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CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY - Statements of cash flows (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 (¥) | Dec. 31, 2019 CNY (¥)
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |
Net cash generated from/ (used in) operating activities | ¥ (411,271) | ¥ (844,962) | $ (133,288) | ¥ (1,122,308) | ¥ (1,194,101)
Net cash generated from investing activities | 159,898 | (16,769) | (2,646) | 443,016 | (484,254)
Net cash (used in)/ generated from financing activities | (165,519) | 764,422 | 120,585 | 130,317 | 73,630
Effect of exchange rate changes on cash and cash equivalents | 4,065 | (113) | (18) | (14,741) | 960
Net (decrease)/increase in cash and cash equivalents | (412,827) | (97,422) | (15,367) | (563,716) | (1,603,765)
Cash, cash equivalents and restricted cash at beginning of the period | 1,185,188 | 233,719 | 36,868 | 797,435 | 1,812,702
Cash, cash equivalents and restricted cash at end of the period | 797,435 | 136,297 | $ 21,501 | 233,719 | 1,185,188
Parent Company | Reportable Legal Entities |  |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |
Net cash generated from/ (used in) operating activities | (218) | (52,104) |  | (35,016) | 18,977
Net cash generated from investing activities |  |  |  |  | 755,553
Net cash (used in)/ generated from financing activities | (2,058) | 52,379 |  | 34,308 | (781,527)
Effect of exchange rate changes on cash and cash equivalents | 16 | (22) |  | (27) | 50
Net (decrease)/increase in cash and cash equivalents | (2,260) | 253 |  | (735) | (6,947)
Cash, cash equivalents and restricted cash at beginning of the period | 3,341 | 346 |  | 1,081 | 10,288
Cash, cash equivalents and restricted cash at end of the period | ¥ 1,081 | ¥ 599 |  | ¥ 346 | ¥ 3,341

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