XML 23 R57.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Equity - Treasury Shares (Details) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 27, 2014 | Dec. 28, 2013 | Dec. 25, 2010 | Mar. 28, 2015 | Mar. 29, 2014 | Jul. 31, 2010
Treasury Shares |  |  |  |  |  |
Authorized stock repurchase amount |  |  |  | $ 1,150,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  | $ 500,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Authorized increase, stock repurchase | 150,000,000 crl_StockRepurchaseProgramAuthorizedAmountIncreaseDecrease | 250,000,000 crl_StockRepurchaseProgramAuthorizedAmountIncreaseDecrease | 250,000,000 crl_StockRepurchaseProgramAuthorizedAmountIncreaseDecrease |  |  |
Remaining authorized repurchase amount |  |  |  | 128,500,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |
Open market repurchases [Member] |  |  |  |  |  |
Treasury Shares |  |  |  |  |  |
Number of shares of common stock repurchased (in shares) |  |  |  | 0.7 us-gaap_TreasuryStockSharesAcquired / crl_StockRepurchasesAxis = crl_OpenMarketRepurchasesMember | 0.2 us-gaap_TreasuryStockSharesAcquired / crl_StockRepurchasesAxis = crl_OpenMarketRepurchasesMember |
Total cost of repurchase of treasury shares |  |  |  | 50,000,000 crl_CostOfRepurchaseOfTreasuryShares / crl_StockRepurchasesAxis = crl_OpenMarketRepurchasesMember | 9,800,000 crl_CostOfRepurchaseOfTreasuryShares / crl_StockRepurchasesAxis = crl_OpenMarketRepurchasesMember |
2007 Incentive Plan [Member] |  |  |  |  |  |
Treasury Shares |  |  |  |  |  |
Number of shares of common stock repurchased (in shares) |  |  |  | 0.1 us-gaap_TreasuryStockSharesAcquired / crl_StockRepurchasesAxis = crl_TwoThousandSevenIncentivePlanMember | 0.1 us-gaap_TreasuryStockSharesAcquired / crl_StockRepurchasesAxis = crl_TwoThousandSevenIncentivePlanMember |
Total cost of repurchase of treasury shares |  |  |  | $ 8,600,000 crl_CostOfRepurchaseOfTreasuryShares / crl_StockRepurchasesAxis = crl_TwoThousandSevenIncentivePlanMember | $ 6,700,000 crl_CostOfRepurchaseOfTreasuryShares / crl_StockRepurchasesAxis = crl_TwoThousandSevenIncentivePlanMember |

X
- Definition The cost to reacquire common stock during the period. + References No definition available. + Details
Name: | crl_CostOfRepurchaseOfTreasuryShares
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Stock Repurchase Program, Authorized Amount Increase (Decrease) + References No definition available. + Details
Name: | crl_StockRepurchaseProgramAuthorizedAmountIncreaseDecrease
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | crl_StockRepurchasesLineItems
Namespace Prefix: | crl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_TreasuryStockSharesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | crl_StockRepurchasesAxis=crl_OpenMarketRepurchasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | crl_StockRepurchasesAxis=crl_TwoThousandSevenIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |