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Profit Sharing Plan - Additional Information (Detail) (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |
Service period of employees to fully vest in plan | 6 years |
Defined Contribution Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Maximum annual contribution percentage to defined contribution plan for eligible employees | 15.00%frd_MaximumAnnualContributionPercentageToDefinedContributionPlanForEligibleEmployeeCompensation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = frd_DefinedContributionRetirementPlanMember |
Expenses related to defined contribution plans | $ 190,000 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = frd_DefinedContributionRetirementPlanMember | $ 206,000 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = frd_DefinedContributionRetirementPlanMember
Defined Contribution 401 K Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Company contributions to defined contribution plan | $ 44,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = frd_DefinedContribution401KPlanMember | $ 47,500 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = frd_DefinedContribution401KPlanMember
Defined contribution plan service period for eligibility | 1 year |

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- Definition Maximum Annual Contribution Percentage To Defined Contribution Plan For Eligible Employee Compensation + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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