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Note 14 - Restructuring - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2023	Jul. 02, 2022
Balance	$ 117	$ 0
Charge to expense	140	56
Cash payments/write offs	(257)	(56)
Balance	0	0
Employee Severance [Member]
Balance	117	0
Charge to expense	(42)	0
Cash payments/write offs	(75)	0
Balance	0	0
Other Restructuring [Member]
Balance	0	0
Charge to expense	182	56
Cash payments/write offs	(182)	(56)
Balance	$ 0	$ 0

X

- Definition

The net amount of cash payments made (write offs of liability) as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

No definition available.

+ Details

Name:	senea_PaymentsForRestructuringWriteOffsNet
Namespace Prefix:	senea_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan, excluding business exit costs. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

+ References

No definition available.

+ Details

Name:	senea_RestructuringChargesExcludingExitCosts
Namespace Prefix:	senea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482017/420-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2

+ Details

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: