XML 91 R75.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Assets Held For Sale (detail) $ in Thousands | Mar. 31, 2016 USD ($)
--- | ---
Assets Held For Sale Not Part Of Disposal Group Current [Abstract] |
Assets Held For Sale | $ 5,025
Northwest Processing Facility [Member] |
Assets Held For Sale Not Part Of Disposal Group Current [Abstract] |
Assets Held For Sale | $ 5,000
Assets Percentage | 0.60%

X
- 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
- References No definition available. + Details
Name: | us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of other assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6390208&loc=d3e400-110220 + Details
Name: | us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrentOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=senea_NorthwestProcessingFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |