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Significant Accounting Policies (narrative) (detail) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Sales Revenue [Line Items]
Net Sales	$ 1,276,297,000	$ 1,257,805,000	$ 1,189,585,000
Advertising Expense	1,400,000	3,200,000
Dererred Financing Cost	1,100,000
General Mills Operations LLC [Member]
Sales Revenue [Line Items]
Net Sales	151,200,000	151,000,000
UnshippedProduct	$ 75,700,000
Net Sales Percentage	13.00%	13.00%	16.00%
Top Ten Customers [Member]
Sales Revenue [Line Items]
Net Sales Percentage	47.00%	49.00%	49.00%
Seneca Foods Plants [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	24
Seneca Foods Warehouses [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	30

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 720

-SubTopic 35

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848



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-Publisher AICPA

-Name Statement of Position (SOP)

-Number 93-7

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Gross amount, as of the balance sheet date, of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings in periods within one year, over the life of the long-term debt instruments to which such costs pertain.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

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-Subparagraph (SX 210.5-03.1)

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