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1. Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Prepaid expenses $ 124,179       $ 109,136       $ 124,179 $ 109,136  
Other current assets 23,604       10,089       23,604 10,089  
Property, Plant and Equipment, Net 498,612       511,639       498,612 511,639  
Other Assets         104,200         104,200  
Other assets 94,599       104,189       94,599 104,189  
Income taxes payable 11,929       10,319       11,929 10,319  
Deferred Income Tax Liabilities, Net 1,770,481       3,064,576       1,770,481 3,064,576  
Retained Earnings (Accumulated Deficit) 9,898,203       13,525,343       9,898,203 13,525,343  
Accumulated other comprehensive (loss) income (466,822)       (175,553)       (466,822) (175,553)  
Cost of Goods and Services Sold                 1,234,919 1,284,449 $ 1,107,739
Selling, general and administrative expense                 827,825 877,122 798,798
Research and development expense                 256,889 260,638 217,763
Income from operations                 482,616 500,336 421,326
Income Tax Expense (Benefit)                 1,076,738 (1,194,798) (1,103,778)
Net Income (Loss) Attributable to Parent $ 827,700 $ (162,800) $ (925,100) $ (3,367,300) $ (1,572,200) $ 3,929,600 $ 916,800 $ 980,000 $ (3,627,535) $ 4,254,257 $ 3,814,229
Earnings Per Share, Basic $ 27.89 $ (5.48) $ (31.05) $ (112.5) $ (52.54) $ 131.80 $ 30.80 $ 32.86 $ (121.79) $ 142.61 $ 128.13
Earnings Per Share, Diluted $ 27.78 $ (5.48) $ (31.05) $ (112.5) $ (52.54) $ 130.02 $ 30.41 $ 32.46 $ (121.79) $ 140.83 $ 126.47
Comprehensive income attributable to Bio-Rad                 $ (3,918,804) $ 3,796,248 $ 4,184,033
Net cash provided by operating activities                 194,447 669,464 584,972
Net cash used in investing activities                 $ (1,207,593) (797,381) (69,894)
Prepaid Expense         $ 109,100         109,100  
Previously Reported                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Prepaid expenses         107,700         107,700  
Property, Plant and Equipment, Net         491,000         491,000  
Other assets         102,700         102,700  
Deferred Income Tax Liabilities, Net         3,059,100         3,059,100  
Retained Earnings (Accumulated Deficit)         13,507,200         13,507,200  
Cost of Goods and Services Sold                   1,281,900 1,107,800
Selling, general and administrative expense                   879,600 800,300
Research and development expense                   271,700 226,600
Income from operations                   489,400 411,000
Income Tax Expense (Benefit)                   1,192,200 1,101,400
Net Income (Loss) Attributable to Parent                   $ 4,245,900 $ 3,806,300
Earnings Per Share, Basic                   $ 142.33 $ 127.86
Earnings Per Share, Diluted                   $ 140.56 $ 126.20
Net cash provided by operating activities                   $ 656,500 $ 575,300
Net cash used in investing activities                   (784,400) (60,300)
Revision of Prior Period, Adjustment                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Prepaid expenses         1,400         1,400  
Property, Plant and Equipment, Net         20,700         20,700  
Other assets         1,500         1,500  
Deferred Income Tax Liabilities, Net         5,500         5,500  
Retained Earnings (Accumulated Deficit)         $ 18,100         18,100  
Cost of Goods and Services Sold                   2,600 (100)
Selling, general and administrative expense                   (2,500) (1,500)
Research and development expense                   (11,100) (8,800)
Income from operations                   10,900 10,400
Income Tax Expense (Benefit)                   2,600 2,400
Net Income (Loss) Attributable to Parent                   $ 8,400 $ 8,000
Earnings Per Share, Basic                   $ 0.28 $ 0.27
Earnings Per Share, Diluted                   $ 0.27 $ 0.27
Net cash provided by operating activities                   $ 13,000 $ 9,600
Net cash used in investing activities                   $ (13,000) $ (9,600)