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Accounts Receivable - Textual (Details) - USD ($) | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017
Accounts Receivable (Additional Textual) [Abstract] |  |
Sold receivables amount | $ 64,300,000 | $ 18,600,000
Due from unrelated third parties | $ 0 | $ 0
Minimum [Member] |  |
Accounts Receivable (Textual) [Abstract] |  |
Administrative fees as well as interest percent | 0.62% |
Maximum [Member] |  |
Accounts Receivable (Textual) [Abstract] |  |
Administrative fees as well as interest percent | 1.48% |

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- Definition Accounts receivable. + References No definition available. + Details
Name: | nano_AccountsReceivableTextualAbstract
Namespace Prefix: | nano_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Administrative fees and interest percent. + References No definition available. + Details
Name: | nano_AdministrativeFeesAndInterestPercent
Namespace Prefix: | nano_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Due from unrelated third parties. + References No definition available. + Details
Name: | nano_DueFromUnrelatedThirdParties
Namespace Prefix: | nano_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Proceeds from accounts receivable. + References No definition available. + Details
Name: | nano_ProceedsFromAccountsReceivable
Namespace Prefix: | nano_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |