XML 40 R29.htm IDEA: XBRL DOCUMENT v3.5.0.2

Description of Business (Details)	6 Months Ended
	Jul. 02, 2016 item
Description of Business
Number of broad areas of services	2

X

- References

No definition available.

+ Details

Name:	crai_DescriptionOfBusinessDisclosureAbstract
Namespace Prefix:	crai_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the area of services broadly offered by the entity.

+ References

No definition available.

+ Details

Name:	crai_NumberOfAreasOfServices
Namespace Prefix:	crai_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration