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Equity and Redeemable Noncontrolling Interest Equity and Redeemable Noncontrolling Interest - Nonredeemable Noncontrolling Interest, Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 24, 2016 | Sep. 30, 2017 | Sep. 24, 2016
Equity [Abstract] |  |  |  |
Nonredeemable Noncontrolling Interest Activity | $ 0.3 | $ 0.1 | $ 0.8 | $ 0.4

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- Definition Noncontrolling Interest Increase (Decrease), During The Period + References No definition available. + Details
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Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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