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Net Income (Loss) Per Share (Details)
 3 Months Ended 12 Months Ended
Jan. 03, 2015
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Reconciliation of basic to diluted weighted average shares of common stock outstanding                      
Basic weighted average shares outstanding 9,344,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,729,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,919,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,029,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,071,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,093,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,100,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,994,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,747,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,084,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,167,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Common stock equivalents:                      
Stock options and restricted shares (in shares)                 150,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 89,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements  
Diluted weighted average shares outstanding 9,560,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,919,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,026,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,108,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,148,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,192,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,188,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,084,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,897,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,173,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,167,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding                      
Anti-dilutive securities excluded from EPS computation (in shares)                 764,748us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,138,411us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,947,992us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Additional anti-dilutive shares                 140,000crai_AdditionalAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShare