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10. Other Income and Expenses (Details) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Gain (Loss) on Disposition of Property Plant Equipment $ (400,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment $ (500,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment $ 4,800,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment  
Interest and investment income (13,500,000)us-gaap_InvestmentIncomeInterestAndDividend (13,400,000)us-gaap_InvestmentIncomeInterestAndDividend (11,400,000)us-gaap_InvestmentIncomeInterestAndDividend  
Net realized losses (gains) on investments 0us-gaap_RealizedInvestmentGainsLosses 300,000us-gaap_RealizedInvestmentGainsLosses (8,700,000)us-gaap_RealizedInvestmentGainsLosses  
Other-than-temporary impairment losses on investments 400,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 300,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 1,000,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet  
Gain (Loss) on Disposition of Assets (400,000)us-gaap_GainLossOnDispositionOfAssets1 (500,000)us-gaap_GainLossOnDispositionOfAssets1 3,800,000us-gaap_GainLossOnDispositionOfAssets1  
Miscellaneous Other (Income) Expense Items, Net (300,000)bio_MiscellaneousOtherIncomeExpenseItems (500,000)bio_MiscellaneousOtherIncomeExpenseItems 1,000,000bio_MiscellaneousOtherIncomeExpenseItems  
Other (income) expense, net 13,009,000us-gaap_OtherNonoperatingIncomeExpense 12,766,000us-gaap_OtherNonoperatingIncomeExpense 21,883,000us-gaap_OtherNonoperatingIncomeExpense  
Goodwill, Written off Related to Sale of Business Unit 0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit 0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit 1,000,000us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit  
Clinical Diagnostics [Member]        
Consideration for sale of building       6,400,000bio_ConsiderationForSaleOfBuilding
/ us-gaap_StatementBusinessSegmentsAxis
= bio_ClinicalDiagnosticsMember
Gain (Loss) on Disposition of Property Plant Equipment       4,300,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= bio_ClinicalDiagnosticsMember
Goodwill, Written off Related to Sale of Business Unit       $ 1,000,000us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= bio_ClinicalDiagnosticsMember