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Segment Information (classes of similar products/services) (table) (detail) (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [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
General Mills Operations LLC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Sales | 161,993,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_GeneralMillsOperationsLlcMember | 177,881,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_GeneralMillsOperationsLlcMember | 165,684,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_GeneralMillsOperationsLlcMember
Canned Vegetables [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Sales | 754,556,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_CannedVegetablesMember | 753,318,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_CannedVegetablesMember | 746,892,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_CannedVegetablesMember
Frozen [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Sales | 94,648,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_FrozenMember | 107,109,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_FrozenMember | 84,935,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_FrozenMember
Fruit [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Sales | 234,918,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_FruitMember | 264,549,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_FruitMember | 245,596,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_FruitMember
Snack [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Sales | 11,667,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_SnackMember | 11,496,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_SnackMember | 11,357,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_SnackMember
Other Products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Sales | $ 28,568,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_OtherProductsMember | $ 25,855,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_OtherProductsMember | $ 21,833,000 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = senea_OtherProductsMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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