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Variable Interest Entity and Redeemable Non-Controlling Interest - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		13 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Jul. 31, 2024
Noncontrolling Interest [Line Items]
Other long-term liability, deferred compensation				$ 0.8
Braze KK
Noncontrolling Interest [Line Items]
Consideration received	$ 5.0	$ 5.0	$ 10.0

X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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

X

- Details

Name:	dei_LegalEntityAxis=brze_BrazeKKMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: