Basis Of Presentation Policies	9 Months Ended
Dec. 26, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Presentation	1. Unaudited Condensed Consolidated Financial Statements In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments, which are normal and recurring in nature, necessary to present fairly the financial position of Seneca Foods Corporation (the “Company”) as of December 26, 2015 and results of its operations and its cash flows for the interim periods presented. All significant intercompany transactions and accounts have been eliminated in consolidation. The March 31, 2015 balance sheet was derived from the audited consolidated financial statements. The results of operations for the three and nine month periods ended December 26, 2015 are not necessarily indicative of the results to be expected for the full year. The accounting policies followed by the Company are set forth in Note 1 to the Company's Consolidated Financial Statements in the Company’s 2015 Annual Report on Form 10-K. In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes which requires that all deferred tax liabilities and assets of the same tax jurisdiction or a tax filing group, as well as any related valuation allowance, be offset and be presented as a single noncurrent amount in a classified balance sheet. The Company adopted this standard during the third quarter of fiscal 2016 on a prospective basis. Prior periods were not retrospectively adjusted. Other footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted. These unaudited condensed consolidated financial statements should be read in conjunction with the financial statements and notes included in the Company's 2015 Annual Report on Form 10-K. All references to years are fiscal years ended or ending March 31 unless otherwise indicated. Certain percentage tables may not foot due to rounding. Reclassifications—Certain previously reported amounts have been reclassified to conform to the current period classification. On October 30, 2015, the Company, B&G Foods North America (“B&G”), General Mills, Inc. and GMOL entered into a Relationship Transfer Agreement. Pursuant to the terms of the Relationship Transfer Agreement (i) the Company has consented to the assignment by GMOL of the Second Amended and Restated Alliance Agreement (“Alliance Agreement”) and certain related agreements to B&G in connection with the sale by GMOL of its Green Giant and Le Sueur businesses to B&G, (ii) effective upon such assignment, each of the Company and General Mills have released the other party from any future obligations under the Alliance Agreement and certain related agreements; (iii) effective upon such assignment, the Company and B&G have agreed to amend certain terms of the Alliance Agreement; (iv) the Company and B&G have agreed to cooperate and negotiate in good faith to enter into new agreements to replace or supplement the Alliance Agreement and certain related agreements as soon as practicable and (v) GMOL has agreed to pay Seneca for this assignment $24,275,000 at the closing of the sale of GMOL’s Green Giant and Le Sueur business to B&G. The effective date of the assignment was November 2, 2015. During the nine months ended December 26, 2015, the Company sold $126,050,000 of Green Giant finished goods inventory to General Mills Operations, LLC (“GMOL”) for cash, on a bill and hold basis, as compared to $138,641,000 for the nine months ended December 27, 2014. Under the terms of the bill and hold agreement, title to the specified inventory transferred to GMOL. The Company believes it has met the criteria required for bill and hold treatment.

1. Unaudited Condensed Consolidated Financial Statements

In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments, which are normal and recurring in nature, necessary to present fairly the financial position of Seneca Foods Corporation (the “Company”) as of December 26, 2015 and results of its operations and its cash flows for the interim periods presented. All significant intercompany transactions and accounts have been eliminated in consolidation. The March 31, 2015 balance sheet was derived from the audited consolidated financial statements.

The results of operations for the three and nine month periods ended December 26, 2015 are not necessarily indicative of the results to be expected for the full year.

The accounting policies followed by the Company are set forth in Note 1 to the Company's Consolidated Financial Statements in the Company’s 2015 Annual Report on Form 10-K.

In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes which requires that all deferred tax liabilities and assets of the same tax jurisdiction or a tax filing group, as well as any related valuation allowance, be offset and be presented as a single noncurrent amount in a classified balance sheet. The Company adopted this standard during the third quarter of fiscal 2016 on a prospective basis. Prior periods were not retrospectively adjusted.

Other footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted. These unaudited condensed consolidated financial statements should be read in conjunction with the financial statements and notes included in the Company's 2015 Annual Report on Form 10-K.

All references to years are fiscal years ended or ending March 31 unless otherwise indicated. Certain percentage tables may not foot due to rounding.

Reclassifications—Certain previously reported amounts have been reclassified to conform to the current period classification.

On October 30, 2015, the Company, B&G Foods North America (“B&G”), General Mills, Inc. and GMOL entered into a Relationship Transfer Agreement. Pursuant to the terms of the Relationship Transfer Agreement (i) the Company has consented to the assignment by GMOL of the Second Amended and Restated Alliance Agreement (“Alliance Agreement”) and certain related agreements to B&G in connection with the sale by GMOL of its Green Giant and Le Sueur businesses to B&G, (ii) effective upon such assignment, each of the Company and General Mills have released the other party from any future obligations under the Alliance Agreement and certain related agreements; (iii) effective upon such assignment, the Company and B&G have agreed to amend certain terms of the Alliance Agreement; (iv) the Company and B&G have agreed to cooperate and negotiate in good faith to enter into new agreements to replace or supplement the Alliance Agreement and certain related agreements as soon as practicable and (v) GMOL has agreed to pay Seneca for this assignment $24,275,000 at the closing of the sale of GMOL’s Green Giant and Le Sueur business to B&G. The effective date of the assignment was November 2, 2015.

During the nine months ended December 26, 2015, the Company sold $126,050,000 of Green Giant finished goods inventory to General Mills Operations, LLC (“GMOL”) for cash, on a bill and hold basis, as compared to $138,641,000 for the nine months ended December 27, 2014. Under the terms of the bill and hold agreement, title to the specified inventory transferred to GMOL. The Company believes it has met the criteria required for bill and hold treatment.