Organization and principal activities - Schedule of Details of the Subsidiaries, VIEs and VIE's Subsidiaries (Detail)	12 Months Ended
Mar. 31, 2021
Guangcheng (Shanghai) Information Technology Co., Ltd. [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Shanghai, the PRC
Date of incorporation or acquisition	Nov. 30, 2012
Percentage of direct or indirect	100.00%
Principal activities	Operates the Company’s own online e-commerce platform
Nanjing Xingmu Biotechnology Co., Ltd. [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Nanjing, the PRC
Date of incorporation or acquisition	Nov. 30, 2019
Percentage of direct or indirect	51.00%
Principal activities	Biotechnology research and development
Boqii (Shanghai) Information Technology Co., Ltd. [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Shanghai, the PRC
Date of incorporation or acquisition	Aug. 31, 2014
Percentage of direct or indirect	90.00%
Principal activities	Technology development
Tianjing Guangcheng Information Technology Co., Ltd. [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Tianjin, the PRC
Date of incorporation or acquisition	Jun. 30, 2017
Percentage of direct or indirect	100.00%
Principal activities	Sales of merchandise
Nanjing Cuida Biotechnology Co. Ltd.("Cuida") [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Nanjing, the PRC
Date of incorporation or acquisition	Apr. 30, 2017
Percentage of direct or indirect	70.00%
Principal activities	Biotechnology extension services
Taizhou Xingmu Biotechnology Co., Ltd. [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Taizhou, the PRC
Date of incorporation or acquisition	Nov. 30, 2019
Percentage of direct or indirect	80.00%
Principal activities	Biotechnology research and development
Boqii Corporation Limited ("Boqii Corporation") [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Hong Kong
Date of incorporation or acquisition	Jul. 31, 2012
Percentage of direct or indirect	100.00%
Principal activities	Investment holding
Boqii International Limited [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Hong Kong
Date of incorporation or acquisition	Aug. 31, 2016
Percentage of direct or indirect	100.00%
Principal activities	Investment holding
Xingmu International Limited [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	British Virgin Islands
Date of incorporation or acquisition	Aug. 31, 2019
Percentage of direct or indirect	51.00%
Principal activities	Investment holding
Xingmu HK Limited [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Hong Kong
Date of incorporation or acquisition	Nov. 30, 2019
Percentage of direct or indirect	51.00%
Principal activities	Investment holding
Nanjing Xinmu Information Technology Co., Ltd. ("Xingmu WFOE") [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Nanjing, the PRC
Date of incorporation or acquisition	Nov. 30, 2019
Percentage of direct or indirect	51.00%
Principal activities	Technology development and sales of merchandise
Xincheng (Shanghai) Information Technology Co., Ltd. ("Shanghai Xincheng") [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Shanghai, the PRC
Date of incorporation or acquisition	Nov. 30, 2012
Percentage of direct or indirect	100.00%
Principal activities	Technology development and sales of merchandise
Shanghai Yiqin Pets Products Co., Ltd. [Member]
Schedule Of Subsidiaries And Variable Interest Entities [Line Items]
Place of incorporation	Shanghai, the PRC
Date of incorporation or acquisition	Feb. 28, 2013
Percentage of direct or indirect	100.00%
Principal activities	Technology development and sales of merchandise

Entity description of principal activities.

No definition available.

Name:	bq_EntityDescriptionOfPrincipalActivities
Namespace Prefix:	bq_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Place of incorporation.

+ References

No definition available.

+ Details

Name:	bq_PlaceOfIncorporation
Namespace Prefix:	bq_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	bq_ScheduleOfSubsidiariesAndVariableInterestEntitiesLineItems
Namespace Prefix:	bq_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Variable interest entity place of incorporation.

+ References

No definition available.

+ Details

Name:	bq_VariableInterestEntityPlaceOfIncorporation
Namespace Prefix:	bq_
Data Type:	xbrli:normalizedStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when an entity was incorporated

+ References

No definition available.

+ Details

Name:	dei_EntityIncorporationDateOfIncorporation
Namespace Prefix:	dei_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the relationship between reporting entity and the Variable Interest Entity (VIE) began, in CCYY-MM-DD format.

+ 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5747-111685

+ Details

Name:	us-gaap_VariableInterestEntityQualitativeOrQuantitativeInformationDateInvolvementBegan1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the transactions or business conducted by the Variable Interest Entity (VIE), including how the VIE is financed.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 16
-Subparagraph (c,d)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6228967-111685

Reference 2: 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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5747-111685

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5728-111685

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5747-111685

+ Details

Name:	us-gaap_VariableInterestEntityVIEActivitiesOfVIE
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ConsolidatedEntitiesAxis=bq_GuangchengShanghaiInformationTechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=bq_NanjingXingmuBiotechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=bq_BoqiiShanghaiInformationTechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=bq_TianjingGuangchengInformationTechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=bq_NanjingCuidaBiotechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=bq_TaizhouXingmuBiotechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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