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Segment Information - Summary of Unallocated Corporate Overhead (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ 9,674us-gaap_AllocatedShareBasedCompensationExpense	$ 6,659us-gaap_AllocatedShareBasedCompensationExpense
Depreciation expense	17,100us-gaap_Depreciation	15,700us-gaap_Depreciation
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation expense	6,280us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	3,702us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Salary, bonus and fringe	10,696crl_SalariesAndBonus / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	10,267crl_SalariesAndBonus / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Consulting, audit and professional services	3,641crl_AuditTaxAndRelatedExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	3,231crl_AuditTaxAndRelatedExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
IT related expenses	1,864us-gaap_CommunicationsAndInformationTechnology / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	1,577us-gaap_CommunicationsAndInformationTechnology / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Depreciation expense	1,898us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	1,839us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Acquisition related adjustments	(362)crl_TransactionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	3,305crl_TransactionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Other general unallocated corporate expenses	2,137us-gaap_OtherGeneralExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	1,946us-gaap_OtherGeneralExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Unallocated Corporate Overhead	$ 26,154crl_UnallocatedCorporateOverhead / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ 25,867crl_UnallocatedCorporateOverhead / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

X

- Definition

Represents the sum total of audit, tax and related expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	crl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Expenditures for salaries and bonuses for officers and non-officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of direct costs of the business combination or disposition including legal, accounting, and other costs incurred to consummate the business acquisition or disposition.

+ References

No definition available.

+ Details

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Namespace Prefix:	crl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount of unallocated corporate expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	crl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of expense in the period for communications and data processing expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Period Type:	duration

X

- Definition

Amount of general expenses not normally included in Other Operating Costs and Expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.6)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 6

-Article 5

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