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Note B - Summary of Significant Accounting Policies - The Company's Revenues (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Revenues $ 99,112us-gaap_Revenues $ 79,752us-gaap_Revenues $ 71,069us-gaap_Revenues
Domestic [Member]      
Revenues 95,682us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= nath_DomesticMember		 76,221us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= nath_DomesticMember		 68,025us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= nath_DomesticMember
Non-domestic [Member]      
Revenues $ 3,430us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= nath_NonDomesticMember		 $ 3,531us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= nath_NonDomesticMember		 $ 3,044us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= nath_NonDomesticMember