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Document and Entity Information - shares	3 Months Ended
	Jul. 01, 2017	Jul. 21, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Document period end date	Jul. 01, 2017
Amendment flag	false
Document Period Focus	Q1
Document Fiscal Year Focus	2018
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
Common Class A [Member]
Class Of Stock [Line Items]
Entity common stock shares outstanding		7,961,417
Trading Symbol	SENEA
Common Class B [Member]
Class Of Stock [Line Items]
Entity common stock shares outstanding		1,884,639
Trading Symbol	SENEB

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