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Summary of the Organization, Description of Business and Significant Accounting Policies - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
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Jan. 17, 2013 | Oct. 26, 2012 Funds | Sep. 30, 2013 Funds | Sep. 30, 2012 Funds | Sep. 30, 2011 | Nov. 05, 2013 FBR Funds [Member] | Oct. 26, 2012 FBR Funds [Member] | Sep. 30, 2013 FBR Funds [Member] | Oct. 28, 2013 FBR Funds [Member] | Sep. 30, 2013 Stock Appreciation Right [Member] | Sep. 30, 2013 Incentive Stock Option Plan [Member] | Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2013 Minimum [Member] | Sep. 30, 2013 Maximum [Member]
Partnership Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Hennessy Funds |  |  | 16 |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  |  | $ 3,000 | $ 7,000 |  |  |  |  |  |  |  |  |  |
Number of mutual funds |  |  |  | 13 |  |  |  |  |  |  |  |  |  |
Management contracts impairment amount |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Number of funds acquired |  | 10 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of FBR & Co. (FBRC) deal |  | 2,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Additional loan borrowed |  | 16,300,000 |  |  |  |  |  | 13,286,666 |  |  |  |  |  |
Payments to acquire management contract rights through available cash |  | 3,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Additional capitalized transaction cost |  |  | 1,200,000 | 200,000 |  |  |  |  |  |  |  |  |  |
Initial payment based upon the net asset value of the FBR Funds |  |  |  |  |  |  | 19,692,137 |  |  |  |  |  |  |
Contingent payment based upon the net asset value of the FBR Funds |  |  | 19,193,595 |  |  | 19,193,595 |  |  |  |  |  |  |  |
Contingent payment due under the Asset Purchase Agreement |  |  |  |  |  |  |  |  | 19,193,595 |  |  |  |  |
Long term liability |  |  | 11,625,883 |  |  |  |  | 11,625,883 |  |  |  |  |  |
Estimated useful lives of assets |  |  |  |  |  |  |  |  |  |  |  |  | P1Y | P10Y
Unrecognized tax benefits |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Interest and penalties related to unrecognized tax benefits |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Effective tax rates |  |  | 40.90% | 43.90% |  |  |  |  |  |  |  |  |  |
Principal reasons for differences from the federal statutory rate |  |  | 34.00% |  |  |  |  |  |  |  |  |  |  |
Common stock equivalents (antidilutive) excluded from per share calculation |  |  | 245,998 | 433,438 |  |  |  |  |  |  |  |  |  |
Shares available for issuance | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation percentage criteria description | More than 50% of the outstanding shares |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate number of shares |  |  |  |  |  |  |  |  |  | 50,000 |  |  |  |
Date of grant remaining term of option |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years
Stock option granted to fair value |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Percentage of exercise price of fair value |  |  |  |  |  |  |  |  |  |  |  |  | 110.00% |
Maximum Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 4 years |  | 5 years
Maximum aggregate fair market value of shares |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Shares grant period |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Option Reserve for Common Stock |  |  | 2,043,791 |  |  |  |  |  |  |  |  |  |  |
Option vested and exercisable |  |  | 185,998 |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price |  |  | $ 7.09 |  |  |  |  |  |  |  |  |  |  |
Number of Options Exercised |  |  | 247,440 | 5,000 |  |  |  |  |  |  |  |  |  |
Number of options fully vested and exercisable |  |  | 185,998 | 433,438 | 645,050 |  |  |  |  |  |  |  |  |
Restricted stock units, granted |  |  |  |  |  |  |  |  |  |  |  | 60,000 |  |
Rate of restricted stock units vest under plan |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |
compensation expense related to non-vested awards not yet recognized |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |
Recognition of Compensation Expenses |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration