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Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 30, 2014
Components of accrued liabilities
Payroll and vacation	$ 19,454npci_AccruedSalariesandVacationCurrent	$ 16,535npci_AccruedSalariesandVacationCurrent
Deferred revenue, vendor rebates	5,838	391
Sales tax payable	5,157us-gaap_SalesAndExciseTaxPayableCurrent	4,978us-gaap_SalesAndExciseTaxPayableCurrent
Other	20,405us-gaap_OtherAccruedLiabilitiesCurrent	21,493us-gaap_OtherAccruedLiabilitiesCurrent
Total Accrued liabilities	$ 50,854us-gaap_AccruedLiabilitiesCurrent	$ 43,397us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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