XML 108 R90.htm IDEA: XBRL DOCUMENT
v3.6.0.2

FAIR VALUE (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 26, 2015
Fair Value Disclosures [Abstract] |  |
Transfers between fair value levels | $ 0 | $ 0

X
- Definition Transfers between fair value levels + References No definition available. + Details
Name: | crl_Transfersbetweenfairvaluelevels
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration