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Long-Term Debt and Lines of Credit - Long-Term Debt - Narrative (Detail) (USD $)
9 Months Ended
Feb. 01, 2015
Payment
Apr. 27, 2014
Jan. 26, 2014
Aug. 11, 2008
Debt Instrument [Line Items]        
Long-term debt $ 2,200,000us-gaap_UnsecuredDebt $ 4,400,000us-gaap_UnsecuredDebt $ 4,400,000us-gaap_UnsecuredDebt  
Unsecured senior term notes [Member]        
Debt Instrument [Line Items]        
Issuance of unsecured senior term notes       11,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Fixed interest rate       8.01%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Term of the note agreement 7 years      
Required amount of principal payment installments 2,200,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
     
Date of first required principal payment Aug. 11, 2011      
Required debt payment frequency Annual      
Average term period for remaining principal payments, in years 6 months      
Maturity date Aug. 11, 2015      
Remaining annual payment 2,200,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
     
Number of annual payment remaining 1cfi_DebtInstrumentNumberOfRemainingInstallmentPayments
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
     
Long-term debt, fair value $ 2,300,000us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
$ 4,600,000us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
$ 4,700,000us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember