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Acquisition (narrative) (detail) (USD $)
Apr. 01, 2014
Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract]  
Equity Method Investments $ 16,200,000us-gaap_EquityMethodInvestments
Equity Method Ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity Method Right to Acquire 50.00%senea_Equiityinvestmentrighttoacquirepercentage