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Inventory (Details) (USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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| Inventory [Abstract] | ||
| Raw materials | $ 12,077,000us-gaap_InventoryRawMaterialsNetOfReserves | $ 10,617,000us-gaap_InventoryRawMaterialsNetOfReserves |
| Finished goods | 59,983,000us-gaap_InventoryFinishedGoodsNetOfReserves | 58,860,000us-gaap_InventoryFinishedGoodsNetOfReserves |
| Inventory | 72,060,000us-gaap_InventoryNet | 69,477,000us-gaap_InventoryNet |
| Finished goods held by distributors | 1,000,000ftnt_InventoryFinishedGoodsNetofReservesHeldbyDistributors | 1,200,000ftnt_InventoryFinishedGoodsNetofReservesHeldbyDistributors |
| Materials at contract manufacturers | $ 4,600,000ftnt_InventoryRawMaterialsNetofReservesatContractManufacturers | $ 4,800,000ftnt_InventoryRawMaterialsNetofReservesatContractManufacturers |
| X | ||||||||||
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- Definition
Inventory, Finished Goods, Net of Reserves, Held by Distributors No definition available.
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| X | ||||||||||
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- Definition
Inventory, Raw Materials, Net of Reserves, at Contract Manufacturers No definition available.
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| X | ||||||||||
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- Definition
Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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