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Subsequent Events (Details)	Jan. 28, 2022 USD ($)
Subsequent Event [Member]
Subsequent Events (Details) [Line Items]
Working capital loan	$ 200,000

X

- References

No definition available.

+ Details

Name:	bltsu_SubsequentEventsDetailsLineItems
Namespace Prefix:	bltsu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Working capital loan.

+ References

No definition available.

+ Details

Name:	bltsu_WorkingCapitalLoan
Namespace Prefix:	bltsu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: