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Income taxes - Deferred tax assets and liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 26, 2014
Dec. 27, 2013
Assets:    
Inventories $ 1,231us-gaap_DeferredTaxAssetsInventory $ 936us-gaap_DeferredTaxAssetsInventory
Plant and equipment 4,913us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 5,145us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Vacation pay and other compensation 1,082us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences 234us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences
Pension expense 1,934us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 1,100us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Stock awards 1,523us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,194us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued liabilities 2,065us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 1,896us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Net operating losses – federal, state and foreign 21,816us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 19,739us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credits 8,736us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 7,368us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Acquired intangibles 2,119us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 2,851us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Other 4,142us-gaap_DeferredTaxAssetsOther 5,844us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 49,561us-gaap_DeferredTaxAssetsGross 46,307us-gaap_DeferredTaxAssetsGross
Valuation allowance (41,277)us-gaap_DeferredTaxAssetsValuationAllowance (38,191)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 8,284us-gaap_DeferredTaxAssetsNet 8,116us-gaap_DeferredTaxAssetsNet
Liabilities:    
Foreign earnings not permanently invested 8,883us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 9,243us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Restructuring 1,551puls_DeferredTaxLiabilitiesRestructuring 1,551puls_DeferredTaxLiabilitiesRestructuring
Acquired intangibles 639us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 583us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Other 3,272us-gaap_DeferredTaxLiabilitiesOther 3,653us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 14,345us-gaap_DeferredIncomeTaxLiabilities 15,030us-gaap_DeferredIncomeTaxLiabilities
Total deferred tax liabilities 6,061us-gaap_DeferredTaxLiabilities 6,914us-gaap_DeferredTaxLiabilities
Current tax assets (included in prepaid expenses and other current assets) 2,140us-gaap_DeferredTaxAssetsNetCurrent 1,305us-gaap_DeferredTaxAssetsNetCurrent
Current tax liabilities (included in accrued expenses and other liabilities) (21)us-gaap_DeferredTaxLiabilitiesCurrent (990)us-gaap_DeferredTaxLiabilitiesCurrent
Non-current tax assets 2,071us-gaap_DeferredTaxAssetsNetNoncurrent 4,557us-gaap_DeferredTaxAssetsNetNoncurrent
Non-current tax liabilities $ (10,251)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (11,786)us-gaap_DeferredTaxLiabilitiesNoncurrent