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Income Tax (Effective Income Tax Rate) (detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Income Tax Disclosure [Abstract]      
Current Federal Tax Expense (Benefit) $ 4,380us-gaap_CurrentFederalTaxExpenseBenefit $ 7,238us-gaap_CurrentFederalTaxExpenseBenefit $ 21,356us-gaap_CurrentFederalTaxExpenseBenefit
Current State and Local Tax Expense (Benefit) 453us-gaap_CurrentStateAndLocalTaxExpenseBenefit 123us-gaap_CurrentStateAndLocalTaxExpenseBenefit 3,629us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total 4,833us-gaap_CurrentIncomeTaxExpenseBenefit 7,361us-gaap_CurrentIncomeTaxExpenseBenefit 24,985us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Federal Income Tax Expense (Benefit) (925)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (3,231)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (2,770)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred State and Local Income Tax Expense (Benefit) 313us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (567)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (180)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total (612)us-gaap_DeferredIncomeTaxExpenseBenefit (3,798)us-gaap_DeferredIncomeTaxExpenseBenefit (2,950)us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit), Total $ 4,221us-gaap_IncomeTaxExpenseBenefit $ 3,563us-gaap_IncomeTaxExpenseBenefit $ 22,035us-gaap_IncomeTaxExpenseBenefit
Computed 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes (net of federal tax benefit) 2.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Federal tax credits (2.40%)senea_Effectiveincometaxratereconciliationtaxcreditsfederal (3.60%)senea_Effectiveincometaxratereconciliationtaxcreditsfederal (0.20%)senea_Effectiveincometaxratereconciliationtaxcreditsfederal
State tax credits (8.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther
Manufacturer's deduction (5.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (4.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (3.40%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
Addition to (reversal of) uncertain tax positions (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
State VDA/Nexus Changes 0.00%senea_Effectiveincometaxratereconciliationchangeinstatevoluntarydisclosureandnexus (1.70%)senea_Effectiveincometaxratereconciliationchangeinstatevoluntarydisclosureandnexus  
Other permanent differences not (taxable) deductible 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Change in valuation allowance 9.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Effective Income Tax Rate Reconciliation Pension Contribution 0.00%senea_EffectiveIncomeTaxRateReconciliationPensionContribution 0.40%senea_EffectiveIncomeTaxRateReconciliationPensionContribution  
Other (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (4.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments  
Effective income tax rate 29.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 20.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 34.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations