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v2.4.1.9

Long-Term Debt (Schedule of debt) (detail) (USD $) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014
Debt Instrument [Line Items] |  |
Long-term Debt | $ 274,164,000 us-gaap_LongTermDebt | $ 218,516,000 us-gaap_LongTermDebt
Total | 274,164,000 us-gaap_LongTermDebt | 218,516,000 us-gaap_LongTermDebt
Current Portion of Long-Term Debt | 2,530,000 us-gaap_LongTermDebtCurrent | 2,277,000 us-gaap_LongTermDebtCurrent
Long-Term Debt, Less Current Portion | 271,634,000 us-gaap_LongTermDebtNoncurrent | 216,239,000 us-gaap_LongTermDebtNoncurrent
Revolving credit facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 233,000,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | 175,000,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Long-term Debt, Weighted Average Interest Rate | 1.92%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | 1.65%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Debt Instrument, Maturity Date | 2017 |
Total | 233,000,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | 175,000,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Secured Industrial Revenue Development Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 22,630,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondAaMember | 22,630,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondAaMember
Long-term Debt, Weighted Average Interest Rate | 2.97%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondAaMember | 3.23%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondAaMember
Debt Instrument, Maturity Date | 2029 |
Total | 22,630,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondAaMember | 22,630,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondAaMember
Secured Industrial Revenue Development Bond [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 1,398,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondBMember | 1,500,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondBMember
Long-term Debt, Weighted Average Interest Rate | 2.00%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondBMember | 2.00%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondBMember
Debt Instrument, Maturity Date | 2021 |
Total | 1,398,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondBMember | 1,500,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SpecialAssessmentBondBMember
Secured promissory note 1 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 13,769,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtAaMember | 15,313,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtAaMember
Long-term Debt, Weighted Average Interest Rate | 6.98%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtAaMember | 6.98%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtAaMember
Debt Instrument, Maturity Date | 2022 |
Total | 13,769,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtAaMember | 15,313,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtAaMember
Secured promissory note 2 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 3,122,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtBMember | 3,731,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtBMember
Long-term Debt, Weighted Average Interest Rate | 6.35%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtBMember | 6.35%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtBMember
Debt Instrument, Maturity Date | 2020 |
Total | 3,122,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtBMember | 3,731,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = senea_SecuredDebtBMember
Other [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 245,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember | 342,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember
Total | $ 245,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember | $ 342,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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