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Segment Information (table) (detail) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net Sales	$ 1,286,350,000us-gaap_SalesRevenueNet	$ 1,340,208,000us-gaap_SalesRevenueNet	$ 1,276,297,000us-gaap_SalesRevenueNet
Operating Income	19,148,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	23,604,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	70,934,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Interest Expense, Net	5,656,000us-gaap_InterestExpense	6,262,000us-gaap_InterestExpense	7,486,000us-gaap_InterestExpense
Income Taxes Expense (Benefit)	4,221,000us-gaap_IncomeTaxExpenseBenefit	3,563,000us-gaap_IncomeTaxExpenseBenefit	22,035,000us-gaap_IncomeTaxExpenseBenefit
Total Assets	805,694,000us-gaap_Assets	768,853,000us-gaap_Assets	798,456,000us-gaap_Assets
Additions to Property, Plant and Equipment	(26,213,000)us-gaap_PropertyPlantAndEquipmentAdditions	(17,027,000)us-gaap_PropertyPlantAndEquipmentAdditions	(17,047,000)us-gaap_PropertyPlantAndEquipmentAdditions
Depreciation & Amortization	21,834,000us-gaap_DepreciationAndAmortization	23,281,000us-gaap_DepreciationAndAmortization	23,251,000us-gaap_DepreciationAndAmortization
Fruit And Vegetable [Member]
Segment Reporting Information [Line Items]
Net Sales	1,246,115,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	1,302,857,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	1,243,107,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember
Operating Income	17,659,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	21,063,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	70,313,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember
Interest Expense, Net	5,572,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	6,113,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	7,319,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember
Income Taxes Expense (Benefit)	3,775,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	3,118,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	21,831,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember
Total Assets	797,886,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	761,078,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	791,643,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember
Additions to Property, Plant and Equipment	22,177,000us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	17,339,000us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	16,125,000us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember
Depreciation & Amortization	20,445,000us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	21,842,000us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember	22,146,000us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = senea_FruitAndVegetableMember
Snack [Member]
Segment Reporting Information [Line Items]
Net Sales	11,667,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	11,496,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	11,357,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember
Operating Income	779,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	872,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	174,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember
Interest Expense, Net	12,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	27,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	35,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember
Income Taxes Expense (Benefit)	225,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	189,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	53,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember
Total Assets	3,235,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	3,770,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	4,038,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember
Additions to Property, Plant and Equipment	157,000us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember
Depreciation & Amortization	367,000us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	394,000us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember	404,000us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = senea_SnackMember
Other Products [Member]
Segment Reporting Information [Line Items]
Net Sales	28,568,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	25,855,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	21,833,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember
Operating Income	710,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	1,669,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	447,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember
Interest Expense, Net	72,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	122,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	132,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember
Income Taxes Expense (Benefit)	221,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	256,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	151,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember
Total Assets	4,573,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	4,005,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	2,775,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember
Additions to Property, Plant and Equipment	1,400,000us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	2,109,000us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	246,000us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember
Depreciation & Amortization	$ 1,022,000us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	$ 1,045,000us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember	$ 701,000us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = senea_OtherProductsMember

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