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Operations and Reorganization - Schedule Of Subsidiaries And Variable Interest Entities (Detail)	9 Months Ended
	Sep. 30, 2020
Youdao (Hong Kong) Limited [Member]
Subsidiaries And Variable Interest Entity [Line Items]
Place and year of incorporation	Hong Kong, China, 2016
Percentage of direct or indirect economic ownership	100.00%
Principal activities	Holding company
NetEase Youdao Information Technology Beijing Co.,Ltd. [Member]
Subsidiaries And Variable Interest Entity [Line Items]
Place and year of incorporation	Beijing, China, 2006
Percentage of direct or indirect economic ownership	100.00%
Principal activities	Providing sales of smart devices and solutions, technical support to the VIEs
NetEase Langsheng (Beijing) Technology Development Co., Ltd. [Member]
Subsidiaries And Variable Interest Entity [Line Items]
Place and year of incorporation	Beijing, China, 2017
Percentage of direct or indirect economic ownership	85.00%
Principal activities	Providing consulting services
NetEase Youdao Information Technology (Hangzhou) Co., Ltd. [Member]
Subsidiaries And Variable Interest Entity [Line Items]
Place and year of incorporation	Hangzhou, China, 2019
Percentage of direct or indirect economic ownership	100.00%
Principal activities	Providing technical support to the VIEs
Beijing NetEase Youdao Computer System Co., Ltd. [Member]
Subsidiaries And Variable Interest Entity [Line Items]
Place and year of incorporation	Beijing, China, 2007
Percentage of direct or indirect economic ownership	100.00%
Principal activities	Providing online learning services as well as online marketing services

X

- Definition

Entity incorporation place and date of incorporation.

+ References

No definition available.

+ Details

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- Definition

Principal activities.

+ References

No definition available.

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X

- Definition

Subsidiaries And Variable Interest Entity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685

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X

- Details

Name:	srt_OwnershipAxis=dao_YoudaoHongKongLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_OwnershipAxis=dao_NetEaseYoudaoInformationTechnologyBeijingCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_OwnershipAxis=dao_NeteaseLangshengbeijingTechnologyDevelopmentCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_OwnershipAxis=dao_NeteaseYoudaoInformationTechnologyCoLtdMember
Namespace Prefix:
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Balance Type:
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X

- Details

Name:	srt_OwnershipAxis=dao_BeijingNeteaseYoudaoComputerSystemCoLtdMember
Namespace Prefix:
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Balance Type:
Period Type: