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Note 2 - Revenue Recognition - Summary of Deferred Revenue Activity (Details) - USD ($) $ in Thousands | 6 Months Ended
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Sep. 28, 2024 | Sep. 30, 2023
Beginning balance | $ 8,185 | $ 9,956
Deferral of revenue | 9,994 | 13,871
Recognition of unearned revenue | (8,119) | (9,190)
Ending balance | $ 10,060 | $ 14,637

X
- Definition Amount of addition to the balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References No definition available. + Details
Name: | senea_ContractWithCustomerLiabilityAddition
Namespace Prefix: | senea_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of deduction of contract with customer liability. + References No definition available. + Details
Name: | senea_ContractWithCustomerLiabilityDeduction
Namespace Prefix: | senea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant