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Significant Accounting Policies (narrative) (detail) $ in Thousands | 12 Months Ended
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Mar. 31, 2017 USD ($) Number | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Sales Revenue [Line Items] |  |  |
Net Sales | $ 1,245,681 | $ 1,275,360 | $ 1,286,350
Advertising Expense | 2,100 | 2,000 | $ 1,700
Deferred Financing Cost, Current | 900 |  |
Deferred Finance Costs, Noncurrent | $ 200 |  |
Seneca Foods Plants [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | Number | 27 |  |
Seneca Foods Warehouses [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | Number | 31 |  |
General Mills Operations LLC [Member] |  |  |
Sales Revenue [Line Items] |  |  |
UnshippedProduct | $ 43,300 |  |
General Mills Operations LLC [Member] | Sales Revenue Net [Member] |  |  |
Sales Revenue [Line Items] |  |  |
Net Sales | $ 95,800 | $ 126,100 |
Net Sales Percentage | 6.00% | 11.00% | 13.00%
Top Ten Customers [Member] | Sales Revenue Net [Member] |  |  |
Sales Revenue [Line Items] |  |  |
Net Sales Percentage | 42.00% | 48.00% | 49.00%
Shipping and Handling Cost [Member] | Sales Revenue Net [Member] |  |  |
Sales Revenue [Line Items] |  |  |
Net Sales | $ 38,000 | $ 38,300 | $ 38,800

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