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Segment, Geographic, Product and Significant Customer Information - Long-lived Tangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Dec. 27, 2014 | Dec. 28, 2013
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Long-lived tangible assets: |  |
Total long-lived tangible assets | $ 49,633 us-gaap_NoncurrentAssets | $ 47,439 us-gaap_NoncurrentAssets
United States [Member] |  |
Long-lived tangible assets: |  |
Total long-lived tangible assets | 47,729 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_DomesticCountryMember | 44,775 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_DomesticCountryMember
Japan [Member] |  |
Long-lived tangible assets: |  |
Total long-lived tangible assets | 71 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_JP | 125 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_JP
South Korea [Member] |  |
Long-lived tangible assets: |  |
Total long-lived tangible assets | 284 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_KP | 445 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_KP
All other [Member] |  |
Long-lived tangible assets: |  |
Total long-lived tangible assets | $ 1,549 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = nano_OtherCountriesMember | $ 2,094 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = nano_OtherCountriesMember

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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