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Earnings Per Share ("EPS") (Tables) | 9 Months Ended
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Sep. 30, 2012
Computation of Basic and Diluted Net Income Attributable to Baidu, Inc. Per Share for Class A and Class B Ordinary Shares | The following table sets forth the computation of basic and diluted net income attributable to Baidu, Inc. per share for Class A and Class B ordinary shares:
|  | For the nine months ended |
|  | September 30, 2011 |  |  | September 30, 2012 |
|  | Class A |  |  | Class B |  |  | Class A |  |  | Class A |  |  | Class B |  |  | Class B |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |  |  | RMB |  |  | US$ |
Earnings per share — basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. |  |  | 3,559,218 |  |  |  | 1,025,749 |  |  |  | 5,932,166 |  |  |  | 943,891 |  |  |  | 1,706,237 |  |  |  | 271,486 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding |  |  | 27,079,835 |  |  |  | 7,804,274 |  |  |  | 27,129,111 |  |  |  | 27,129,111 |  |  |  | 7,803,000 |  |  |  | 7,803,000 |
Denominator used for earnings per share |  |  | 27,079,835 |  |  |  | 7,804,274 |  |  |  | 27,129,111 |  |  |  | 27,129,111 |  |  |  | 7,803,000 |  |  |  | 7,803,000 |
Earnings per share — basic |  |  | 131.43 |  |  |  | 131.43 |  |  |  | 218.66 |  |  |  | 34.79 |  |  |  | 218.66 |  |  |  | 34.79 |
Earnings per share — diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. |  |  | 3,561,491 |  |  |  | 1,023,476 |  |  |  | 5,934,416 |  |  |  | 944,249 |  |  |  | 1,703,987 |  |  |  | 271,128 |
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares |  |  | 1,023,476 |  |  |  | — |  |  |  | 1,703,987 |  |  |  | 271,128 |  |  |  | — |  |  |  | — |
Allocation of net income attributable to Baidu, Inc. |  |  | 4,584,967 |  |  |  | 1,023,476 |  |  |  | 7,638,403 |  |  |  | 1,215,377 |  |  |  | 1,703,987 |  |  |  | 271,128 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding |  |  | 27,079,835 |  |  |  | 7,804,274 |  |  |  | 27,129,111 |  |  |  | 27,129,111 |  |  |  | 7,803,000 |  |  |  | 7,803,000 |
Conversion of Class B to Class A ordinary shares |  |  | 7,804,274 |  |  |  | — |  |  |  | 7,803,000 |  |  |  | 7,803,000 |  |  |  | — |  |  |  | — |
Share-based awards |  |  | 77,471 |  |  |  | — |  |  |  | 46,130 |  |  |  | 46,130 |  |  |  | — |  |  |  | — |
Denominator used for earnings per share |  |  | 34,961,580 |  |  |  | 7,804,274 |  |  |  | 34,978,241 |  |  |  | 34,978,241 |  |  |  | 7,803,000 |  |  |  | 7,803,000 |
Earnings per share — diluted |  |  | 131.14 |  |  |  | 131.14 |  |  |  | 218.38 |  |  |  | 34.75 |  |  |  | 218.38 |  |  |  | 34.75 |
Earnings per ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator used for earnings per ADS — basic |  |  | 270,798,350 |  |  |  |  |  |  |  | 271,291,110 |  |  |  | 271,291,110 |  |  |  |  |  |  |  |  |
Denominator used for earnings per ADS — diluted |  |  | 349,615,800 |  |  |  |  |  |  |  | 349,782,410 |  |  |  | 349,782,410 |  |  |  |  |  |  |  |  |
Earnings per ADS — basic |  |  | 13.14 |  |  |  |  |  |  |  | 21.87 |  |  |  | 3.48 |  |  |  |  |  |  |  |  |
Earnings per ADS — diluted |  |  | 13.11 |  |  |  |  |  |  |  | 21.84 |  |  |  | 3.48 |  |  |  |  |  |  |  |  |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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