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Interest and investment income, net - Gain/(loss) on derivative instruments (Details) | 12 Months Ended
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Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
Interest and investment income, net |  |  |  |
Unrealized investment income/(loss) of derivative instruments | ¥ 222,975,608 | $ 30,547,533 | ¥ (149,741,836) | ¥ (180,503,919)
Realized investment income/(loss) of derivative instruments | (203,518,248) | (27,881,886) | 303,576,774 | 110,083,438
Gain/(loss) on derivative instruments | ¥ 19,457,360 | $ 2,665,647 | ¥ 153,834,938 | ¥ (70,420,481)

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- Definition The amount represents the realized investment income/(loss) of derivative instruments. + References No definition available. + Details
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Namespace Prefix: | qd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount represents the unrealized investment income (loss) of derivative instruments. + References No definition available. + Details
Name: | qd_UnrealizedInvestmentIncomeLossOfDerivativeInstruments
Namespace Prefix: | qd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- References No definition available. + Details
Name: | us-gaap_InvestmentIncomeInterestAndDividendAbstract
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Data Type: | xbrli:stringItemType
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