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Commitments and Contingencies Magnitude of Bankruptcy Claims (Details) (USD $)
 38 Months Ended
Feb. 28, 2014
Commitments and Contingencies Disclosure [Abstract]  
Amount of claims filed with Bankruptcy Court against company $ 4,900,000,000us-gaap_BankruptcyClaimsAmountOfClaimsFiled
Amount of bankruptcy claims settled 3,800,000,000us-gaap_BankruptcyClaimsAmountOfClaimsSettled
Amount of claims disallowed by the Bankruptcy Court 1,100,000,000us-gaap_BankruptcyClaimsAmountOfClaimsExpungedByBankruptcyCourt
Amount of claims withdrawn by creditor $ 15,200,000frp_ClaimsWithdrawnByCreditor