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Inventory (table) (detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
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Inventory Disclosure [Abstract] |  |  |
Finished products | $ 414,154 senea_Inventoryfinishedgoodsfifo | $ 418,368 senea_Inventoryfinishedgoodsfifo | $ 445,278 senea_Inventoryfinishedgoodsfifo
In process | 22,651 senea_Inventoryworkinprocessfifo | 16,056 senea_Inventoryworkinprocessfifo | 18,107 senea_Inventoryworkinprocessfifo
Raw material and supplies | 199,674 senea_Inventoryrawmaterialsandsuppliesfifo | 170,210 senea_Inventoryrawmaterialsandsuppliesfifo | 149,359 senea_Inventoryrawmaterialsandsuppliesfifo
Total | 636,479 us-gaap_FIFOInventoryAmount | 604,634 us-gaap_FIFOInventoryAmount | 612,744 us-gaap_FIFOInventoryAmount
Inventory, LIFO Reserve | 164,067 us-gaap_InventoryLIFOReserve | 153,384 us-gaap_InventoryLIFOReserve | 133,014 us-gaap_InventoryLIFOReserve
Total Inventories | $ 472,412 us-gaap_InventoryNet | $ 451,250 us-gaap_InventoryNet | $ 479,730 us-gaap_InventoryNet

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- Definition Carrying amount as of the balance sheet date of merchandise or goods held by the company that are readily available for sale on a FIFO basis + References No definition available. + Details
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- Definition Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed on a FIFO basis + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of merchandise or goods which are partially completed, are generally comprised of raw materials, labor and factory overhead costs, and which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing on a FIFO basis + References No definition available. + Details
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- Definition The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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- Definition Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph c -Article 5 + Details
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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