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GUARANTEE LIABILITIES - Movement of CECL Liabilities (Details) ¥ in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 CNY (¥) | Mar. 31, 2022 CNY (¥) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 CNY (¥) | Mar. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Beginning balance of the period |  | ¥ 2,441 |  |  |  |
Provision for/(reversal of) credit losses |  | (94) |  | ¥ (29,272) | ¥ (1,039,367) | ¥ (255,105)
Ending balance of the period |  | 179 | $ 28 | 2,441 |  |
Guarantee liabilities - contingent |  |  |  |  |  |
Beginning balance of the period |  | 2,269 |  | 702,952 |  |
Guarantee liabilities settled | ¥ (326,204) |  |  | (68,578) |  |
Guarantee liabilities released to Webank |  |  |  | (630,733) |  |
Provision for/(reversal of) credit losses | 804,322 | (2,136) |  | (1,372) |  |
Ending balance of the period | 702,952 | ¥ 133 |  | ¥ 2,269 | 702,952 |
Guarantee liabilities - contingent | ASU 2016-13 |  |  |  |  |  |
Changes on initial application of ASU 2016-13 | ¥ 224,834 |  |  |  | ¥ 224,834 |

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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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