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Summary of Significant Accounting Policies - Summary of Inventory Values by Product Group (Detail) (USD $) | Mar. 31, 2015 | Mar. 31, 2014
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Inventory [Line Items] |  |
Inventory, Net | $ 40,850,666 us-gaap_InventoryNet | $ 35,288,559 us-gaap_InventoryNet
Prime Coil Inventory |  |
Inventory [Line Items] |  |
Raw Materials | 8,419,340 us-gaap_InventoryRawMaterials / us-gaap_ProductOrServiceAxis = frd_PrimeCoilMember | 7,685,177 us-gaap_InventoryRawMaterials / us-gaap_ProductOrServiceAxis = frd_PrimeCoilMember
Non-Standard Coil Inventory |  |
Inventory [Line Items] |  |
Raw Materials | 1,804,635 us-gaap_InventoryRawMaterials / us-gaap_ProductOrServiceAxis = frd_NonStandardCoilMember | 2,572,787 us-gaap_InventoryRawMaterials / us-gaap_ProductOrServiceAxis = frd_NonStandardCoilMember
Tubular |  |
Inventory [Line Items] |  |
Raw Materials | 1,888,849 us-gaap_InventoryRawMaterials / us-gaap_ProductOrServiceAxis = frd_TubularMember | 463,254 us-gaap_InventoryRawMaterials / us-gaap_ProductOrServiceAxis = frd_TubularMember
Finished Goods | $ 28,737,842 us-gaap_InventoryFinishedGoods / us-gaap_ProductOrServiceAxis = frd_TubularMember | $ 24,567,341 us-gaap_InventoryFinishedGoods / us-gaap_ProductOrServiceAxis = frd_TubularMember

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