CONDENSED STATEMENTS OF OPERATIONS [Parenthetical] (USD $)	3 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Reimbursements to affiliate (in dollars)	$ 12,954	$ 12,898
Limited Partner Units	36,497	36,497

The average number of shares or units issued and outstanding that are used in calculating basic and diluted EPS.

No definition available.

Name:	bftcviii_LimitedPartnerUnits
Namespace Prefix:	bftcviii_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration