UNAUDITED CONDENSED INTERIM STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - shares	Apr. 02, 2018	Mar. 31, 2019
UNAUDITED CONDENSED INTERIM STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
Maximum Shares Subject to Forfeiture		937,500
Number of Shares Forfeited	937,500

The maximum number of shares included in common stock subject to forfeiture.

No definition available.

Name:	dfbhu_MaximumSharesSubjectToForfeiture
Namespace Prefix:	dfbhu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant