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Revenue Recognition - Reserves for Variable Consideration and Credit Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Adjustments to reserves for variable consideration and credit risk | $ 2,725 | $ 1,998 | $ 4,158 | $ 3,446
Reimbursable expenses | 12,178 | 12,087 | 25,013 | 23,315
Selling, general and administrative expenses |  |  |  |
Bad debt expense | $ 48 | $ 800 | $ 31 | $ 1,072

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- Definition For an unclassified balance sheet, a valuation allowance for receivables and unbilled services that are due to a company that are expected to be uncollectible. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of reimbursable expenses, which include expenses for travel and other out-of-pocket expenses, outside consultants, and other reimbursable expenses. Revenues include reimbursable expenses. + References No definition available. + Details
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Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | duration

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- Details
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Balance Type: |
Period Type: |