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Note 9 - Plant Restructuring - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Sep. 30, 2017	Jul. 01, 2017
Balance				$ 342
Quarter charge (credit)	$ 841	110	$ (33)	72
Cash payments/write offs	(173)		(381)
Balance	778
Employee Severance [Member]
Balance				37
Quarter charge (credit)	841	110		36
Cash payments/write offs	(173)		(73)
Balance	778
Other Restructuring [Member]
Balance				305
Quarter charge (credit)			(33)	$ 36
Cash payments/write offs			(308)
Balance

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 (credits against expense) associated with exit or disposal activities pursuant to an authorized plan. Excludes impairment charges.

+ References

No definition available.

+ Details

Name:	senea_RestructuringChargesCreditsExcludingImpairmentCharge
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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ 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: