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Investments - Additional Information (Detail) ¥ in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |
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Nov. 20, 2018 CNY (¥) shares | Nov. 20, 2018 USD ($) shares | Oct. 31, 2017 CNY (¥) | Oct. 31, 2020 CNY (¥) shares | Oct. 31, 2020 USD ($) shares | Dec. 31, 2019 CNY (¥) | Jul. 31, 2019 CNY (¥) | Jun. 30, 2019 CNY (¥) | Jan. 31, 2018 CNY (¥) | May 31, 2016 CNY (¥) | Apr. 30, 2015 CNY (¥) | Mar. 31, 2021 CNY (¥) shares | Mar. 31, 2021 USD ($) | Mar. 31, 2020 CNY (¥) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 CNY (¥) | Mar. 31, 2018 CNY (¥) | Mar. 01, 2018 shares
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  |  |  | ¥ 51,346 |  | ¥ 102,373 |  |  |  |
Impairment of AFS securities |  |  |  |  |  |  |  |  |  |  |  | 7,443 |  | 14,259 |  |  |  |
Unrealized securities holding gain/(loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | (31,658) | $ (4,832) | 18,713 |  | ¥ 25,067 |  |
Foreign currency translation adjustments in other comprehensive income |  |  |  |  |  |  |  |  |  |  |  | (72,993) | (11,141) | 105,433 |  | 55,440 |  |
Shares repurchased by investee, total price |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,566 | $ 951 |  |  |
Gain/(Loss) from investments, net |  |  |  |  |  |  |  |  |  |  |  | ¥ 86,497 | 13,202 | (66,550) |  | 31,236 |  |
Stock issued value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 389,364 |  |
Amount of gain (loss) from deconsolidation |  |  | ¥ 13,592 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
iSNOB Holding Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage owned |  |  | 18.00% |  |  |  |  |  |  |  |  | 14.50% |  |  |  |  |  |
Registered capital |  |  |  |  |  |  |  |  |  | ¥ 1,000 |  |  |  |  |  |  |  |
iSNOB Holding Limited | Unrelated Third Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
iSNOB Holding Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage owned |  |  |  | 3.35% | 3.35% |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  |  |  | ¥ 22,595 |  | 76,841 |  |  |  |
Impairment of AFS securities |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |
Unrealized securities holding gain/(loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | 8,714 |  | 36,459 |  | 15,670 |  |
Ownership percentage |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |
Foreign currency translation adjustments in other comprehensive income |  |  |  |  |  |  |  |  |  |  |  | ¥ 3,717 |  | 2,004 |  | 1,470 |  |
Gain/(Loss) from investments, net |  |  |  | ¥ 91,184 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of realized and unrealized gain (loss) on shares sold |  |  |  | 46,029 |  |  |  |  |  |  |  |  |  |  |  |  |  |
iSNOB Holding Limited | Consolidated Statements of Operations And Comprehensive Loss | Preferred Shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued value |  |  |  | ¥ 13,215 |  |  |  |  |  |  |  |  |  |  |  |  |  |
iSNOB Holding Limited | Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period, Percentage |  |  |  | 73.40% | 73.40% |  |  |  |  |  |  |  |  |  |  |  |  |
iSNOB Holding Limited | United States of America, Dollars | Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased by investee, total price | $ |  |  |  |  | $ 16,000 |  |  |  |  |  |  |  |  |  |  |  |  |
iSNOB Holding Limited | Japan, Yen | Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased by investee, total price |  |  |  | ¥ 104,399 |  |  |  |  |  |  |  |  |  |  |  |  |  |
iSNOB Holding Limited | Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible and redeemable preferred shares held | shares |  |  |  | 4,785,714 | 4,785,714 |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |
Huzan Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage owned | 6.72% |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  | ¥ 10,000 |  |  |  |  |  |  |  |  |
Available-for-sale debt securities | ¥ 13,658 |  |  |  |  |  |  |  |  |  |  | ¥ 1,686 |  | 10,996 |  |  | ¥ 14,021 |
Impairment of AFS securities |  |  |  |  |  |  |  |  |  |  |  | 4,055 |  |  |  |  |  |
Unrealized securities holding gain/(loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,862 |  |  | 3,016 |
Foreign currency translation adjustments in other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,036) |  |  |  |
Shares repurchased by investee | shares | 6,246,877 | 6,246,877 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased by investee, total price | ¥ 35,501 | $ 5,172 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from investment disposal | ¥ 31,236 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value increase or decrease |  |  |  |  |  |  |  |  |  |  |  | 9,310 |  |  |  |  |  |
Amount of reversed unrealized holding gain (loss) |  |  |  |  |  |  |  |  |  |  |  | 5,145 |  |  |  |  |  |
Shanghai Kuailaimai Information and Technology Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage owned |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  | ¥ 7,500 |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 14,259 |  |
Impairment of AFS securities |  |  |  |  |  |  |  | ¥ 14,259 |  |  |  | 0 |  | 14,259 |  |  |  |
Unrealized securities holding gain/(loss), net of tax |  |  |  |  |  |  |  | 6,759 |  |  |  |  |  |  |  | (1,588) | ¥ 4,912 |
Gain/(Loss) from investments, net |  |  |  |  |  |  |  | ¥ 7,500 |  |  |  |  |  |  |  |  |  |
Hangzhou Ruisha Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage owned |  |  |  |  |  |  | 18.10% |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  |  |  | 19,065 |  | 7,623 |  |  |  |
Unrealized securities holding gain/(loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | 9,726 |  | ¥ 487 |  |  |  |
Hangzhou Ruisha Technology Co Ltd | Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | ¥ 7,000 |  |  |  |  |  |  |  |  |  |  |
Hangzhou Ruisha Technology Co Ltd | Intangible Asset With Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | ¥ 50 |  |  |  |  |  |  |  |  |  |  |
Xuanwei Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage owned |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  |  |  | 0 |  | ¥ 3,525 |  |  |  |
Unrealized securities holding gain/(loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | 2,389 |  |  |  |  |  |
Consideration received |  |  |  |  |  |  |  |  |  |  |  | ¥ 5,914 | $ 900 |  |  |  |  |
Xuanwei Limited | United States of America, Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |
Xuanwei Limited | Japan, Yen |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,525 |  |  |  |
JM Weshop (Cayman) Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment shares owned | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000
Equity method investment ownership percentage |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |  |  | 40.00%
ESOP Shares that may be transferred to grantees who are employees of JM Weshop | shares |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |
Share of income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | (114,104) |  | 5,752 |  |
Share of other comprehensive (loss)/income |  |  |  |  |  |  |  |  |  |  |  |  |  | (145) |  | 938 |  |
Equity Method Investment Decrease Percent |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Gain loss on sale of equity method investment |  |  |  |  |  |  | ¥ 25,132 |  |  |  |  |  |  |  |  |  |  |
Equity method investment impairment |  |  |  |  |  | ¥ 33,918 |  |  |  |  |  |  |  | 33,918 |  |  |  |
JM Weshop (Cayman) Inc. | Investment Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 934 |  | 1,084 |  |
JM Weshop (Cayman) Inc. | Share of Results of Equity Investee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 1,390 |  | ¥ 1,483 |  |
JM Weshop (Cayman) Inc. | Flying Get Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00%
Jiaxing Neixiangyoupan Equity Investment Fund Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  |  |  |  |  |  |  |  |  | 14.80% |  |  |  |  |  |
Share of income/(loss) |  |  |  |  |  |  |  |  |  |  |  | ¥ 478 |  |  |  |  |  |
The value of ownership under the equity method investments |  |  |  |  |  |  |  |  |  |  |  | ¥ 12,000 |  |  |  |  |  |

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