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Accounts Receivable - Textual (Details) (USD $)
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Accounts Receivable (Additional Textual) [Abstract]    
Sold receivables amount $ 7,700,000nano_ProceedsFromAccountsReceivable $ 6,300,000nano_ProceedsFromAccountsReceivable
Gains or losses on sale of accounts receivables   0us-gaap_GainLossOnSaleOfAccountsReceivable
Due from unrelated third parties $ 0nano_DueFromUnrelatedThirdParties $ 0nano_DueFromUnrelatedThirdParties
Minimum [Member]    
Accounts Receivable (Textual) [Abstract]    
Administrative fees as well as interest percent 1.17%nano_AdministrativeFeesAndInterestPercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member]    
Accounts Receivable (Textual) [Abstract]    
Administrative fees as well as interest percent 1.68%nano_AdministrativeFeesAndInterestPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember