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v2.4.1.9

Other Operating Income and Expenses (detail) (USD $) | 12 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |
Loss On Sale Of Other Assets |  |  | $ 300,000 senea_LossOnSaleOfOtherAssets
Environmental Remediation Expense | 300,000 us-gaap_EnvironmentalRemediationExpense |  |
Gain on sale of other assets | 100,000 senea_GainOnSaleOfOtherAssets | 200,000 senea_GainOnSaleOfOtherAssets |
Midwest Plant Member [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain from plant closing | 5,000,000 senea_Gainfromplantclosing / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = senea_MidwestplantMember |  |
Sunnyside, WA [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain (Loss) on Disposition of Assets |  | 500,000 us-gaap_GainLossOnDispositionOfAssets / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = senea_SunnysideWaMember |
Gain on Purchase of Business |  | 100,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = senea_SunnysideWaMember | 2,000,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = senea_SunnysideWaMember
Allens [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
OtherNonrecurringIncome |  | 2,900,000 us-gaap_OtherNonrecurringIncome / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = senea_AllensMember |
Aircraft [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain on sale of other assets |  | 700,000 senea_GainOnSaleOfOtherAssets / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = senea_AircraftMember |
Cambria,Wi [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain on sale of other assets |  |  | $ 300,000 senea_GainOnSaleOfOtherAssets / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = senea_CambriawiMember

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- Definition The gain included in results of operations resulting from the sale or disposal of other assets. + References No definition available. + Details
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- Definition The loss included in results of operations resulting from the sale or disposal of other assets. + References No definition available. + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6571-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6527-128477 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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