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Segment Information (narrative) (detail)
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Export [Member]      
Segment Reporting Information [Line Items]      
Net Sales Percentage 9.00%us-gaap_ConcentrationRiskPercentage1
/ senea_SegmentInformationAxis
= senea_ExportMember		 9.20%us-gaap_ConcentrationRiskPercentage1
/ senea_SegmentInformationAxis
= senea_ExportMember		 9.80%us-gaap_ConcentrationRiskPercentage1
/ senea_SegmentInformationAxis
= senea_ExportMember
Green Giant Vegetables [Member]      
Segment Reporting Information [Line Items]      
Net Sales Percentage 13.00%us-gaap_ConcentrationRiskPercentage1
/ senea_SegmentInformationAxis
= senea_GreenGiantVegetablesMember		 13.00%us-gaap_ConcentrationRiskPercentage1
/ senea_SegmentInformationAxis
= senea_GreenGiantVegetablesMember		 13.00%us-gaap_ConcentrationRiskPercentage1
/ senea_SegmentInformationAxis
= senea_GreenGiantVegetablesMember
Fruit And Vegetable Segment [Member]      
Segment Reporting Information [Line Items]      
Assets Percentage 99.00%senea_AssetsPercentage
/ senea_SegmentInformationAxis
= senea_FruitAndVegetableSegmentMember		 99.00%senea_AssetsPercentage
/ senea_SegmentInformationAxis
= senea_FruitAndVegetableSegmentMember		 99.00%senea_AssetsPercentage
/ senea_SegmentInformationAxis
= senea_FruitAndVegetableSegmentMember
Income Loss Fom Continuing Operations Before Income Taxes Percentage 102.00%senea_IncomeLossFomContinuingOperationsBeforeIncomeTaxesPercentage
/ senea_SegmentInformationAxis
= senea_FruitAndVegetableSegmentMember		 93.00%senea_IncomeLossFomContinuingOperationsBeforeIncomeTaxesPercentage
/ senea_SegmentInformationAxis
= senea_FruitAndVegetableSegmentMember		 101.00%senea_IncomeLossFomContinuingOperationsBeforeIncomeTaxesPercentage
/ senea_SegmentInformationAxis
= senea_FruitAndVegetableSegmentMember