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Document and Entity Information	3 Months Ended
	Jul. 02, 2011	Jul. 29, 2011
Document And Entity Information [Abstract]
Document Type	10-Q
Document period end date	Jul. 02, 2011
Amendment flag	false
Document Period Focus	Q1
Document Fiscal Year Focus	2012
Current fiscal year end date	--03-31
Entity central index key	0000088948
Entity current reporting status	Yes
Entity filer category	Accelerated Filer
Entity registrant name	SENECA FOODS CORP /NY/
Entity voluntary filers	No
Entity well known seasoned issuer	No
Class Of Stock [Line Items]
Entity common stock shares outstanding		11,735,631
Common Class A Member
Class Of Stock [Line Items]
Entity common stock shares outstanding		9,609,809
Common Class B Member
Class Of Stock [Line Items]
Entity common stock shares outstanding		2,125,822

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This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.

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The type of document being provided (such as 10-K, 10-Q, N-1A, etc). The document type should be limited to the same value as the supporting SEC submission type. The acceptable values are as follows: S-1, S-3, S-4, S-11, F-1, F-3, F-4, F-9, F-10, 6-K, 8-K, 10, 10-K, 10-Q, 20-F, 40-F, N-1A, 485BPOS, NCSR, N-Q, and Other.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation 12B
-Number 240
-Section 12b
-Subsection 1

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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