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Note 5 - Inventories - Inventories by Category and Impact of Using LIFO Method (Details) - USD ($)	Jun. 27, 2020	Mar. 31, 2020	Jun. 29, 2019
Finished products	$ 330,071,000	$ 351,251,000	$ 405,372,000
In process	29,875,000	31,173,000	33,568,000
Raw materials and supplies	206,024,000	173,474,000	219,075,000
Total	565,970,000	555,898,000	658,015,000
Less excess of FIFO cost over LIFO cost	142,126,000	144,267,000	164,517,000
Inventories	$ 423,844,000	$ 411,631,000	$ 493,498,000

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

Name:	senea_InventoryFinishedGoodsFIFO
Namespace Prefix:	senea_
Data Type:	xbrli:monetaryItemType
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

Name:	senea_InventoryRawMaterialSandSuppliesFIFO
Namespace Prefix:	senea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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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

Name:	senea_InventoryWorkInProcessFIFO
Namespace Prefix:	senea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(c))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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