Receivable for issuance of ordinary shares - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
Mar. 31, 2023 CNY (¥)	Mar. 31, 2022 CNY (¥)	Mar. 31, 2023 USD ($)
Receivable For The Issuance Of Ordinary Shares [Line Items]
Proceeds from contributed capital	¥ 87,900	¥ 262,900
Interest income on subscription receivable from shareholders	6,100	14,200
Receivable for the issuance of ordinary shares	¥ 83,400	¥ 164,746	$ 12,145

Interest income on subscription receivable from shareholders.

No definition available.

Name:	bq_InterestIncomeOnSubscriptionReceivableFromShareholders
Namespace Prefix:	bq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Receivable for the issuance of ordinary shares.

+ References

No definition available.

+ Details

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

- Definition

The cash inflow associated with the amount received by a corporation from a shareholder during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromContributedCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount due from owner or affiliate of reporting entity for issuance of shares. Includes, but is not limited to, amount due for award under share-based payment arrangement. Excludes amount due from officer or director.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29,30)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant