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Note 4 - Inventories - Inventories by Category and Impact of Using LIFO Method (Details) - USD ($) $ in Thousands	Jun. 27, 2026	Mar. 31, 2026	Jun. 28, 2025
Finished products	$ 509,010	$ 596,965	$ 587,053
Work in process	101,964	104,202	99,651
Raw materials and supplies	324,344	249,704	275,189
FIFO Inventory Amount	935,318	950,871	961,893
Less: excess of FIFO cost over LIFO cost	(333,911)	(336,958)	(347,458)
Total inventories	$ 601,407	$ 613,913	$ 614,435

X

- Definition

Carrying amount as of the balance sheet date of merchandise or goods held by the company that are readily available for sale on a FIFO basis.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed on a FIFO basis.

+ References

No definition available.

+ Details

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X

- Definition

Carrying amount as of the balance sheet date of merchandise or goods which are partially completed, are generally comprised of raw materials, labor and factory overhead costs, and which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing on a FIFO basis

+ References

No definition available.

+ Details

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Namespace Prefix:	senea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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X

- Definition

Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
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X

- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-3

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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