STATEMENTS OF OPERATIONS [Parenthetical] (USD $)	12 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Reimbursements to affiliate (in dollars)	$ 58,337	$ 121,318
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