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PRINCIPAL ACCOUNTING POLICIES - Inventory (Details) $ in Thousands | Mar. 31, 2022 CNY (¥) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 CNY (¥) | Mar. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
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PRINCIPAL ACCOUNTING POLICIES |  |  |  |  |
Inventories | ¥ 426,300,000 | $ 67,240 | ¥ 69,587,000 |  |
Inventory provision | ¥ 14,200,000 |  | ¥ 4,700,000 | ¥ 0 | ¥ 0

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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