v3.19.2

Fair Value Measurements - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 29, 2019 | Jun. 30, 2018
Restructuring Reserve [Roll Forward] |  |
Change in fair value of contingent consideration | $ 116 | $ 0
Fair Value, Measurements, Recurring |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 1,964 |
Ending balance | 447 |
Level 3 | Fair Value, Measurements, Recurring |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 1,964 |
Change in fair value of contingent consideration | 116 |
Payments of contingent consideration liability | (1,633) |
Ending balance | $ 447 |

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- Definition Change in Fair Value of Contingent Consideration + References No definition available. + Details
Name: | crcm_ChangeinFairValueofContingentConsideration
Namespace Prefix: | crcm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Payment of Contingent Consideration + References No definition available. + Details
Name: | crcm_PaymentofContingentConsideration
Namespace Prefix: | crcm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Restructuring Liability, Fair Value Disclosure + References No definition available. + Details
Name: | crcm_RestructuringLiabilityFairValueDisclosure
Namespace Prefix: | crcm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_RestructuringReserveRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |