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Significant Accounting Policies (narrative) (detail) (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Sales Revenue [Line Items] |  |  |
Net Sales | $ 1,286,350,000 us-gaap_SalesRevenueNet | $ 1,340,208,000 us-gaap_SalesRevenueNet | $ 1,276,297,000 us-gaap_SalesRevenueNet
Advertising Expense | 1,700,000 us-gaap_AdvertisingExpense | 1,500,000 us-gaap_AdvertisingExpense | 1,400,000 us-gaap_AdvertisingExpense
Deferred Financing Cost | 500,000 us-gaap_DeferredFinanceCostsCurrentGross |  |
General Mills Operations LLC [Member] |  |  |
Sales Revenue [Line Items] |  |  |
Net Sales | 138,600,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = senea_GeneralMillsOperationsLlcMember | 150,300,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = senea_GeneralMillsOperationsLlcMember |
UnshippedProduct | $ 60,500,000 senea_Unshippedproduct / us-gaap_MajorCustomersAxis = senea_GeneralMillsOperationsLlcMember |  |
Net Sales Percentage | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = senea_GeneralMillsOperationsLlcMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = senea_GeneralMillsOperationsLlcMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = senea_GeneralMillsOperationsLlcMember
Top Ten Customers [Member] |  |  |
Sales Revenue [Line Items] |  |  |
Net Sales Percentage | 49.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = senea_TopTenCustomersMember | 50.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = senea_TopTenCustomersMember | 47.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = senea_TopTenCustomersMember
Seneca Foods Plants [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | 24 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = senea_SenecaFoodsPlantsMember |  |
Seneca Foods Warehouses [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | 30 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = senea_SenecaFoodsWarehousesMember |  |

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