XML 47 R36.htm IDEA: XBRL DOCUMENT v3.5.0.2

Revenue Recognition - General (Details)	3 Months Ended	6 Months Ended
	Jul. 02, 2016 item	Jul. 02, 2016 item
Number of broad areas of consulting services	2	2
Consulting Services
Percentage of revenue	100.0	99.5
GNU
Percentage of revenue	0.0	0.5

X

- Definition

Number of area in consulting services.

+ References

No definition available.

+ Details

Name:	crai_NumberOfBroadAreasOfConsultingServices
Namespace Prefix:	crai_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents information pertaining to Percentage of revenue of Consulting services.

+ References

No definition available.

+ Details

Name:	crai_PercentageOfRevenue
Namespace Prefix:	crai_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=crai_ConsultingServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: