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Note B - Summary of Significant Accounting Policies - Receivables and Contract Liabilities From Contracts With Customers (Details) - USD ($) $ in Thousands | Mar. 29, 2020 | Mar. 31, 2019
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Deferred franchise fees (a) | [1] | $ 1,917 | $ 3,005
[1] | Deferred franchise fees of $230 and $1,687 are included in Deferred franchise fees - current and long term as of March 29, 2020, respectively and $318 and $2,687 as of March 31, 2019, respectively.

X
- Definition Amount of obligation to transfer good or service to customer for which consideration is receivable. Excludes the amount of cash received. + References No definition available. + Details
Name: | nath_ContractWithCustomerLiabilityExcludingCashReceived
Namespace Prefix: | nath_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant