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Plant Restructuring (table) (detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 27, 2014 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 31, 2013 | Dec. 29, 2012 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 1,501,000 us-gaap_RestructuringReserve |  |  | $ 10,000 us-gaap_RestructuringReserve | $ 1,501,000 us-gaap_RestructuringReserve | $ 37,000 us-gaap_RestructuringReserve
Plant Restructuring | 487,000 us-gaap_RestructuringCharges | 889,000 us-gaap_RestructuringCharges | 347,000 us-gaap_RestructuringCharges | 154,000 us-gaap_RestructuringCharges | 987,000 us-gaap_RestructuringCharges | 2,510,000 us-gaap_RestructuringCharges | 1,376,000 us-gaap_RestructuringCharges | 501,000 us-gaap_RestructuringCharges | 3,497,000 us-gaap_RestructuringCharges
Cash payment/write offs |  |  |  |  |  |  | (137,000)us-gaap_PaymentsForRestructuring | (1,992,000)us-gaap_PaymentsForRestructuring | (2,033,000)us-gaap_PaymentsForRestructuring
Balance | 1,249,000 us-gaap_RestructuringReserve |  |  |  | 1,501,000 us-gaap_RestructuringReserve |  | 1,249,000 us-gaap_RestructuringReserve | 10,000 us-gaap_RestructuringReserve | 1,501,000 us-gaap_RestructuringReserve
Employee Severance [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  | 20,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |  | 10,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 20,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 37,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Plant Restructuring | 309,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 533,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |  |  |  |  |  |
Cash payment/write offs |  |  |  |  |  |  | (137,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | (10,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | (17,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Balance | 715,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |  |  | 20,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  | 715,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 10,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 20,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Long Lived Asset Charges [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  | 1,174,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember | 1,174,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember
Plant Restructuring | (52,000)us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember | 316,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember | 341,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember |  | 109,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember | 1,107,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember |  |  |
Cash payment/write offs |  |  |  |  |  |  | 0 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember | (1,515,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember | (42,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember
Balance | 264,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember |  |  |  | 1,174,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember |  | 264,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember | 1,174,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = senea_LongLivedAssetChargesMember
Other Restructuring [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  | 307,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 307,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember
Plant Restructuring | 230,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 40,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 6,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 154,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 878,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 1,403,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |  |  |
Cash payment/write offs |  |  |  |  |  |  | 0 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | (467,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | (1,974,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember
Balance | $ 270,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |  |  |  | $ 307,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |  | $ 270,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | $ 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | $ 307,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember

X
- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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