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v3.26.1

Supplemental Financial Information (Schedule Of Cash Flow Information (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 27, 2026 | Jun. 28, 2025
Supplemental Financial Information |  |
Interest | $ 41 | $ 20
Debt financing of insurance | 438 | $ 537
Lease modification to increase operating lease assets | $ 999 |

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- Definition Debt Financing of Insurance + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Lease Modification To Increase Operating Lease Assets + References No definition available. + Details
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Namespace Prefix: | nlst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of the required periodic payments applied to interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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