| Component: (Network and Table) | |
|---|---|
| Network | 2405407 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION - Composition of Other Assets (Details) (http://www.crl.com/role/SupplementalBalanceSheetInformationCompositionOfOtherAssetsDetails) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0001100682 (http://www.sec.gov/CIK) |
| Supplemental Balance Sheet Information [Abstract] | Period [Axis] | |
|---|---|---|
2016-12-31 | 2015-12-26 | |
Supplemental Balance Sheet Information [Abstract] | ||
Life insurance policies | ||
Venture capital investments | ||
Restricted cash | ||
Other | ||
Other assets | 88,430,000 | 71,643,000 |