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Share-based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 03, 2015 shares | Nov. 30, 2009 shares | Oct. 31, 2019 shares | Sep. 30, 2020 CNY (¥) | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 CNY (¥) | Sep. 30, 2019 $ / shares | Sep. 30, 2020 USD ($) | Apr. 30, 2018 shares
2019 Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Term of compensation plan |  |  | 10 years |  |  |  |  |  |
NetEase Group [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares-based compensation expense | ¥ |  |  |  | ¥ 2,177,000 |  | ¥ 3,183,000 |  |  |
NetEase Group [Member] | 2009 RSU Plan [Member] | Restricted share units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares reserved for future issuance |  | 323,694,050 |  |  |  |  |  |  |
Term of compensation plan |  | 10 years |  |  |  |  |  |  |
NetEase Group [Member] | 2019 Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares reserved for future issuance |  |  | 322,458,300 |  |  |  |  |  |
Youdao, Inc. [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average grant date fair value of share options granted | $ / shares |  |  |  |  | $ 23.37 |  | $ 4.12 |  |
Fair value of options vested |  |  |  | 11,536,000 | $ 1,699 | 0 |  |  |
Youdao, Inc. [Member] | 2015 Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares reserved for future issuance | 8,000,000 |  |  |  |  |  |  |  | 10,222,222
Term of compensation plan | 10 years |  |  |  |  |  |  |  |
Shares-based compensation expense | ¥ |  |  |  |  |  | ¥ 0 |  |  |
Total unrecognized compensation expense |  |  |  | ¥ 108,966,000 |  |  |  | $ 16,049 |
Weighted average remaining vesting period |  |  |  | 2 years 5 months 19 days | 2 years 5 months 19 days |  |  |  |
Additional number of shares reserved for future issuance |  |  |  |  |  |  |  |  | 2,222,222

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