UNAUDITED CONDENSED STATEMENTS OF CHANGES IN SHAREHOLDERS' DEFICIT (Parenthetical)	Feb. 10, 2021 shares
Class B Ordinary Shares [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares subject to forfeiture (in shares)	900,000

Number of common stock shares subject to forfeiture in the event the over-allotment option was not exercised in full by the underwriters.

No definition available.

Name:	bleu_CommonStockSharesSubjectToForfeiture
Namespace Prefix:	bleu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant