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Supplemental Financial Information (Schedule Of Supplemental Disclosures Of Cash Flow Information And Non-Cash Financing Activities) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 01, 2017 | Apr. 02, 2016
Supplemental Financial Information |  |
Debt financing of insurance | $ 220 | $ 224

X
- Definition Debt Financing of Insurance + References No definition available. + Details
Name: | nlst_DebtFinancingOfInsurance
Namespace Prefix: | nlst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration