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Taxes Payable - Additional Information (Detail) - CNY (¥) ¥ in Thousands	1 Months Ended
	Oct. 31, 2020	Sep. 30, 2020
Taxes Payable [Abstract]
Income tax withheld share based compensation option exercise		¥ 18,809
Payment tax with holding share based payment arrangement	¥ 18,809

X

- Definition

Income tax witheld share based compensation option exercise.

+ References

No definition available.

+ Details

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Namespace Prefix:	dao_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration