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FAIR VALUE MEASUREMENTS (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Sep. 30, 2014
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Proceeds from settlement of available-for-sale securities   $ (8,891,000)us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Gain on settlement of available-for-sale securities 489,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains    
Gains recorded in Other Income for settled contracts 151us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet 239us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet  
Minimum [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Foreign currency contracts duration   16 days  
Maximum [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Foreign currency contracts duration   196 days  
Designated as Hedging Instrument [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Contracts Revenue   5,378,000us-gaap_ContractsRevenue
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Contracts Weighted Average Rate Price   $ 1.29gff_ContractsWeightedAverageRatePrice
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Before Tax 134,000gff_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentBeforeTax
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
134,000gff_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentBeforeTax
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 98,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
98,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Gain (loss) recorded in Other Income for settled contracts 41,000us-gaap_ForeignCurrencyTransactionGainLossRealized
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
42,000us-gaap_ForeignCurrencyTransactionGainLossRealized
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Canadian Dollar Forward Contracts [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Derivative asset, notional amount 2,408,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= gff_CanadianDollarForwardContractsMember
2,408,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= gff_CanadianDollarForwardContractsMember
 
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Derivative, average forward exchange rate 1.27us-gaap_DerivativeAverageForwardExchangeRate1
/ us-gaap_DerivativeInstrumentRiskAxis
= gff_CanadianDollarForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
1.27us-gaap_DerivativeAverageForwardExchangeRate1
/ us-gaap_DerivativeInstrumentRiskAxis
= gff_CanadianDollarForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Fair Value, Inputs, Level 2 [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Insurance contracts fair value 3,397,000gff_InsuranceContractsFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
3,397,000gff_InsuranceContractsFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Fair Value, Inputs, Level 2 [Member] | Canadian Dollar Forward Contracts [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments 163,000us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_DerivativeInstrumentRiskAxis
= gff_CanadianDollarForwardContractsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
256,000us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_DerivativeInstrumentRiskAxis
= gff_CanadianDollarForwardContractsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Convertible Notes 2017 [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Debt instrument, interest rate, effective percentage 4.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= gff_ConvertibleNotes2017Member
4.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= gff_ConvertibleNotes2017Member
 
Convertible Notes 2017 [Member] | Fair Value, Inputs, Level 1 [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Convertible debt, fair value disclosures 129,813,000us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_LongtermDebtTypeAxis
= gff_ConvertibleNotes2017Member
129,813,000us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_LongtermDebtTypeAxis
= gff_ConvertibleNotes2017Member
 
Senior Notes 2022 [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Debt instrument, interest rate, effective percentage 5.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= gff_SeniorNotesTwoThousandTwentyTwoMember
5.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= gff_SeniorNotesTwoThousandTwentyTwoMember
5.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= gff_SeniorNotesTwoThousandTwentyTwoMember
Senior Notes 2022 [Member] | Fair Value, Inputs, Level 1 [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Convertible debt, fair value disclosures 594,000,000us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_LongtermDebtTypeAxis
= gff_SeniorNotesTwoThousandTwentyTwoMember
594,000,000us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_LongtermDebtTypeAxis
= gff_SeniorNotesTwoThousandTwentyTwoMember
 
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Trading securities 1,267,000us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,267,000us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
 
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]      
FAIR VALUE MEASUREMENTS (Details) [Line Items]      
Trading securities $ 1,000,000us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
$ 1,000,000us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember