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v3.26.1

Summary of Significant Accounting Policies - (Details) | 6 Months Ended
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Jun. 27, 2026 item
Minimum |
Impaired Long-Lived Assets Held and Used [Line Items] |
Fiscal period duration | 364 days
Maximum |
Impaired Long-Lived Assets Held and Used [Line Items] |
Fiscal period duration | 371 days
Number of weeks in a fiscal year | 53

X
- Definition Number of weeks in a fiscal year. + References No definition available. + Details
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Namespace Prefix: | nlst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |