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Income Tax (detail)
9 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Income Tax Disclosure [Abstract]    
Effective Income Ta xRate Reconciliation Tax Settlements Other 4.90%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsOther  
Effective Income Tax Rate Continuing Operations 24.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 9.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Continuing Operations Change 15.30%senea_Effectiveincometaxratecontinuingoperationschange  
Effective Income Tax Rate Tax Assets Valuation Allowance 5.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance