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7. Stockholders' Equity (Details) | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2013 | Dec. 31, 2011
Common Class A [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares, Issued | 23,972,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 23,681,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 23,333,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 23,020,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Stock Issued During Period, Shares, Conversion of Convertible Securities | 5,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 80,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 59,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Stock Issued During Period, Shares, New Issues | 286,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 269,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 253,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Common Stock, Voting Rights | .10 |  |  |  |
Election Percentage for Board of Directors | 25.00%bio_ElectionPercentageForBoardOfDirectors / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Common Class B [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares, Issued | 5,099,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 5,097,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 5,150,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 5,165,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Stock Issued During Period, Shares, Conversion of Convertible Securities | (5,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | (80,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | (59,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Stock Issued During Period, Shares, New Issues | 7,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 27,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 44,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Common Stock, Voting Rights | 1 |  |  |  |
Election Percentage for Board of Directors | 75.00%bio_ElectionPercentageForBoardOfDirectors / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |
Treasury Class-A [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  | 122 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = bio_TreasuryClassAMember |
Treasury Class B [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  | 917 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = bio_TreasuryClassBMember |

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