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Depreciation, amortization, shipping and handling expenses - Summary of Depreciation and Amortization (Parenthetical) (Detail) ¥ in Millions | 12 Months Ended
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Dec. 31, 2020 CNY (¥)
COVID - 19 [Member] |
Disclosure of income statement [line items] |
Rent Rebate Income | ¥ 0.2

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