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v2.4.1.9

Summary of Significant Accounting Policies (Details 6) (USD $) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Roll forward of the accounts receivable allowance |  |  |
Balance at beginning of period | $ 7,210,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |
Balance at end of period | 4,177,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | 7,210,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |
Foreign Currency Translation |  |  |
Transaction gains and losses recorded in income (loss) before (provision) benefit for income taxes | 300,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 200,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 200,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Billed Revenues |  |  |
Roll forward of the accounts receivable allowance |  |  |
Balance at beginning of period | 7,210,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember | 9,459,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember | 6,548,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember
Increases to reserve | 948,000 us-gaap_ProvisionForDoubtfulAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember | 5,619,000 us-gaap_ProvisionForDoubtfulAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember | 6,854,000 us-gaap_ProvisionForDoubtfulAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember
Amounts written off | (3,993,000)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember | (7,891,000)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember | (3,897,000)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember
Effects of foreign currency translation | 30,000 crai_AllowanceForDoubtfulAccountsReceivableEffectsOfForeignCurrencyTranslation / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember | 25,000 crai_AllowanceForDoubtfulAccountsReceivableEffectsOfForeignCurrencyTranslation / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember | (46,000)crai_AllowanceForDoubtfulAccountsReceivableEffectsOfForeignCurrencyTranslation / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember
Balance at end of period | 4,177,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember | 7,210,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember | 9,459,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember
Unbilled Revenues |  |  |
Roll forward of the accounts receivable allowance |  |  |
Balance at beginning of period | 1,827,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember | 2,921,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember | 2,521,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember
Increases to reserve | 5,242,000 crai_ProvisionForDoubtfulAccountsNotChargedToRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember | 443,000 crai_ProvisionForDoubtfulAccountsNotChargedToRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember | 1,329,000 crai_ProvisionForDoubtfulAccountsNotChargedToRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember
Amounts written off | (4,836,000)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember | (1,538,000)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember | (928,000)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember
Effects of foreign currency translation |  | 1,000 crai_AllowanceForDoubtfulAccountsReceivableEffectsOfForeignCurrencyTranslation / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember | (1,000)crai_AllowanceForDoubtfulAccountsReceivableEffectsOfForeignCurrencyTranslation / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember
Balance at end of period | 2,233,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember | 1,827,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember | 2,921,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember
NeuCo, Inc. | Billed Revenues |  |  |
Roll forward of the accounts receivable allowance |  |  |
Change related to NeuCo | $ (18,000)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ (2,000)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |

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