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Other current assets - Allowance for other current assets (Details)	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
Other current assets
Balance at the beginning of the year	¥ 116,860,992	$ 16,009,890	¥ 256,349,242
Additions/(reversal)	(15,572,138)	(2,133,374)	29,879,226
Charge-offs	(28,617,809)	(3,920,624)	(169,367,476)
Balance at the end of the year	¥ 72,671,045	$ 9,955,892	¥ 116,860,992

X

- Definition

Amount of additions (reversals) on allowance for other current asset.

+ References

No definition available.

+ Details

Name:	qd_AdditionsReversalsOnAllowanceForOtherCurrentAsset
Namespace Prefix:	qd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of allowance for other current assets.

+ References

No definition available.

+ Details

Name:	qd_AllowanceForOtherCurrentAssets
Namespace Prefix:	qd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of charge on allowance for other current asset .

+ References

No definition available.

+ Details

Name:	qd_ChargeOnAllowanceForOtherCurrentAsset
Namespace Prefix:	qd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	qd_OtherCurrentAssetsAbstract
Namespace Prefix:	qd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration