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Note 8 - Plant Restructuring - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Dec. 30, 2017	Dec. 31, 2016
Balance			$ 5,115			$ 8,872	$ 5,115	$ 8,872
Quarter charge (credit)	$ 101	$ (25)	81	$ 1,316	$ 277	1,185	157	2,778
Cash payments/write offs							(4,272)	(4,904)
Balance	1,000			6,746			1,000	6,746
Employee Severance [Member]
Balance			37				37
Quarter charge (credit)	98		36	1,261	112	127
Cash payments/write offs							(73)	(1,480)
Balance	98			20			98	20
Impairment of Long-Lived Assets [Member]
Balance			4,773			4,975	4,773	4,975
Quarter charge (credit)		8	9	62	(286)	(6)
Cash payments/write offs							(3,888)	164
Balance	902			4,909			902	4,909
Other Restructuring [Member]
Balance			305			3,897	305	3,897
Quarter charge (credit)	3	$ (33)	$ 36	(7)	$ 451	$ 1,064
Cash payments/write offs							(311)	(3,588)
Balance				$ 1,817				$ 1,817

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

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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 expenses related to a discontinued operation or an asset retirement obligation.

+ References

No definition available.

+ Details

Name:	senea_RestructuringChargesCreditsNet
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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=senea_ImpairmentOfLongLivedAssetsMember
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: