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Note N - Related Party Transactions (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Accounting Firm where Charles Raich Served as Managing Partner [Member]      
Related Party Transaction, Amounts of Transaction $ 160us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nath_AccountingFirmWhereCharlesRaichServedAsManagingPartnerMember
$ 130us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nath_AccountingFirmWhereCharlesRaichServedAsManagingPartnerMember
$ 136us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nath_AccountingFirmWhereCharlesRaichServedAsManagingPartnerMember
Fim where Lorber Serves as Consultant [Member]      
Related Party Transaction, Amounts of Transaction $ 24us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nath_FimWhereLorberServesAsConsultantMember
$ 24us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nath_FimWhereLorberServesAsConsultantMember
$ 25us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nath_FimWhereLorberServesAsConsultantMember