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Note D - Revenues - Contract Liabilities From Contracts With Customers (Details) - USD ($) $ in Thousands | Sep. 26, 2021 | Mar. 28, 2021
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Receivables, which are included in “Accounts and other receivables, net” (a) | [1] | $ 250 | $ 0
Deferred franchise fees (b) | [2] | $ 2,119 | $ 1,773
[1] | Includes receivables related to "franchise fees and royalties"
[2] | Deferred franchise fees of $351 and $1,768 as of September 26, 2021 and $237 and $1,536 as of March 28, 2021 are included in Deferred franchise fees – current and long term, respectively.

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- 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

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130533-203044 + Details
Name: | us-gaap_ContractWithCustomerAssetNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant