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SHARE-BASED COMPENSATION - Additional Information (Detail) ¥ / shares in Units, ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
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Nov. 30, 2019 ¥ / shares shares | Oct. 31, 2018 ¥ / shares shares | Sep. 30, 2016 ¥ / shares shares | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2019 CNY (¥) ¥ / shares shares | Dec. 31, 2019 USD ($) shares | Mar. 31, 2019 | Dec. 31, 2018 CNY (¥) ¥ / shares | Mar. 31, 2018 | Dec. 31, 2017 CNY (¥) ¥ / shares | Mar. 31, 2017
Options granted in period |  |  |  |  |  |  | 288,000 | 288,000 |  |  |  |  |
Options exercise price | ¥ / shares |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value of options granted | ¥ / shares |  |  |  |  |  |  | ¥ 50.36 |  |  | ¥ 84.88 |  | ¥ 18.16 |
Share-based compensation expense |  |  |  |  |  |  | ¥ 147,582 | $ 21,199 |  | ¥ 67,778 |  | ¥ 89,396 |
Total unrecognized compensation cost related to non-vested stock options | ¥ |  |  |  |  |  |  | ¥ 55,917 |  |  | ¥ 222,928 |  | ¥ 74,962 |
Total unrecognized compensation cost related to non-vested stock options, weighted-average period |  |  |  |  |  |  | 2 years 6 months 3 days | 2 years 6 months 3 days |  | 3 years 6 months 18 days |  | 3 years 3 months |
Unrecognized share-based compensation expense recognized | ¥ |  |  |  |  |  |  | ¥ 39,390 |  |  |  |  |  |
Options cancelled |  |  | 2,377,000 |  |  |  | (3,546,000) | (3,546,000) |  |  |  |  |
Two Thousand Nineteen Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted in period | 288,000 |  |  |  |  |  |  |  |  |  |  |  |
Options exercise price | ¥ / shares | ¥ 3.5 |  |  |  |  |  |  |  |  |  |  |  |
Two Thousand Sixteen incentive paln |  |  |  |  |  |  |  |  |  |  |  |  |
Options cancelled |  |  |  |  |  |  | 2,377,000 | 2,377,000 |  |  |  |  |
Two Thousand Eighteen incentive paln |  |  |  |  |  |  |  |  |  |  |  |  |
Options cancelled |  | 1,169,000 |  |  |  |  |  |  |  |  |  |  |
Shanghai Jiayin Finance Technology Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total outstanding shares |  |  | 27.00% |  |  |  |  |  |  |  |  |  |
Shanghai Jiayin Finance Technology Co., Ltd. | Share-based Compensation Award, Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted in period |  |  | 13,321,500 |  |  |  |  |  |  |  |  |  |
Options exercise price | ¥ / shares |  |  | ¥ 3.5 |  |  |  |  |  |  |  |  |  |
Shanghai Jiayin Finance Technology Co., Ltd. | Share-based Compensation Award, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted in period |  | 2,851,600 |  |  |  |  |  |  |  |  |  |  |
Options exercise price | ¥ / shares |  | ¥ 3.5 |  |  |  |  |  |  |  |  |  |  |
Shanghai Jiayin Finance Technology Co., Ltd. | Employee Stock | Share-based Compensation Award, Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |
Options life |  |  | 4 years 6 months |  |  |  |  |  |  |  |  |  |
Options vesting percentage |  |  |  |  |  | 30.00% |  |  | 30.00% |  | 25.00% |  | 15.00%
Shanghai Jiayin Finance Technology Co., Ltd. | Employee Stock | Share-based Compensation Award, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |
Options life |  | 4 years 6 months |  |  |  |  |  |  |  |  |  |  |
Options vesting percentage |  |  |  | 30.00% | 30.00% | 25.00% |  |  | 15.00% |  |  |  |
Shanghai Jiayin Finance Technology Co., Ltd. | Employee incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |
Shares that will be used under the Plan |  |  | 13,500,000 |  |  |  |  |  |  |  |  |  |

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