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Cash and Investments - Additional Information (Details) | 9 Months Ended | 12 Months Ended
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Sep. 24, 2016 | Dec. 26, 2015
Investments Debt And Equity Securities [Abstract] |  |
Investment maturity period, less than | 2 years | 2 years

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- Definition Investment maturity period, maximum. + References No definition available. + Details
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Namespace Prefix: | nano_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration