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Assets Held For Sale (detail) (Modesto, CA Plant) | Mar. 31, 2015
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Modesto, CA Plant |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |
Assets Percentage | 1.00%senea_AssetsPercentage / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = senea_ModestocaliforniaplantMember

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- Definition Percentage of total assets + References No definition available. + Details
Name: | senea_AssetsPercentage
Namespace Prefix: | senea_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration