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Significant Accounting Policies (narrative) (detail) (USD $) | 12 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Sales Revenue [Line Items] |  |  |
Net Sales | $ 1,340,208,000 | $ 1,276,297,000 | $ 1,257,805,000
Advertising Expense | 1,500,000 | 1,400,000 |
Dererred Financing Cost | 800,000 |  |
General Mills Operations LLC [Member] |  |  |
Sales Revenue [Line Items] |  |  |
Net Sales | 150,300,000 | 151,200,000 |
UnshippedProduct | $ 71,900,000 |  |
Net Sales Percentage | 13.00% |  |
Top Ten Customers [Member] |  |  |
Sales Revenue [Line Items] |  |  |
Net Sales Percentage | 50.00% | 47.00% | 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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- Definition 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. + References 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition 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. + References 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-Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + Details
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