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Profit Sharing Plan - Additional Information (Detail) (USD $)
 12 Months Ended
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 $ 190,000us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= frd_DefinedContributionRetirementPlanMember		 $ 206,000us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= frd_DefinedContributionRetirementPlanMember
Defined Contribution 401 K Plan    
Defined Benefit Plan Disclosure [Line Items]    
Company contributions to defined contribution plan $ 44,000us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= frd_DefinedContribution401KPlanMember		 $ 47,500us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= frd_DefinedContribution401KPlanMember
Defined contribution plan service period for eligibility 1 year