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Note B - Summary of Significant Accounting Policies - The Company's Sales (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Sales $ 75,520us-gaap_SalesRevenueGoodsNet $ 65,521us-gaap_SalesRevenueGoodsNet $ 56,656us-gaap_SalesRevenueGoodsNet
Branded Product Sales [Member]      
Sales 58,948us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= nath_BrandedProductSalesMember		 51,877us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= nath_BrandedProductSalesMember		 43,214us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= nath_BrandedProductSalesMember
Company Operated Restaurants [Member]      
Sales 15,874us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= nath_CompanyOperatedRestaurantsMember		 13,231us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= nath_CompanyOperatedRestaurantsMember		 13,403us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= nath_CompanyOperatedRestaurantsMember
Other Products [Member]      
Sales $ 698us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= nath_OtherProductsMember		 $ 413us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= nath_OtherProductsMember		 $ 39us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= nath_OtherProductsMember