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v2.4.1.9

Income Tax (narrative) (detail) (USD $) | 12 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Effective income tax rate | 29.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 20.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 34.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Continuing Operations Change | 9.40%senea_EffectiveIncomeTaxRateContinuingOperationsChange |  |
Other Amounts Related To Income Taxes |  | $ 1,900,000 senea_OtherAmountsRelatedToIncomeTaxes |
Unrecognized Tax Benefits, Period Increase (Decrease) | 100,000 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 100,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 200,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |
Tax Credit Carryforward [Line Items] |  |  |
Valuation allowance - non-current | 1,787,000 us-gaap_DeferredTaxAssetsValuationAllowance | 390,000 us-gaap_DeferredTaxAssetsValuationAllowance |
Deferred Income Tax Asset, Net | 6,997,000 us-gaap_DeferredTaxAssetsNetCurrent | 8,412,000 us-gaap_DeferredTaxAssetsNetCurrent |
Deferred Tax Assets, Net, Noncurrent | 14,829,000 us-gaap_DeferredTaxAssetsNetNoncurrent |  |
Deferred Income Taxes, Net |  | 339,000 us-gaap_DeferredIncomeTaxLiabilities |
New York [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforward, Valuation Allowance | 800,000 us-gaap_TaxCreditCarryforwardValuationAllowance / us-gaap_TaxCreditCarryforwardAxis = senea_NewYorkMember |  |
Expiration Date | Dec. 31, 2030 |  |
California [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforward, Valuation Allowance | 1,300,000 us-gaap_TaxCreditCarryforwardValuationAllowance / us-gaap_TaxCreditCarryforwardAxis = senea_CaliforniaMember |  |
Expiration Date | Dec. 31, 2025 |  |
Wisconsin [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforward, Valuation Allowance | $ 1,800,000 us-gaap_TaxCreditCarryforwardValuationAllowance / us-gaap_TaxCreditCarryforwardAxis = senea_WisconsinMember |  |
Expiration Date | Dec. 31, 2030 |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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