XML 48 R28.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Investments in Limited Partnerships and Marketable Securities (Tables) | 12 Months Ended
--- | ---
Dec. 26, 2015
Marketable Securities and Equity-Method Affiliates [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | The following is a summary of the Company’s marketable securities, all of which are classified as available-for-sale:
| December 26, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (in thousands)
Mutual fund | $ | 4,650 |  |  | $ | — |  |  | $ | (141 | ) |  | $ | 4,509 |
Total | $ | 4,650 |  |  | $ | — |  |  | $ | (141 | ) |  | $ | 4,509 |

X
- Definition Marketable Securities and Equity-Method Affiliates [Abstract] + References No definition available. + Details
Name: | crl_MarketableSecuritiesAndEquityMethodAffiliatesAbstract
Namespace Prefix: | crl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration