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Note 1 - Unaudited Condensed Consolidated Financial Statements (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Revenue, Net	$ 392,714,000	$ 369,705,000	$ 1,049,209,000	$ 979,566,000
B&G Foods, Inc [Member]
Revenue, Net			$ 112,768,000	$ 95,253,000

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_MajorCustomersAxis=senea_BGFoodsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: