Subsequent Event (Tables)

12 Months Ended

Sep. 30, 2012

Fund [Abstract]

Schedule of note maturity

Year ended September 30:
2013	$	625,000
2014		625,000
2015		677,083
Total	$	1,927,083

Future amortization expense

Year ended September 30:
2013	$	6,250
2014		6,250
2015		6,250
Total	$	18,750

Current management and 12b- 1 fees

Fund	Management Fee (as a % of fund assets)			12b-1 Fee (as a % of fund assets)
Investor Class Shares
Hennessy Large Cap Financial Fund		0.90	%		0.25	%
Hennessy Small Cap Financial Fund		0.90	%		0.25	%
Hennessy Technology Fund		0.90	%		0.25	%
Hennessy Focus Fund		0.90	%		0.25	%
Hennessy Gas Utility Index Fund		0.40	%		—
Hennessy Equity and Income Fund		0.80	%		0.25	%
Hennessy Core Bond Fund		0.80	%		0.25	%
Institutional Class Shares
Hennessy Small Cap Financial Fund		0.90	%		—
Hennessy Technology Fund		0.90	%		—
Hennessy Focus Fund		0.90	%		—
Hennessy Equity and Income Fund		0.80	%		—
Hennessy Core Bond Fund		0.80	%		—

Current sub-advisor fees

Sub-Advisor	Sub-Advisor Fee (as a percentage of fund assets)
Hennessy Core Bond Fund
FCI		0.27	%*
Hennessy Equity and Income Fund
FCI		0.27	%
London Co.		0.33	%
Hennessy Focus Fund
Broad Run Investment Management, LLC		0.29	%

FBR funds [Member]

Fund [Abstract]

Schedule of note maturity

Year ended September 30:
2013	$	1,686,667
2014		1,840,000
2015		1,840,000
2016		1,840,000
2017		1,840,000
2018		9,353,333
Total	$	18,400,000

Future amortization expense

Year ended September 30:
2013	$	45,753
2014		49,912
2015		49,912
2016		49,912
2017		49,912
2018		4,159
Total	$	249,560