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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