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Restructuring - Severance and Retention Cost Liability (Details) (USD $)
3 Months Ended
Mar. 28, 2015
Dec. 27, 2014
Restructuring Reserve [Roll Forward]    
Balance, beginning of period $ 2,666,000us-gaap_RestructuringReserve  
Expense 1,130,000us-gaap_RestructuringCharges  
Payments and Adjustments (1,621,000)us-gaap_PaymentsForRestructuring  
Balance, end of period 2,175,000us-gaap_RestructuringReserve  
Accrued Compensation [Member]    
Restructuring Cost and Reserve [Line Items]    
Severance and retention costs, current 1,800,000us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= crl_AccruedCompensationMember
2,200,000us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= crl_AccruedCompensationMember
Other Long-Term Liabilities [Member]    
Restructuring Cost and Reserve [Line Items]    
Severance and retention costs, noncurrent $ 400,000us-gaap_RestructuringReserveNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
$ 500,000us-gaap_RestructuringReserveNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember