us-gaap_StatementBusinessSegmentsAxis
= puls_PowerMember
Depreciation and amortization                 1,243us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= puls_PowerMember
1,286us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= puls_PowerMember
Wireless [Member]                    
Segment Reporting Information [Line Items]                    
Net sales:                 84,996us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= puls_WirelessMember
93,562us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= puls_WirelessMember
Segment operating profit (loss)                 (6,741)puls_OperatingProfitLossFromContinuingOperationsBeforeSeveranceImpairmentAndOtherAssociatedCostsDebtRestructuringAndRelatedCostsLegalReserveNetAndCostsRelatedToUnsolicitedTakeoverAttempt
/ us-gaap_StatementBusinessSegmentsAxis
= puls_WirelessMember
(4,673)puls_OperatingProfitLossFromContinuingOperationsBeforeSeveranceImpairmentAndOtherAssociatedCostsDebtRestructuringAndRelatedCostsLegalReserveNetAndCostsRelatedToUnsolicitedTakeoverAttempt
/ us-gaap_StatementBusinessSegmentsAxis
= puls_WirelessMember
Depreciation and amortization                 $ 3,772us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= puls_WirelessMember
$ 4,005us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= puls_WirelessMember