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Note F - Accounts and Other Receivables, Net - Accounts and Other Receivables, Net (Details) (USD $)
Dec. 28, 2014
Mar. 30, 2014
Accounts Receivable, Gross, Current $ 10,831,000us-gaap_AccountsReceivableGrossCurrent $ 8,256,000us-gaap_AccountsReceivableGrossCurrent
Less: allowance for doubtful accounts 426,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 433,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts and other receivables, net 10,405,000us-gaap_AccountsAndOtherReceivablesNetCurrent 7,823,000us-gaap_AccountsAndOtherReceivablesNetCurrent
Branded Product Sales [Member]    
Accounts Receivable, Gross, Current 6,821,000us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nath_BrandedProductSalesMember		 5,141,000us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nath_BrandedProductSalesMember
Franchise and License Royalties [Member]    
Accounts Receivable, Gross, Current 2,153,000us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nath_FranchiseAndLicenseRoyaltiesMember		 1,658,000us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nath_FranchiseAndLicenseRoyaltiesMember
Other Receivables [Member]    
Accounts Receivable, Gross, Current $ 1,857,000us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nath_OtherReceivablesMember		 $ 1,457,000us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nath_OtherReceivablesMember