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Subsequent Event (detail) | Apr. 01, 2017 | Mar. 31, 2017
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Subsequent Event [Abstract] |  |
Business Combination Step Acquisition Equity Interest In Acquiree Percentage |  | 50.00%
Equity Method Right to Acquire | 50.00% |

X
- Definition The percentage of the investee that the investor has the right to acquire in the furture. + References No definition available. + Details
Name: | senea_Equiityinvestmentrighttoacquirepercentage
Namespace Prefix: | senea_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
Name: | us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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