Hennessy Japan Fund (HJPNX) N-CSR 8 Jan 25 Certified annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
	Oct. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Hennessy Funds Trust
Entity Central Index Key	0000891944
Entity Investment Company Type	N-1A
Document Period End Date	Oct. 31, 2024

Shareholder Report

Shareholder Report	12 Months Ended
	Oct. 31, 2024 USD ($) Holdings
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Hennessy Funds Trust
Entity Central Index Key	0000891944
Entity Investment Company Type	N-1A
Document Period End Date	Oct. 31, 2024
Hennessy Cornerstone Growth Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Cornerstone Growth Fund
Class Name	Investor Class
Trading Symbol	HFCGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $161 1.29%
Expenses Paid, Amount	$ 161
Expense Ratio, Percent	1.29%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund outperformed both the Russell 2000® Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in the Industrials, Information Technology, and Energy sectors contributed the most to performance. ● Holdings in the Financials, Health Care, and Real Estate sectors detracted the most from performance. ● Stocks that contributed most to performance included Super Micro Computer, Inc., Modine Manufacturing Co., and Sprouts Farmers Market, Inc. ● Stocks that detracted most from performance included Koppers Holdings Inc., Stellantis N.V., and Dave & Buster’s Entertainment, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Cornerstone Growth Fund Russell 2000® Index S&P 500® Index 10/31/2014 10000 10000 10000 11/30/2014 10203 10009 10269 12/31/2014 10359 10294 10243 1/31/2015 10075 9963 9936 2/28/2015 10755 10555 10507 3/31/2015 10857 10738 10340 4/30/2015 10364 10465 10440 5/31/2015 10658 10703 10574 6/30/2015 10771 10784 10369 7/31/2015 10964 10658 10586 8/31/2015 10401 9989 9948 9/30/2015 10203 9498 9702 10/31/2015 10707 10034 10520 11/30/2015 10605 10360 10551 12/31/2015 10246 9840 10385 1/31/2016 9517 8975 9869 2/29/2016 9775 8974 9856 3/31/2016 10219 9690 10525 4/30/2016 9951 9842 10566 5/31/2016 10096 10064 10755 6/30/2016 10262 10058 10783 7/31/2016 10739 10658 11181 8/31/2016 10589 10847 11196 9/30/2016 10605 10968 11199 10/31/2016 10171 10446 10994 11/30/2016 11071 11611 11401 12/31/2016 11104 11936 11627 1/31/2017 11023 11984 11847 2/28/2017 10996 12215 12318 3/31/2017 11055 12231 12332 4/30/2017 11066 12365 12459 5/31/2017 10782 12113 12634 6/30/2017 11066 12532 12713 7/31/2017 11479 12625 12974 8/31/2017 11618 12465 13014 9/30/2017 12492 13243 13283 10/31/2017 12942 13355 13593 11/30/2017 12883 13740 14009 12/31/2017 12947 13685 14165 1/31/2018 13322 14042 14976 2/28/2018 12395 13499 14424 3/31/2018 12481 13673 14058 4/30/2018 12593 13792 14112 5/31/2018 12952 14629 14451 6/30/2018 12797 14734 14540 7/31/2018 12738 14990 15081 8/31/2018 13440 15637 15573 9/30/2018 13263 15260 15662 10/31/2018 11881 13603 14591 11/30/2018 11409 13819 14888 12/31/2018 10200 12178 13544 1/31/2019 11335 13548 14629 2/28/2019 11494 14252 15099 3/31/2019 11064 13954 15393 4/30/2019 11229 14428 16016 5/31/2019 10582 13306 14998 6/30/2019 11482 14246 16055 7/31/2019 11611 14328 16286 8/31/2019 11159 13621 16028 9/30/2019 11117 13904 16328 10/31/2019 11264 14270 16681 11/30/2019 11835 14858 17287 12/31/2019 12311 15286 17809 1/31/2020 11717 14796 17802 2/29/2020 10535 13550 16336 3/31/2020 7476 10606 14319 4/30/2020 8753 12063 16154 5/31/2020 9653 12848 16923 6/30/2020 10176 13302 17260 7/31/2020 10888 13670 18233 8/31/2020 11641 14441 19544 9/30/2020 11747 13958 18801 10/31/2020 11711 14251 18301 11/30/2020 13788 16877 20305 12/31/2020 14494 18337 21085 1/31/2021 14794 19260 20872 2/28/2021 15794 20460 21448 3/31/2021 17029 20666 22387 4/30/2021 17452 21100 23582 5/31/2021 18194 21143 23747 6/30/2021 18252 21553 24301 7/31/2021 17258 20775 24878 8/31/2021 17670 21239 25635 9/30/2021 16882 20613 24443 10/31/2021 17547 21490 26155 11/30/2021 18070 20594 25974 12/31/2021 18681 21055 27138 1/31/2022 16723 19028 25734 2/28/2022 16776 19231 24963 3/31/2022 17695 19470 25890 4/30/2022 17209 17540 23632 5/31/2022 18300 17567 23676 6/30/2022 15946 16122 21721 7/31/2022 17545 17805 23724 8/31/2022 17336 17441 22757 9/30/2022 15468 15769 20661 10/31/2022 17986 17506 22334 11/30/2022 18808 17914 23582 12/31/2022 17761 16752 22223 1/31/2023 18876 18384 23619 2/28/2023 18357 18074 23043 3/31/2023 17467 17210 23889 4/30/2023 16607 16901 24262 5/31/2023 16391 16745 24367 6/30/2023 18822 18106 25977 7/31/2023 20053 19213 26812 8/31/2023 19937 18252 26385 9/30/2023 19712 17178 25127 10/31/2023 18442 16006 24599 11/30/2023 19495 17455 26845 12/31/2023 21239 19588 28065 1/31/2024 22078 18826 28536 2/29/2024 24775 19890 30060 3/31/2024 26617 20602 31027 4/30/2024 25334 19152 29760 5/31/2024 27246 20113 31236 6/30/2024 25707 19927 32356 7/31/2024 27798 21952 32750 8/31/2024 27953 21624 33545 9/30/2024 28023 21775 34261 10/31/2024 27510 21460 33950
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Cornerstone Growth Fund 49.17% 19.55% 10.65% Russell 2000® Index 34.07% 8.50% 7.94% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 511,430,886
Holdings Count | Holdings	50
Advisory Fees Paid, Amount	$ 2,550,903
Investment Company, Portfolio Turnover	94%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $511,430,886 Number of Holdings 50 Annual Portfolio Turnover 94% Total Advisory Fee $2,550,903
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 2.11% Consumer Discretionary 18.88% Consumer Staples 3.78% Energy 4.70% Financials 12.97% Health Care 11.53% Industrials 33.20% Information Technology 7.78% Materials 1.16% Real Estate 1.49% Short-Term Investments and Other 2.34% Liabilities in Excess of Other Assets -0.01% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Cornerstone Growth Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Cornerstone Growth Fund
Class Name	Institutional Class
Trading Symbol	HICGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $121 0.97%
Expenses Paid, Amount	$ 121
Expense Ratio, Percent	0.97%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund outperformed both the Russell 2000® Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in the Industrials, Information Technology, and Energy sectors contributed the most to performance. ● Holdings in the Financials, Health Care, and Real Estate sectors detracted the most from performance. ● Stocks that contributed most to performance included Super Micro Computer, Inc., Modine Manufacturing Co., and Sprouts Farmers Market, Inc. ● Stocks that detracted most from performance included Koppers Holdings Inc., Stellantis N.V., and Dave & Buster’s Entertainment, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Cornerstone Growth Fund Russell 2000® Index S&P 500® Index 10/31/2014 250000 250000 250000 11/30/2014 255110 250224 256724 12/31/2014 259041 257355 256077 01/31/2015 251965 249077 248390 02/28/2015 268999 263864 262665 03/31/2015 271619 268461 258511 04/30/2015 259434 261614 260991 05/31/2015 266771 267587 264347 06/30/2015 269654 269591 259230 07/31/2015 274502 266458 264661 08/31/2015 260482 249713 248693 09/30/2015 255634 237462 242540 10/31/2015 268213 250840 262999 11/30/2015 265723 259000 263781 12/31/2015 256815 245996 259621 01/31/2016 238555 224364 246737 02/29/2016 245123 224354 246404 03/31/2016 256289 242260 263120 04/30/2016 249590 246062 264140 05/31/2016 253268 251605 268883 06/30/2016 257603 251446 269580 07/31/2016 269688 266459 279519 08/31/2016 266010 271171 279912 09/30/2016 266404 274192 279965 10/31/2016 255632 261157 274858 11/30/2016 278358 290279 285037 12/31/2016 279146 298412 290671 01/31/2017 277307 299589 296184 02/28/2017 276782 305371 307944 03/31/2017 278227 305771 308304 04/30/2017 278621 309124 311470 05/31/2017 271527 302835 315853 06/30/2017 278621 313304 317824 07/31/2017 289130 315631 324360 08/31/2017 292677 311616 325353 09/30/2017 314746 331063 332064 10/31/2017 326306 333885 339813 11/30/2017 324992 343508 350235 12/31/2017 326568 342121 354129 01/31/2018 336158 351062 374404 02/28/2018 312775 337469 360605 03/31/2018 315140 341833 351441 04/30/2018 318030 344789 352789 05/31/2018 327225 365718 361285 06/30/2018 323284 368338 363509 07/31/2018 321971 374758 377036 08/31/2018 339705 390914 389322 09/30/2018 335370 381511 391538 10/31/2018 300558 340073 364776 11/30/2018 288736 345478 372210 12/31/2018 258268 304440 338603 01/31/2019 286965 338689 365737 02/28/2019 291002 356297 377480 03/31/2019 280331 348840 384815 04/30/2019 284513 360690 400396 05/31/2019 268362 332639 374952 06/30/2019 291146 356149 401377 07/31/2019 294463 358199 407146 08/31/2019 283071 340513 400696 09/30/2019 282206 347598 408194 10/31/2019 285955 356753 417035 11/30/2019 300520 371438 432173 12/31/2019 312633 382148 445217 01/31/2020 297636 369892 445042 02/29/2020 267641 338754 408407 03/31/2020 190060 265155 357963 04/30/2020 222506 301575 403852 05/31/2020 245434 321200 423087 06/30/2020 258701 332553 431501 07/31/2020 277014 341758 455831 08/31/2020 296194 361014 488596 09/30/2020 298933 348955 470031 10/31/2020 298212 356263 457531 11/30/2020 351135 421931 507614 12/31/2020 369160 458428 527131 01/31/2021 376947 481498 521809 02/28/2021 402616 511507 536198 03/31/2021 434196 516644 559681 04/30/2021 445156 527493 589551 05/31/2021 464190 528581 593669 06/30/2021 465777 538822 607528 07/31/2021 440541 519366 621959 08/31/2021 451212 530983 640871 09/30/2021 431168 515327 611064 10/31/2021 448328 537249 653876 11/30/2021 461739 514862 649345 12/31/2021 477542 526363 678446 01/31/2022 427535 475688 643339 02/28/2022 429000 480766 624076 03/31/2022 452630 486750 647248 04/30/2022 440357 438508 590807 05/31/2022 468383 439171 591891 06/30/2022 408301 403052 543034 07/31/2022 449333 445132 593104 08/31/2022 444204 436023 568916 09/30/2022 396212 394237 516520 10/31/2022 461056 437638 558338 11/30/2022 482122 447860 589540 12/31/2022 455328 418793 555574 01/31/2023 484072 459611 590483 02/28/2023 471128 451848 576076 03/31/2023 448285 430259 597226 04/30/2023 426204 422523 606548 05/31/2023 420874 418620 609184 06/30/2023 483501 452655 649436 07/31/2023 515100 480336 670299 08/31/2023 512244 456306 659627 09/30/2023 506724 429442 628177 10/31/2023 474173 400155 614969 11/30/2023 501394 436372 671131 12/31/2023 546337 489690 701621 01/31/2024 567984 470644 713411 02/29/2024 637521 497255 751504 03/31/2024 685220 515056 775684 04/30/2024 652272 478805 744001 05/31/2024 701886 502826 780892 06/30/2024 662233 498174 808912 07/31/2024 716445 548789 818759 08/31/2024 720660 540591 838619 09/30/2024 722575 544369 856530 10/31/2024 709549 536506 848762
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Cornerstone Growth Fund 49.64% 19.93% 11.00% Russell 2000® Index 34.07% 8.50% 7.94% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 511,430,886
Holdings Count | Holdings	50
Advisory Fees Paid, Amount	$ 2,550,903
Investment Company, Portfolio Turnover	94%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $511,430,886 Number of Holdings 50 Annual Portfolio Turnover 94% Total Advisory Fee $2,550,903
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 2.11% Consumer Discretionary 18.88% Consumer Staples 3.78% Energy 4.70% Financials 12.97% Health Care 11.53% Industrials 33.20% Information Technology 7.78% Materials 1.16% Real Estate 1.49% Short-Term Investments and Other 2.34% Liabilities in Excess of Other Assets -0.01% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Focus Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Focus Fund
Class Name	Investor Class
Trading Symbol	HFCSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $177 1.49%
Expenses Paid, Amount	$ 177
Expense Ratio, Percent	1.49%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund slightly outperformed the Russell 3000® Index (the Fund’s primary benchmark) and slightly underperformed the Russell Midcap® Growth Index. Investment Strategy We implement the Fund’s strategy through a concentrated portfolio of approximately 25 companies that we believe are high-quality businesses with large growth opportunities, excellent management, low tail risk, and discount valuations. We invest with a long-term time horizon and encourage shareholders to do the same. Periods can be influenced by many transitory issues unrelated to the growth in the intrinsic value of the Fund’s holdings. Factors Influencing Performance The biggest contributors to the Fund’s performance relative to the Russell 3000® Index were stock selection in the Communication Services sector, the Fund’s overweighting to the Financials sector, and the Fund’s underweighting to the Health Care sector. The biggest contributors to the Fund’s performance relative to the Russell Midcap® Growth Index were the Fund’s overweighting to the Communication Services sector and the Fund’s underweighting to the Consumer Staples and Health Care sectors. On an individual stock basis, the leading contributors to the Fund’s performance were AST SpaceMobile, Inc. (up 619%), Brookfield Corp. (up 83%), and Applied Materials, Inc. (up 38%). The biggest detractors from the Fund’s performance relative to the Russell 3000® Index were stock selection in the Information Technology and Financials sectors and the Fund’s underweighting to the Informational Technology sector. The biggest detractors from the Fund’s performance relative to the Russell Midcap® Growth Index were stock selection in the Information Technology, Real Estate, and Financials sectors. On an individual stock basis, the leading detractors from the Fund’s performance were Shenandoah Telecommunications Co. (down 41%), Floor & Decor Holdings, Inc. (down 5% since the Fund’s purchase), and CDW Corp. (down 5%).
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Focus Fund Russell 3000® Index Russell Midcap® Growth Index 10/31/2014 10000 10000 10000 11/30/2014 10292 10242 10329 12/31/2014 10470 10242 10299 01/31/2015 10153 9957 10126 02/28/2015 10871 10534 10823 03/31/2015 11020 10427 10853 04/30/2015 10900 10474 10777 05/31/2015 10953 10619 10905 06/30/2015 10988 10441 10729 07/31/2015 11284 10616 10903 08/31/2015 10669 9975 10269 09/30/2015 10415 9684 9872 10/31/2015 11183 10449 10494 11/30/2015 11135 10507 10516 12/31/2015 10771 10291 10279 01/31/2016 10156 9711 9501 02/29/2016 10271 9707 9650 03/31/2016 10984 10391 10338 04/30/2016 11000 10455 10332 05/31/2016 11192 10642 10501 06/30/2016 10925 10664 10500 07/31/2016 11389 11087 11020 08/31/2016 11319 11116 10988 09/30/2016 11249 11133 10982 10/31/2016 11002 10892 10536 11/30/2016 11352 11380 10994 12/31/2016 11542 11602 11032 01/31/2017 11662 11820 11400 02/28/2017 12005 12260 11728 03/31/2017 12062 12268 11793 04/30/2017 12050 12398 11968 05/31/2017 12276 12525 12253 06/30/2017 12438 12638 12290 07/31/2017 12576 12876 12495 08/31/2017 12587 12901 12583 09/30/2017 13022 13216 12939 10/31/2017 13227 13504 13301 11/30/2017 13512 13914 13746 12/31/2017 13766 14053 13820 01/31/2018 14292 14794 14602 02/28/2018 13568 14249 14143 03/31/2018 13438 13963 14120 04/30/2018 13414 14016 13987 05/31/2018 13775 14412 14510 06/30/2018 13847 14506 14566 07/31/2018 14144 14987 14879 08/31/2018 14384 15514 15736 09/30/2018 14186 15539 15669 10/31/2018 12960 14395 14118 11/30/2018 13473 14683 14477 12/31/2018 12325 13317 13163 01/31/2019 13316 14460 14676 02/28/2019 13941 14968 15536 03/31/2019 14044 15187 15746 04/30/2019 14783 15793 16454 05/31/2019 14469 14771 15507 06/30/2019 15197 15809 16596 07/31/2019 15401 16044 16984 08/31/2019 15473 15717 16675 09/30/2019 15792 15993 16485 10/31/2019 16091 16337 16790 11/30/2019 16738 16958 17626 12/31/2019 16622 17447 17832 01/31/2020 16835 17428 17999 02/29/2020 15710 16002 16758 03/31/2020 11596 13801 14259 04/30/2020 13270 15629 16491 05/31/2020 14402 16465 18148 06/30/2020 15036 16841 18573 07/31/2020 15806 17797 20057 08/31/2020 16747 19087 20603 09/30/2020 15841 18392 20314 10/31/2020 14998 17995 20339 11/30/2020 16858 20184 23071 12/31/2020 17535 21092 24178 01/31/2021 17094 20998 24097 02/28/2021 18259 21654 24509 03/31/2021 19880 22431 24041 04/30/2021 20877 23587 25392 05/31/2021 20960 23695 25004 06/30/2021 21313 24279 26703 07/31/2021 21737 24689 26978 08/31/2021 22230 25393 27849 09/30/2021 21475 24254 26500 10/31/2021 22928 25894 28358 11/30/2021 22205 25500 27160 12/31/2021 23067 26504 27255 01/31/2022 21151 24945 23738 02/28/2022 20656 24317 23450 03/31/2022 20934 25105 23826 04/30/2022 19020 22852 21144 05/31/2022 19581 22822 20325 06/30/2022 17912 20912 18806 07/31/2022 19925 22874 21107 08/31/2022 18453 22021 20416 09/30/2022 16105 19979 18683 10/31/2022 17070 21617 20151 11/30/2022 18476 22745 21248 12/31/2022 17303 21414 19972 01/31/2023 19195 22888 21715 02/28/2023 18517 22353 21501 03/31/2023 18065 22951 21797 04/30/2023 18379 23196 21481 05/31/2023 17812 23286 21495 06/30/2023 19803 24876 23156 07/31/2023 20102 25768 23857 08/31/2023 20083 25270 23070 09/30/2023 18612 24067 21946 10/31/2023 17670 23429 20826 11/30/2023 19298 25613 23367 12/31/2023 20910 26972 25139 01/31/2024 20374 27271 25003 02/29/2024 21509 28747 26883 03/31/2024 21837 29674 27526 04/30/2024 19867 28369 25927 05/31/2024 21219 29709 26204 06/30/2024 21306 30629 26641 07/31/2024 24262 31198 26803 08/31/2024 24948 31877 27469 09/30/2024 25320 32537 28384 10/31/2024 24373 32298 28880
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Focus Fund 37.93% 8.66% 9.32% Russell 3000® Index 37.86% 14.60% 12.44% Russell Midcap® Growth Index 38.67% 11.46% 11.19%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 674,729,060
Holdings Count | Holdings	23
Advisory Fees Paid, Amount	$ 5,881,996
Investment Company, Portfolio Turnover	10%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $674,729,060 Number of Holdings 23 Annual Portfolio Turnover 10% Total Advisory Fee $5,881,996
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 18.53% Consumer Discretionary 23.52% Financials 29.77% Health Care 2.58% Industrials 9.48% Information Technology 8.03% Real Estate 7.17% Short-Term Investments and Other 1.08% Liabilities in Excess of Other Assets -0.16% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Focus Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Focus Fund
Class Name	Institutional Class
Trading Symbol	HFCIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $132 1.11%
Expenses Paid, Amount	$ 132
Expense Ratio, Percent	1.11%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund slightly outperformed the Russell 3000® Index (the Fund’s primary benchmark) and slightly underperformed the Russell Midcap® Growth Index. Investment Strategy We implement the Fund’s strategy through a concentrated portfolio of approximately 25 companies that we believe are high-quality businesses with large growth opportunities, excellent management, low tail risk, and discount valuations. We invest with a long-term time horizon and encourage shareholders to do the same. Periods can be influenced by many transitory issues unrelated to the growth in the intrinsic value of the Fund’s holdings. Factors Influencing Performance The biggest contributors to the Fund’s performance relative to the Russell 3000® Index were stock selection in the Communication Services sector, the Fund’s overweighting to the Financials sector, and the Fund’s underweighting to the Health Care sector. The biggest contributors to the Fund’s performance relative to the Russell Midcap® Growth Index were the Fund’s overweighting to the Communication Services sector and the Fund’s underweighting to the Consumer Staples and Health Care sectors. On an individual stock basis, the leading contributors to the Fund’s performance were AST SpaceMobile, Inc. (up 619%), Brookfield Corp. (up 83%), and Applied Materials, Inc. (up 38%). The biggest detractors from the Fund’s performance relative to the Russell 3000® Index were stock selection in the Information Technology and Financials sectors and the Fund’s underweighting to the Informational Technology sector. The biggest detractors from the Fund’s performance relative to the Russell Midcap® Growth Index were stock selection in the Information Technology, Real Estate, and Financials sectors. On an individual stock basis, the leading detractors from the Fund’s performance were Shenandoah Telecommunications Co. (down 41%), Floor & Decor Holdings, Inc. (down 5% since the Fund’s purchase), and CDW Corp. (down 5%).
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Focus Fund Russell 3000® Index Russell Midcap® Growth Index 10/31/2014 250000 250000 250000 11/30/2014 257376 256058 258217 12/31/2014 261880 256056 257485 01/31/2015 253988 248929 253147 02/28/2015 272031 263342 270570 03/31/2015 275862 260665 271333 04/30/2015 272951 261844 269428 05/31/2015 274330 265466 272628 06/30/2015 275249 261025 268237 07/31/2015 282834 265390 272584 08/31/2015 267473 249369 256724 09/30/2015 261228 242102 246806 10/31/2015 280574 261225 262340 11/30/2015 279425 262673 262912 12/31/2015 270382 257281 256970 01/31/2016 255028 242764 237517 02/29/2016 257984 242686 241240 03/31/2016 275987 259773 258458 04/30/2016 276486 261383 258301 05/31/2016 281169 266059 262537 06/30/2016 274758 266606 262497 07/31/2016 286504 277187 275497 08/31/2016 284815 277894 274688 09/30/2016 283165 278331 274551 10/31/2016 277023 272309 263396 11/30/2016 285928 284495 274847 12/31/2016 290803 290047 275802 01/31/2017 293951 295506 284997 02/28/2017 302664 306496 293192 03/31/2017 304199 306705 294817 04/30/2017 304007 309956 299191 05/31/2017 309804 313128 306335 06/30/2017 313987 315954 307243 07/31/2017 317596 321911 312376 08/31/2017 317941 322531 314580 09/30/2017 329034 330397 323475 10/31/2017 334331 337607 332527 11/30/2017 341663 347858 343641 12/31/2017 348133 351335 345492 01/31/2018 361568 369854 365039 02/28/2018 343334 356222 353581 03/31/2018 340187 349071 353004 04/30/2018 339649 350397 349670 05/31/2018 348939 360289 362748 06/30/2018 350858 362645 364150 07/31/2018 358536 374680 371967 08/31/2018 364716 387838 393406 09/30/2018 359764 388480 391733 10/31/2018 328824 359875 352942 11/30/2018 341914 367083 361919 12/31/2018 312904 332919 329079 01/31/2019 338139 361495 366893 02/28/2019 354186 374208 388407 03/31/2019 356845 379672 393647 04/30/2019 375736 394833 411349 05/31/2019 367853 369283 387685 06/30/2019 386465 395220 414911 07/31/2019 391783 401095 424598 08/31/2019 393742 392919 416864 09/30/2019 401952 399815 412117 10/31/2019 409695 408421 419757 11/30/2019 426301 423946 440640 12/31/2019 423474 436187 445802 01/31/2020 428998 435711 449973 02/29/2020 400450 400038 418945 03/31/2020 295652 345025 356463 04/30/2020 338397 390721 412282 05/31/2020 367359 411616 453698 06/30/2020 383723 421026 464332 07/31/2020 403496 444933 501428 08/31/2020 427656 477166 515069 09/30/2020 404683 459792 507857 10/31/2020 383259 449868 508479 11/30/2020 430960 504596 576778 12/31/2020 448383 527297 604447 01/31/2021 437206 524952 602429 02/28/2021 467150 541360 612717 03/31/2021 508832 560764 601030 04/30/2021 534488 589671 634800 05/31/2021 536808 592363 625099 06/30/2021 545946 606970 667577 07/31/2021 557051 617234 674453 08/31/2021 569844 634836 696223 09/30/2021 550655 606352 662504 10/31/2021 588050 647357 708955 11/30/2021 569633 637503 679001 12/31/2021 591953 662607 681382 01/31/2022 543015 623622 593454 02/28/2022 530492 607913 586250 03/31/2022 537825 627632 595662 04/30/2022 488804 571307 528591 05/31/2022 503387 570541 508130 06/30/2022 460628 522810 470146 07/31/2022 512532 571859 527680 08/31/2022 474799 550518 510396 09/30/2022 414491 499469 467076 10/31/2022 439454 540428 503784 11/30/2022 475787 568636 531192 12/31/2022 445709 535341 499310 01/31/2023 494655 572211 542882 02/28/2023 477269 558837 537522 03/31/2023 465835 573780 544927 04/30/2023 473961 579893 537034 05/31/2023 459504 582149 537365 06/30/2023 511001 621902 578899 07/31/2023 518939 644195 596416 08/31/2023 518561 631759 576753 09/30/2023 480765 601666 548658 10/31/2023 456575 585717 520661 11/30/2023 498812 640334 584180 12/31/2023 540690 674298 628466 01/31/2024 526865 681771 625080 02/29/2024 556420 718676 672078 03/31/2024 565120 741858 688149 04/30/2024 514352 709215 648184 05/31/2024 549508 742724 655094 06/30/2024 551892 765717 666036 07/31/2024 628759 779950 670073 08/31/2024 646754 796929 686721 09/30/2024 656526 813414 709604 10/31/2024 632096 807441 722000
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Focus Fund 38.44% 9.06% 9.72% Russell 3000® Index 37.86% 14.60% 12.44% Russell Midcap® Growth Index 38.67% 11.46% 11.19%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 674,729,060
Holdings Count | Holdings	23
Advisory Fees Paid, Amount	$ 5,881,996
Investment Company, Portfolio Turnover	10%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $674,729,060 Number of Holdings 23 Annual Portfolio Turnover 10% Total Advisory Fee $5,881,996
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 18.53% Consumer Discretionary 23.52% Financials 29.77% Health Care 2.58% Industrials 9.48% Information Technology 8.03% Real Estate 7.17% Short-Term Investments and Other 1.08% Liabilities in Excess of Other Assets -0.16% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Cornerstone Mid Cap 30 Fund
Class Name	Investor Class
Trading Symbol	HFMDX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $169 1.33%
Expenses Paid, Amount	$ 169
Expense Ratio, Percent	1.33%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund outperformed both the Russell Midcap® Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in the Consumer Discretionary, Industrials, and Consumer Staples sectors contributed the most to performance. ● Holdings in the Financials, Information Technology, and Real Estate sectors detracted the most from performance. ● Stocks that contributed most to performance included Modine Manufacturing Co., Sprouts Farmers Market, Inc., and Abercrombie & Fitch Co. ● Stocks that detracted most from performance included Par Pacific Holdings, Inc., PBF Energy, Inc., and Insight Enterprises, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Cornerstone Mid Cap 30 Fund Russell Midcap® Index S&P 500® Index 10/31/2014 10000 10000 10000 11/30/2014 10411 10256 10269 12/31/2014 10442 10278 10243 01/31/2015 10191 10117 9936 02/28/2015 10833 10677 10507 03/31/2015 10995 10684 10340 04/30/2015 10967 10587 10440 05/31/2015 11425 10742 10574 06/30/2015 11610 10520 10369 07/31/2015 11961 10598 10586 08/31/2015 11431 10038 9948 09/30/2015 11012 9677 9702 10/31/2015 11235 10277 10520 11/30/2015 10939 10303 10551 12/31/2015 10444 10027 10385 01/31/2016 9892 9370 9869 02/29/2016 10202 9476 9856 03/31/2016 10839 10252 10525 04/30/2016 10349 10360 10566 05/31/2016 10489 10530 10755 06/30/2016 10371 10578 10783 07/31/2016 10867 11061 11181 08/31/2016 10658 11034 11196 09/30/2016 10794 11056 11199 10/31/2016 10349 10705 10994 11/30/2016 11115 11282 11401 12/31/2016 11053 11411 11627 01/31/2017 11194 11686 11847 02/28/2017 11608 12017 12318 03/31/2017 11495 11998 12332 04/30/2017 11608 12090 12459 05/31/2017 11478 12201 12634 06/30/2017 11704 12322 12713 07/31/2017 11835 12503 12974 08/31/2017 11778 12406 13014 09/30/2017 12368 12750 13283 10/31/2017 12730 12963 13593 11/30/2017 13082 13399 14009 12/31/2017 13319 13524 14165 01/31/2018 13353 14033 14976 02/28/2018 12266 13453 14424 03/31/2018 12395 13461 14058 04/30/2018 12719 13441 14112 05/31/2018 13279 13746 14451 06/30/2018 13070 13841 14540 07/31/2018 13130 14186 15081 08/31/2018 13124 14626 15573 09/30/2018 12590 14533 15662 10/31/2018 11389 13325 14591 11/30/2018 11362 13653 14888 12/31/2018 10285 12299 13544 01/31/2019 11400 13625 14629 02/28/2019 11765 14210 15099 03/31/2019 11522 14332 15393 04/30/2019 11728 14878 16016 05/31/2019 10641 13965 14998 06/30/2019 11456 14924 16055 07/31/2019 11428 15137 16286 08/31/2019 10876 14706 16028 09/30/2019 11213 14995 16328 10/31/2019 11250 15153 16681 11/30/2019 11775 15695 17287 12/31/2019 11906 16055 17809 01/31/2020 11887 15926 17802 02/29/2020 10623 14543 16336 03/31/2020 7466 11709 14319 04/30/2020 8936 13390 16154 05/31/2020 9995 14331 16923 06/30/2020 10257 14590 17260 07/31/2020 11353 15446 18233 08/31/2020 12159 15989 19544 09/30/2020 12524 15678 18801 10/31/2020 12430 15778 18301 11/30/2020 13995 17959 20305 12/31/2020 14688 18800 21085 01/31/2021 16028 18751 20872 02/28/2021 17339 19795 21448 03/31/2021 18351 20330 22387 04/30/2021 18585 21367 23582 05/31/2021 19053 21538 23747 06/30/2021 18875 21855 24301 07/31/2021 18688 22023 24878 08/31/2021 18679 22583 25635 09/30/2021 17451 21653 24443 10/31/2021 18529 22941 26155 11/30/2021 18070 22142 25974 12/31/2021 18686 23046 27138 01/31/2022 17790 21348 25734 02/28/2022 18657 21195 24963 03/31/2022 19343 21737 25890 04/30/2022 18838 20063 23632 05/31/2022 19439 20079 23676 06/30/2022 16828 18075 21721 07/31/2022 18638 19859 23724 08/31/2022 19077 19236 22757 09/30/2022 17323 17453 20661 10/31/2022 19849 19002 22334 11/30/2022 20601 20144 23582 12/31/2022 19207 19056 22223 01/31/2023 20720 20638 23619 02/28/2023 21170 20138 23043 03/31/2023 20962 19828 23889 04/30/2023 20189 19724 24262 05/31/2023 20316 19173 24367 06/30/2023 22740 20773 25977 07/31/2023 24367 21597 26812 08/31/2023 23271 20847 26385 09/30/2023 23063 19800 25127 10/31/2023 21839 18811 24599 11/30/2023 23698 20736 26845 12/31/2023 25120 22338 28065 01/31/2024 24942 22020 28536 02/29/2024 27842 23251 30060 03/31/2024 29534 24259 31027 04/30/2024 28300 22949 29760 05/31/2024 31187 23603 31236 06/30/2024 30691 23447 32356 07/31/2024 32841 24552 32750 08/31/2024 32701 25050 33545 09/30/2024 33184 25607 34261 10/31/2024 33680 25469 33950
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Cornerstone Mid Cap 30 Fund 54.22% 24.52% 12.91% Russell Midcap® Index 35.39% 10.94% 9.80% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 1,597,111,530
Holdings Count | Holdings	59	[1]
Advisory Fees Paid, Amount	$ 7,873,052
Investment Company, Portfolio Turnover	94%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $1,597,111,530 Number of Holdings 59¹ Annual Portfolio Turnover 94% Total Advisory Fee $7,873,052 ¹ Due to the timing of the Fund's annual rebalance, the Fund held more than 30 securities at year end.
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 5.37% Consumer Discretionary 27.96% Consumer Staples 7.75% Energy 7.23% Financials 6.52% Industrials 28.50% Information Technology 5.23% Materials 3.77% Real Estate 1.89% Utilities 1.93% Short-Term Investments and Other 3.85% Liabilities in Excess of Other Assets -0.11% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Cornerstone Mid Cap 30 Fund
Class Name	Institutional Class
Trading Symbol	HIMDX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $121 0.95%
Expenses Paid, Amount	$ 121
Expense Ratio, Percent	0.95%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund outperformed both the Russell Midcap® Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in the Consumer Discretionary, Industrials, and Consumer Staples sectors contributed the most to performance. ● Holdings in the Financials, Information Technology, and Real Estate sectors detracted the most from performance. ● Stocks that contributed most to performance included Modine Manufacturing Co., Sprouts Farmers Market, Inc., and Abercrombie & Fitch Co. ● Stocks that detracted most from performance included Par Pacific Holdings, Inc., PBF Energy, Inc., and Insight Enterprises, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Cornerstone Mid Cap 30 Fund Russell Midcap® Index S&P 500® Index 10/31/2014 250000 250000 250000 11/30/2014 260331 256397 256724 12/31/2014 261280 256940 256077 01/31/2015 254977 252931 248390 02/28/2015 271144 266935 262665 03/31/2015 275118 267095 258511 04/30/2015 274570 264667 260991 05/31/2015 286079 268544 264347 06/30/2015 290737 262990 259230 07/31/2015 299643 264941 264661 08/31/2015 286353 250960 248693 09/30/2015 275940 241925 242540 10/31/2015 281557 256923 262999 11/30/2015 274296 257578 263781 12/31/2015 261873 250674 259621 01/31/2016 248024 234250 246737 02/29/2016 255918 236898 246404 03/31/2016 271982 256301 263120 04/30/2016 259795 259011 264140 05/31/2016 263396 263258 268883 06/30/2016 260488 264457 269580 07/31/2016 273090 276531 279519 08/31/2016 267966 275840 279912 09/30/2016 271428 276398 279965 10/31/2016 260349 267627 274858 11/30/2016 279737 282060 285037 12/31/2016 278113 285263 290671 01/31/2017 281875 292147 296184 02/28/2017 292325 300414 307944 03/31/2017 289538 299945 308304 04/30/2017 292464 302255 311470 05/31/2017 289399 305016 315853 06/30/2017 295112 308050 317824 07/31/2017 298456 312586 324360 08/31/2017 297062 310156 325353 09/30/2017 312111 318750 332064 10/31/2017 321446 324069 339813 11/30/2017 330363 334973 350235 12/31/2017 336416 338088 354129 01/31/2018 337413 350815 374404 02/28/2018 310015 336324 360605 03/31/2018 313502 336533 351441 04/30/2018 321638 336021 352789 05/31/2018 335918 343648 361285 06/30/2018 330605 346020 363509 07/31/2018 332431 354640 377036 08/31/2018 332265 365656 389322 09/30/2018 318981 363313 391538 10/31/2018 288594 333127 364776 11/30/2018 287930 341315 372210 12/31/2018 260913 307463 338603 01/31/2019 289163 340630 365737 02/28/2019 298350 355261 377480 03/31/2019 292378 358307 384815 04/30/2019 297661 371941 400396 05/31/2019 270100 349117 374952 06/30/2019 291000 373097 401377 07/31/2019 290311 378424 407146 08/31/2019 276531 367645 400696 09/30/2019 284799 374886 408194 10/31/2019 286177 378828 417035 11/30/2019 299498 392366 432173 12/31/2019 302714 401369 445217 01/31/2020 302484 398151 445042 02/29/2020 270329 363567 408407 03/31/2020 190172 292713 357963 04/30/2020 227609 334752 403852 05/31/2020 254711 358285 423087 06/30/2020 261372 364740 431501 07/31/2020 289392 386157 455831 08/31/2020 309834 399734 488596 09/30/2020 319480 391952 470031 10/31/2020 317183 394451 457531 11/30/2020 357147 448972 507614 12/31/2020 374832 470006 527131 01/31/2021 409284 468763 521809 02/28/2021 442816 494869 536198 03/31/2021 468999 508260 559681 04/30/2021 475201 534163 589551 05/31/2021 487144 538450 593669 06/30/2021 482780 546375 607528 07/31/2021 478186 550579 621959 08/31/2021 477957 564576 640871 09/30/2021 446721 541316 611064 10/31/2021 474512 573513 653876 11/30/2021 463028 553543 649345 12/31/2021 478871 576152 678446 01/31/2022 455978 533707 643339 02/28/2022 478170 529868 624076 03/31/2022 496157 543437 647248 04/30/2022 483309 501574 590807 05/31/2022 498960 501974 591891 06/30/2022 431918 451873 543034 07/31/2022 478404 496479 593104 08/31/2022 490083 480903 568916 09/30/2022 444999 436333 516520 10/31/2022 510173 475059 558338 11/30/2022 529561 503609 589540 12/31/2022 494071 476391 555574 01/31/2023 533122 515952 590483 02/28/2023 544724 503438 576076 03/31/2023 539630 495712 597226 04/30/2023 519822 493094 606548 05/31/2023 523218 479317 609184 06/30/2023 585755 519313 649436 07/31/2023 627918 539913 670299 08/31/2023 599903 521187 659627 09/30/2023 594527 495003 628177 10/31/2023 563400 470277 614969 11/30/2023 611505 518391 671131 12/31/2023 648559 558460 701621 01/31/2024 643882 550508 713411 02/29/2024 719340 581264 751504 03/31/2024 762993 606483 775684 04/30/2024 731188 573722 744001 05/31/2024 806022 590085 780892 06/30/2024 793550 586177 808912 07/31/2024 849363 613803 818759 08/31/2024 846245 626240 838619 09/30/2024 858718 640178 856530 10/31/2024 872125 636730 848762
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Cornerstone Mid Cap 30 Fund 54.74% 24.97% 13.31% Russell Midcap® Index 35.39% 10.94% 9.80% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 1,597,111,530
Holdings Count | Holdings	59	[2]
Advisory Fees Paid, Amount	$ 7,873,052
Investment Company, Portfolio Turnover	94%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $1,597,111,530 Number of Holdings 59¹ Annual Portfolio Turnover 94% Total Advisory Fee $7,873,052 ¹ Due to the timing of the Fund's annual rebalance, the Fund held more than 30 securities at year end.
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 5.37% Consumer Discretionary 27.96% Consumer Staples 7.75% Energy 7.23% Financials 6.52% Industrials 28.50% Information Technology 5.23% Materials 3.77% Real Estate 1.89% Utilities 1.93% Short-Term Investments and Other 3.85% Liabilities in Excess of Other Assets -0.11% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Cornerstone Large Growth Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Cornerstone Large Growth Fund
Class Name	Investor Class
Trading Symbol	HFLGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $142 1.27%
Expenses Paid, Amount	$ 142
Expense Ratio, Percent	1.27%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the Russell 1000® Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in the Consumer Discretionary, Industrials, and Materials sectors contributed the most to performance. ● Holdings in the Information Technology, Financials, and Communications Services sectors detracted the most from performance. ● Stocks that contributed most to performance included Dell Technologies Inc., Pulte Group, Inc., and Builders FirstSource, Inc. ● Stocks that detracted most from performance included Dollar General Corp., Lamb Weston Holdings, Inc., and APA Corp.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Cornerstone Large Growth Fund Russell 1000® Index S&P 500® Index 10/31/2014 10000 10000 10000 11/30/2014 10323 10262 10269 12/31/2014 10407 10238 10243 01/31/2015 10181 9957 9936 02/28/2015 10757 10532 10507 03/31/2015 10648 10401 10340 04/30/2015 10640 10475 10440 05/31/2015 10648 10612 10574 06/30/2015 10368 10413 10369 07/31/2015 10368 10613 10586 08/31/2015 9761 9975 9948 09/30/2015 9395 9702 9702 10/31/2015 10111 10486 10520 11/30/2015 10080 10521 10551 12/31/2015 9720 10332 10385 01/31/2016 9397 9776 9869 02/29/2016 9690 9772 9856 03/31/2016 10306 10453 10525 04/30/2016 9942 10510 10566 05/31/2016 9690 10694 10755 06/30/2016 9518 10718 10783 07/31/2016 10134 11127 11181 08/31/2016 10276 11141 11196 09/30/2016 10387 11150 11199 10/31/2016 10377 10933 10994 11/30/2016 11205 11364 11401 12/31/2016 11148 11577 11627 01/31/2017 11209 11810 11847 02/28/2017 11567 12267 12318 03/31/2017 11556 12275 12332 04/30/2017 11597 12405 12459 05/31/2017 11740 12563 12634 06/30/2017 11843 12651 12713 07/31/2017 11873 12901 12974 08/31/2017 11638 12942 13014 09/30/2017 12057 13217 13283 10/31/2017 12006 13520 13593 11/30/2017 12742 13933 14009 12/31/2017 13052 14088 14165 01/31/2018 13765 14861 14976 02/28/2018 13296 14316 14424 03/31/2018 12977 13991 14058 04/30/2018 12711 14038 14112 05/31/2018 12892 14397 14451 06/30/2018 12945 14490 14540 07/31/2018 13392 14990 15081 08/31/2018 13754 15506 15573 09/30/2018 13701 15565 15662 10/31/2018 13030 14464 14591 11/30/2018 13339 14758 14888 12/31/2018 11879 13414 13544 01/31/2019 12879 14538 14629 02/28/2019 13173 15030 15099 03/31/2019 13199 15292 15393 04/30/2019 13719 15910 16016 05/31/2019 12306 14896 14998 06/30/2019 13399 15942 16055 07/31/2019 13813 16189 16286 08/31/2019 13253 15893 16028 09/30/2019 13746 16168 16328 10/31/2019 14053 16511 16681 11/30/2019 14732 17135 17287 12/31/2019 15149 17629 17809 01/31/2020 14562 17649 17802 02/29/2020 13100 16206 16336 03/31/2020 10778 14065 14319 04/30/2020 12226 15923 16154 05/31/2020 12895 16763 16923 06/30/2020 13196 17134 17260 07/31/2020 13934 18137 18233 08/31/2020 14767 19469 19544 09/30/2020 14494 18757 18801 10/31/2020 13947 18305 18301 11/30/2020 15559 20460 20305 12/31/2020 15981 21325 21085 01/31/2021 16096 21150 20872 02/28/2021 17290 21763 21448 03/31/2021 19088 22586 22387 04/30/2021 19620 23802 23582 05/31/2021 19793 23915 23747 06/30/2021 19936 24514 24301 07/31/2021 20310 25023 24878 08/31/2021 20670 25748 25635 09/30/2021 19577 24565 24443 10/31/2021 20641 26269 26155 11/30/2021 20282 25917 25974 12/31/2021 21519 26967 27138 01/31/2022 20447 25446 25734 02/28/2022 20217 24748 24963 03/31/2022 20728 25583 25890 04/30/2022 19359 23303 23632 05/31/2022 19326 23267 23676 06/30/2022 16754 21319 21721 07/31/2022 18370 23304 23724 08/31/2022 17793 22409 22757 09/30/2022 16061 20336 20661 10/31/2022 18007 21967 22334 11/30/2022 19557 23155 23582 12/31/2022 18655 21809 22223 01/31/2023 20379 23271 23619 02/28/2023 19713 22717 23043 03/31/2023 19458 23436 23889 04/30/2023 19223 23726 24262 05/31/2023 18773 23837 24367 06/30/2023 20811 25447 25977 07/31/2023 22124 26322 26812 08/31/2023 21516 25861 26385 09/30/2023 20713 24646 25127 10/31/2023 19713 24050 24599 11/30/2023 21183 26296 26845 12/31/2023 22705 27595 28065 01/31/2024 22339 27979 28536 02/29/2024 23500 29490 30060 03/31/2024 25169 30436 31027 04/30/2024 23846 29141 29760 05/31/2024 24111 30513 31236 06/30/2024 23581 31523 32356 07/31/2024 24559 31981 32750 08/31/2024 24599 32740 33545 09/30/2024 25027 33440 34261 10/31/2024 24314 33206 33950
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Cornerstone Large Growth Fund 23.34% 11.59% 9.29% Russell 1000® Index 38.07% 15.00% 12.75% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 145,162,717
Holdings Count | Holdings	51
Advisory Fees Paid, Amount	$ 1,084,833
Investment Company, Portfolio Turnover	54%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $145,162,717 Number of Holdings 51 Annual Portfolio Turnover 54% Total Advisory Fee $1,084,833
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 2.07% Consumer Discretionary 22.60% Consumer Staples 13.24% Energy 14.70% Financials 2.22% Health Care 6.41% Industrials 18.82% Information Technology 13.80% Materials 5.54% Short-Term Investments and Other 0.81% Liabilities in Excess of Other Assets -0.06% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Cornerstone Large Growth Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Cornerstone Large Growth Fund
Class Name	Institutional Class
Trading Symbol	HILGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $112 1.00%
Expenses Paid, Amount	$ 112
Expense Ratio, Percent	1%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the Russell 1000® Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in the Consumer Discretionary, Industrials, and Materials sectors contributed the most to performance. ● Holdings in the Information Technology, Financials, and Communications Services sectors detracted the most from performance. ● Stocks that contributed most to performance included Dell Technologies Inc., Pulte Group, Inc., and Builders FirstSource, Inc. ● Stocks that detracted most from performance included Dollar General Corp., Lamb Weston Holdings, Inc., and APA Corp.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Cornerstone Large Growth Fund Russell 1000® Index S&P 500® Index 10/31/2014 250000 250000 250000 11/30/2014 258007 256545 256724 12/31/2014 260129 255948 256077 01/31/2015 254721 248917 248390 02/28/2015 269012 263300 262665 03/31/2015 266308 260021 258511 04/30/2015 266115 261867 260991 05/31/2015 266308 265293 264347 06/30/2015 259356 260316 259230 07/31/2015 259356 265334 264661 08/31/2015 244293 249373 248693 09/30/2015 235023 242538 242540 10/31/2015 252983 262162 262999 11/30/2015 252211 263028 263781 12/31/2015 243300 258296 259621 01/31/2016 235265 244393 246737 02/29/2016 242547 244309 246404 03/31/2016 258114 261328 263120 04/30/2016 249075 262749 264140 05/31/2016 243049 267351 268883 06/30/2016 238530 267956 269580 07/31/2016 254097 278164 279519 08/31/2016 257612 278533 279912 09/30/2016 260374 278754 279965 10/31/2016 260374 273318 274858 11/30/2016 280963 284093 285037 12/31/2016 279907 289430 290671 01/31/2017 281433 295250 296184 02/28/2017 290594 306679 307944 03/31/2017 290085 306873 308304 04/30/2017 291357 310117 311470 05/31/2017 295174 314075 315853 06/30/2017 297719 316268 317824 07/31/2017 298482 322531 324360 08/31/2017 292630 323540 325353 09/30/2017 303062 330430 332064 10/31/2017 302045 338008 339813 11/30/2017 320620 348316 350235 12/31/2017 328421 352199 354129 01/31/2018 346210 371533 374404 02/28/2018 334528 357893 360605 03/31/2018 326829 349769 351441 04/30/2018 319926 350958 352789 05/31/2018 324970 359917 361285 06/30/2018 326032 362244 363509 07/31/2018 337448 374746 377036 08/31/2018 346741 387658 389322 09/30/2018 345413 389130 391538 10/31/2018 328687 361594 364776 11/30/2018 336386 368953 372210 12/31/2018 299994 335350 338603 01/31/2019 325021 363453 365737 02/28/2019 332696 375759 377480 03/31/2019 333364 382301 384815 04/30/2019 346712 397740 400396 05/31/2019 311006 372394 374952 06/30/2019 338703 398538 401377 07/31/2019 349047 404727 407146 08/31/2019 335032 397314 400696 09/30/2019 347713 404201 408194 10/31/2019 355388 412767 417035 11/30/2019 372740 428367 432173 12/31/2019 383440 440737 445217 01/31/2020 368363 441213 445042 02/29/2020 331698 405158 408407 03/31/2020 273102 351617 357963 04/30/2020 309767 398080 403852 05/31/2020 326901 419084 423087 06/30/2020 334439 428351 431501 07/31/2020 353286 453434 455831 08/31/2020 374531 486715 488596 09/30/2020 367677 468926 470031 10/31/2020 353971 457618 457531 11/30/2020 394748 511506 507614 12/31/2020 405551 533130 527131 01/31/2021 408807 528739 521809 02/28/2021 438834 544063 536198 03/31/2021 484780 564652 559681 04/30/2021 498527 595047 589551 05/31/2021 503230 597872 593669 06/30/2021 506848 612853 607528 07/31/2021 516254 625584 621959 08/31/2021 525661 643690 640871 09/30/2021 497804 614123 611064 10/31/2021 524937 656735 653876 11/30/2021 515893 647925 649345 12/31/2021 547750 674170 678446 01/31/2022 520736 636160 643339 02/28/2022 514503 618703 624076 03/31/2022 527802 639581 647248 04/30/2022 493307 582568 590807 05/31/2022 492476 581683 591891 06/30/2022 426813 532967 543034 07/31/2022 468372 582607 593104 08/31/2022 453826 560237 568916 09/30/2022 409773 508400 516520 10/31/2022 459229 549174 558338 11/30/2022 499126 578883 589540 12/31/2022 476222 545222 555574 01/31/2023 520326 581776 590483 02/28/2023 503478 567932 576076 03/31/2023 497035 585898 597226 04/30/2023 491089 593158 606548 05/31/2023 479691 595921 609184 06/30/2023 531724 636168 649436 07/31/2023 565421 658044 670299 08/31/2023 550555 646533 659627 09/30/2023 529742 616149 628177 10/31/2023 504469 601257 614969 11/30/2023 542130 657411 671131 12/31/2023 581295 689865 701621 01/31/2024 572002 699486 713411 02/29/2024 601945 737259 751504 03/31/2024 644277 760894 775684 04/30/2024 610721 728516 744001 05/31/2024 617948 762821 780892 06/30/2024 604526 788068 808912 07/31/2024 629306 799537 818759 08/31/2024 630338 818489 838619 09/30/2024 641696 835989 856530 10/31/2024 623627 830148 848762
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Cornerstone Large Growth Fund 23.62% 11.90% 9.57% Russell 1000® Index 38.07% 15.00% 12.75% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 145,162,717
Holdings Count | Holdings	51
Advisory Fees Paid, Amount	$ 1,084,833
Investment Company, Portfolio Turnover	54%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $145,162,717 Number of Holdings 51 Annual Portfolio Turnover 54% Total Advisory Fee $1,084,833
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 2.07% Consumer Discretionary 22.60% Consumer Staples 13.24% Energy 14.70% Financials 2.22% Health Care 6.41% Industrials 18.82% Information Technology 13.80% Materials 5.54% Short-Term Investments and Other 0.81% Liabilities in Excess of Other Assets -0.06% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Cornerstone Value Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Cornerstone Value Fund
Class Name	Investor Class
Trading Symbol	HFCVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $136 1.22%
Expenses Paid, Amount	$ 136
Expense Ratio, Percent	1.22%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the Russell 1000® Value Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in the Consumer Staples, Energy, and Communication Services sectors contributed the most to performance. ● Holdings in Industrials, Utilities, and Real Estate sectors detracted the most from performance. ● Stocks that contributed most to performance included Manulife Financial Corp., Wells Fargo & Co., and JPMorgan Chase & Co. ● Stocks that detracted most from performance included Equinor ASA, BP PLC, and CVS Health Corp.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Cornerstone Value Fund Russell 1000® Value Index S&P 500® Index 10/31/2014 10000 10000 10000 11/30/2014 10255 10205 10269 12/31/2014 10112 10267 10243 01/31/2015 9790 9857 9936 02/28/2015 10195 10334 10507 03/31/2015 9956 10193 10340 04/30/2015 10367 10289 10440 05/31/2015 10178 10412 10574 06/30/2015 9945 10204 10369 07/31/2015 9795 10249 10586 08/31/2015 9307 9639 9948 09/30/2015 8990 9348 9702 10/31/2015 9823 10053 10520 11/30/2015 9768 10091 10551 12/31/2015 9468 9874 10385 01/31/2016 9092 9364 9869 02/29/2016 9240 9362 9856 03/31/2016 9992 10036 10525 04/30/2016 10117 10247 10566 05/31/2016 10054 10406 10755 06/30/2016 10088 10496 10783 07/31/2016 10493 10801 11181 08/31/2016 10527 10884 11196 09/30/2016 10538 10861 11199 10/31/2016 10453 10693 10994 11/30/2016 10937 11304 11401 12/31/2016 11102 11587 11627 01/31/2017 11323 11669 11847 02/28/2017 11579 12089 12318 03/31/2017 11556 11965 12332 04/30/2017 11492 11943 12459 05/31/2017 11567 11931 12634 06/30/2017 11777 12126 12713 07/31/2017 12033 12287 12974 08/31/2017 11864 12144 13014 09/30/2017 12411 12504 13283 10/31/2017 12505 12595 13593 11/30/2017 12825 12980 14009 12/31/2017 13229 13170 14165 01/31/2018 13820 13679 14976 02/28/2018 12940 13026 14424 03/31/2018 12846 12797 14058 04/30/2018 13061 12839 14112 05/31/2018 13202 12915 14451 06/30/2018 13188 12947 14540 07/31/2018 13638 13460 15081 08/31/2018 13665 13659 15573 09/30/2018 13732 13686 15662 10/31/2018 12960 12977 14591 11/30/2018 13128 13364 14888 12/31/2018 11993 12081 13544 01/31/2019 12854 13021 14629 02/28/2019 13088 13437 15099 03/31/2019 13190 13523 15393 04/30/2019 13566 14003 16016 05/31/2019 12478 13102 14998 06/30/2019 13268 14043 16055 07/31/2019 13307 14159 16286 08/31/2019 12963 13743 16028 09/30/2019 13472 14233 16328 10/31/2019 13636 14432 16681 11/30/2019 14066 14878 17287 12/31/2019 14487 15288 17809 01/31/2020 13719 14959 17802 02/29/2020 12409 13510 16336 03/31/2020 10373 11201 14319 04/30/2020 11332 12460 16154 05/31/2020 11549 12887 16923 06/30/2020 11649 12802 17260 07/31/2020 11833 13308 18233 08/31/2020 12317 13858 19544 09/30/2020 11700 13518 18801 10/31/2020 11424 13340 18301 11/30/2020 13268 15135 20305 12/31/2020 13562 15715 21085 01/31/2021 13605 15571 20872 02/28/2021 14453 16512 21448 03/31/2021 15574 17484 22387 04/30/2021 15874 18183 23582 05/31/2021 16508 18607 23747 06/30/2021 16456 18394 24301 07/31/2021 16242 18541 24878 08/31/2021 16430 18909 25635 09/30/2021 16148 18251 24443 10/31/2021 16773 19178 26155 11/30/2021 16388 18502 25974 12/31/2021 17618 19669 27138 01/31/2022 18283 19211 25734 02/28/2022 18184 18988 24963 03/31/2022 18651 19524 25890 04/30/2022 18094 18423 23632 05/31/2022 19190 18781 23676 06/30/2022 17466 17140 21721 07/31/2022 17861 18276 23724 08/31/2022 17466 17732 22757 09/30/2022 16083 16177 20661 10/31/2022 18229 17836 22334 11/30/2022 19351 18950 23582 12/31/2022 18698 18186 22223 01/31/2023 19232 19129 23619 02/28/2023 18618 18454 23043 03/31/2023 18539 18369 23889 04/30/2023 18985 18646 24262 05/31/2023 17816 17927 24367 06/30/2023 18886 19118 25977 07/31/2023 19559 19790 26812 08/31/2023 19015 19256 26385 09/30/2023 18708 18513 25127 10/31/2023 17965 17860 24599 11/30/2023 18945 19207 26845 12/31/2023 19785 20271 28065 01/31/2024 19836 20292 28536 02/29/2024 19928 21041 30060 03/31/2024 20954 22092 31027 04/30/2024 20513 21149 29760 05/31/2024 21159 21819 31236 06/30/2024 20851 21614 32356 07/31/2024 21682 22719 32750 08/31/2024 22359 23328 33545 09/30/2024 22308 23652 34261 10/31/2024 22164 23392 33950
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Cornerstone Value Fund 23.38% 10.20% 8.28% Russell 1000® Value Index 30.98% 10.14% 8.87% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 281,962,897
Holdings Count | Holdings	50
Advisory Fees Paid, Amount	$ 2,022,870
Investment Company, Portfolio Turnover	22%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $281,962,897 Number of Holdings 50 Annual Portfolio Turnover 22% Total Advisory Fee $2,022,870
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 7.68% Consumer Discretionary 3.44% Consumer Staples 20.10% Energy 19.86% Financials 19.76% Health Care 15.91% Industrials 2.53% Information Technology 8.52% Short-Term Investments and Other 2.06% Other Assets in Excess of Liabilities 0.14% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Cornerstone Value Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Cornerstone Value Fund
Class Name	Institutional Class
Trading Symbol	HICVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $110 0.98%
Expenses Paid, Amount	$ 110
Expense Ratio, Percent	0.98%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the Russell 1000® Value Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in the Consumer Staples, Energy, and Communication Services sectors contributed the most to performance. ● Holdings in Industrials, Utilities, and Real Estate sectors detracted the most from performance. ● Stocks that contributed most to performance included Manulife Financial Corp., Wells Fargo & Co., and JPMorgan Chase & Co. ● Stocks that detracted most from performance included Equinor ASA, BP PLC, and CVS Health Corp.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Cornerstone Value Fund Russell 1000® Value Index S&P 500® Index 10/31/2014 250000 250000 250000 11/30/2014 256382 255119 256724 12/31/2014 252943 256684 256077 01/31/2015 244878 246423 248390 02/28/2015 255168 258348 262665 03/31/2015 249050 254831 258511 04/30/2015 259340 257213 260991 05/31/2015 254612 260304 264347 06/30/2015 248772 255107 259230 07/31/2015 245017 256225 264661 08/31/2015 232780 240965 248693 09/30/2015 224854 233691 242540 10/31/2015 245712 251323 262999 11/30/2015 244461 252285 263781 12/31/2015 236853 246860 259621 01/31/2016 227590 234104 246737 02/29/2016 231295 234045 246404 03/31/2016 250249 250904 263120 04/30/2016 253384 256175 264140 05/31/2016 251959 260154 268883 06/30/2016 252956 262403 269580 07/31/2016 263075 270022 279519 08/31/2016 264072 272104 279912 09/30/2016 264357 271537 279965 10/31/2016 262220 267335 274858 11/30/2016 274476 282603 285037 12/31/2016 278566 289666 290671 01/31/2017 284266 291730 296184 02/28/2017 290697 302213 307944 03/31/2017 290259 299134 308304 04/30/2017 288651 298573 311470 05/31/2017 290697 298280 315853 06/30/2017 296105 303156 317824 07/31/2017 302535 307185 324360 08/31/2017 298297 303607 325353 09/30/2017 312182 312599 332064 10/31/2017 314520 314869 339813 11/30/2017 322558 324511 350235 12/31/2017 332823 329248 354129 01/31/2018 347697 341977 374404 02/28/2018 325723 325647 360605 03/31/2018 323357 319919 351441 04/30/2018 328766 320975 352789 05/31/2018 332485 322880 361285 06/30/2018 332316 323680 363509 07/31/2018 343641 336491 377036 08/31/2018 344317 341464 389322 09/30/2018 346176 342142 391538 10/31/2018 326738 324425 364776 11/30/2018 330963 334111 372210 12/31/2018 302468 302028 338603 01/31/2019 324172 325536 365737 02/28/2019 330091 335937 377480 03/31/2019 332853 338073 384815 04/30/2019 342521 350065 400396 05/31/2019 314898 327557 374952 06/30/2019 334826 351070 401377 07/31/2019 336010 353980 407146 08/31/2019 327526 343572 400696 09/30/2019 340153 355829 408194 10/31/2019 344297 360803 417035 11/30/2019 355148 371958 432173 12/31/2019 365926 382190 445217 01/31/2020 346533 373968 445042 02/29/2020 313651 337751 408407 03/31/2020 262219 280031 357963 04/30/2020 286459 311512 403852 05/31/2020 291940 322187 423087 06/30/2020 294680 320049 431501 07/31/2020 299317 332702 455831 08/31/2020 311543 346459 488596 09/30/2020 295945 337949 470031 10/31/2020 288989 333507 457531 11/30/2020 335783 378368 507614 12/31/2020 343246 392875 527131 01/31/2021 344329 389277 521809 02/28/2021 365999 412802 536198 03/31/2021 394603 437093 559681 04/30/2021 402187 454573 589551 05/31/2021 418223 465185 593669 06/30/2021 416923 459857 607528 07/31/2021 411505 463533 621959 08/31/2021 416706 472725 640871 09/30/2021 409338 456271 611064 10/31/2021 425374 479439 653876 11/30/2021 415622 462544 649345 12/31/2021 446917 491724 678446 01/31/2022 464001 480270 643339 02/28/2022 461495 474696 624076 03/31/2022 473568 488097 647248 04/30/2022 459445 460566 590807 05/31/2022 487235 469519 591891 06/30/2022 443728 428496 543034 07/31/2022 453750 456911 593104 08/31/2022 443956 443297 568916 09/30/2022 408649 404426 516520 10/31/2022 463317 445892 558338 11/30/2022 492019 473756 589540 12/31/2022 475365 454658 555574 01/31/2023 488961 478219 590483 02/28/2023 473351 461357 576076 03/31/2023 471588 459233 597226 04/30/2023 482919 466152 606548 05/31/2023 453208 448173 609184 06/30/2023 480653 477944 649436 07/31/2023 497774 494751 670299 08/31/2023 484177 481395 659627 09/30/2023 476372 462818 628177 10/31/2023 457489 446489 614969 11/30/2023 482415 480176 671131 12/31/2023 503882 506774 701621 01/31/2024 505448 507299 713411 02/29/2024 507796 526013 751504 03/31/2024 534152 552311 775684 04/30/2024 522931 528719 744001 05/31/2024 539370 545479 780892 06/30/2024 531803 540348 808912 07/31/2024 552939 567972 818759 08/31/2024 570423 583208 838619 09/30/2024 569379 591302 856530 10/31/2024 565726 584795 848762
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Cornerstone Value Fund 23.66% 10.44% 8.51% Russell 1000® Value 30.98% 10.14% 8.87% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 281,962,897
Holdings Count | Holdings	50
Advisory Fees Paid, Amount	$ 2,022,870
Investment Company, Portfolio Turnover	22%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $281,962,897 Number of Holdings 50 Annual Portfolio Turnover 22% Total Advisory Fee $2,022,870
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 7.68% Consumer Discretionary 3.44% Consumer Staples 20.10% Energy 19.86% Financials 19.76% Health Care 15.91% Industrials 2.53% Information Technology 8.52% Short-Term Investments and Other 2.06% Other Assets in Excess of Liabilities 0.14% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Total Return Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Total Return Fund
Class Name	Investor Class
Trading Symbol	HDOGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $390 3.62%
Expenses Paid, Amount	$ 390
Expense Ratio, Percent	3.62%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the 75/25 Blended DJIA/Treasury Index (the Fund’s primary benchmark) and the Dow Jones Industrial Average. Factors Influencing Performance ● Holdings in the Information Technology, Industrials, and Financials sectors contributed the most to performance. ● Holdings in the Consumer Staples sector detracted from performance. ● Stocks that contributed most to performance included 3M Company, International Business Machines Corporation, and The Goldman Sachs Group, Inc. ● Stocks that detracted most from performance included Walgreens Boots Alliance, Inc., Solventum Corporation, and Merck & Co., Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Total Return Fund Dow Jones Industrial Average 75/25 Blended DJIA/Treasury Index 10/31/2014 10000 10000 10000 11/30/2014 10216 10286 10215 12/31/2014 10027 10298 10224 01/31/2015 9815 9929 9949 02/28/2015 10238 10526 10398 03/31/2015 10010 10332 10253 04/30/2015 10222 10378 10288 05/31/2015 10201 10518 10392 06/30/2015 9970 10301 10232 07/31/2015 10034 10355 10272 08/31/2015 9572 9714 9795 09/30/2015 9452 9582 9695 10/31/2015 10122 10406 10320 11/30/2015 10101 10479 10375 12/31/2015 10126 10320 10258 01/31/2016 9993 9764 9843 02/29/2016 10072 9837 9899 03/31/2016 10597 10547 10436 04/30/2016 10683 10612 10485 05/31/2016 10778 10664 10524 06/30/2016 11030 10765 10599 07/31/2016 11172 11081 10834 08/31/2016 11125 11110 10855 09/30/2016 11198 11064 10823 10/31/2016 10953 10977 10760 11/30/2016 11269 11622 11234 12/31/2016 11434 12022 11526 01/31/2017 11393 12097 11581 02/28/2017 11708 12722 12031 03/31/2017 11584 12646 11978 04/30/2017 11626 12829 12110 05/31/2017 11601 12921 12176 06/30/2017 11643 13146 12338 07/31/2017 11928 13498 12588 08/31/2017 11962 13586 12653 09/30/2017 12261 13880 12861 10/31/2017 12320 14497 13292 11/30/2017 12556 15111 13717 12/31/2017 12711 15402 13919 01/31/2018 12936 16307 14537 02/28/2018 12383 15661 14108 03/31/2018 12316 15099 13733 04/30/2018 12486 15151 13773 05/31/2018 12486 15364 13924 06/30/2018 12592 15290 13879 07/31/2018 12849 16029 14388 08/31/2018 13029 16439 14670 09/30/2018 13211 16762 14893 10/31/2018 12935 15927 14342 11/30/2018 13411 16262 14576 12/31/2018 12725 14866 13644 01/31/2019 13119 15950 14397 02/28/2019 13513 16593 14839 03/31/2019 13741 16622 14866 04/30/2019 13800 17064 15170 05/31/2019 13345 15986 14460 06/30/2019 13895 17155 15261 07/31/2019 13965 17346 15395 08/31/2019 13676 17116 15251 09/30/2019 13921 17468 15492 10/31/2019 13961 17570 15568 11/30/2019 14041 18292 16052 12/31/2019 14323 18633 16282 01/31/2020 13712 18468 16179 02/29/2020 12740 16667 15002 03/31/2020 11763 14397 13481 04/30/2020 12754 16012 14615 05/31/2020 12986 16758 15126 06/30/2020 12696 17062 15332 07/31/2020 12818 17490 15621 08/31/2020 12930 18875 16549 09/30/2020 12593 18464 16280 10/31/2020 12235 17630 15729 11/30/2020 13400 19771 17161 12/31/2020 13632 20445 17601 01/31/2021 13632 20046 17343 02/28/2021 13969 20734 17790 03/31/2021 14881 22140 18695 04/30/2021 14859 22756 19086 05/31/2021 15154 23259 19402 06/30/2021 15071 23263 19405 07/31/2021 14928 23575 19600 08/31/2021 15049 23928 19820 09/30/2021 14606 22924 19196 10/31/2021 14892 24282 20049 11/30/2021 14441 23432 19523 12/31/2021 15241 24727 20333 01/31/2022 15362 23926 19839 02/28/2022 15175 23138 19349 03/31/2022 15553 23713 19711 04/30/2022 15364 22569 18999 05/31/2022 16018 22643 19049 06/30/2022 14966 21157 18112 07/31/2022 15122 22600 19041 08/31/2022 14577 21759 18517 09/30/2022 13717 19852 17312 10/31/2022 15059 22645 19145 11/30/2022 15864 24013 20029 12/31/2022 15454 23031 19432 01/31/2023 15642 23705 19874 02/28/2023 15206 22770 19303 03/31/2023 15477 23245 19625 04/30/2023 15453 23843 20020 05/31/2023 14906 23088 19564 06/30/2023 15360 24167 20273 07/31/2023 15887 24999 20817 08/31/2023 15791 24497 20526 09/30/2023 15344 23660 20024 10/31/2023 15138 23362 19857 11/30/2023 15887 25501 21243 12/31/2023 16693 26757 22053 01/31/2024 16718 27108 22294 02/29/2024 16604 27786 22735 03/31/2024 17097 28399 23137 04/30/2024 16649 27003 22308 05/31/2024 16982 27699 22767 06/30/2024 16715 28039 23000 07/31/2024 17541 29305 23804 08/31/2024 17735 29900 24196 09/30/2024 17916 30485 24577 10/31/2024 17487 30102 24369
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Total Return Fund 15.52% 4.61% 5.75% 75/25 Blended DJIA/Treasury Index 22.72% 9.38% 9.32% Dow Jones Industrial Average 28.85% 11.37% 11.65%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 49,044,336
Holdings Count | Holdings	15
Advisory Fees Paid, Amount	$ 299,567
Investment Company, Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $49,044,336 Number of Holdings 15 Annual Portfolio Turnover 32% Total Advisory Fee $299,567
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 7.44% Consumer Staples 8.92% Energy 6.92% Financials 4.75% Health Care 13.97% Industrials 8.17% Information Technology 12.35% Materials 6.36% Money Market Funds 2.47% U.S. Treasury Bills 72.90% Liabilities in Excess of Other Assets -44.32% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Equity and Income Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Equity and Income Fund
Class Name	Investor Class
Trading Symbol	HEIFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $171 1.55%
Expenses Paid, Amount	$ 171
Expense Ratio, Percent	1.55%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed the S&P 500® Index. Factors Influencing Performance Equities Fixed Income
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Equity and Income Fund S&P 500® Index 10/31/2014 10000 10000 11/30/2014 10240 10269 12/31/2014 10288 10243 1/31/2015 10176 9936 2/28/2015 10475 10507 3/31/2015 10328 10340 4/30/2015 10328 10440 5/31/2015 10415 10574 6/30/2015 10242 10369 7/31/2015 10267 10586 8/31/2015 9872 9948 9/30/2015 9716 9702 10/31/2015 10143 10520 11/30/2015 10174 10551 12/31/2015 10019 10385 1/31/2016 9709 9869 2/29/2016 9696 9856 3/31/2016 10078 10525 4/30/2016 10175 10566 5/31/2016 10227 10755 6/30/2016 10268 10783 7/31/2016 10489 11181 8/31/2016 10437 11196 9/30/2016 10299 11199 10/31/2016 10131 10994 11/30/2016 10449 11401 12/31/2016 10592 11627 1/31/2017 10734 11847 2/28/2017 11010 12318 3/31/2017 10943 12332 4/30/2017 11028 12459 5/31/2017 11141 12634 6/30/2017 11154 12713 7/31/2017 11246 12974 8/31/2017 11275 13014 9/30/2017 11486 13283 10/31/2017 11565 13593 11/30/2017 11821 14009 12/31/2017 12023 14165 1/31/2018 12346 14976 2/28/2018 12023 14424 3/31/2018 11853 14058 4/30/2018 11710 14112 5/31/2018 11861 14451 6/30/2018 11863 14540 7/31/2018 12187 15081 8/31/2018 12421 15573 9/30/2018 12492 15662 10/31/2018 11963 14591 11/30/2018 12076 14888 12/31/2018 11503 13544 1/31/2019 11928 14629 2/28/2019 12198 15099 3/31/2019 12389 15393 4/30/2019 12709 16016 5/31/2019 12233 14998 6/30/2019 12638 16055 7/31/2019 12762 16286 8/31/2019 12663 16028 9/30/2019 12827 16328 10/31/2019 12967 16681 11/30/2019 13198 17287 12/31/2019 13342 17809 1/31/2020 13386 17802 2/29/2020 12583 16336 3/31/2020 11368 14319 4/30/2020 12227 16154 5/31/2020 12670 16923 6/30/2020 12803 17260 7/31/2020 13327 18233 8/31/2020 13931 19544 9/30/2020 13674 18801 10/31/2020 13452 18301 11/30/2020 14270 20305 12/31/2020 14538 21085 1/31/2021 14397 20872 2/28/2021 14623 21448 3/31/2021 15369 22387 4/30/2021 15822 23582 5/31/2021 15907 23747 6/30/2021 15962 24301 7/31/2021 16142 24878 8/31/2021 16312 25635 9/30/2021 15723 24443 10/31/2021 16309 26155 11/30/2021 16224 25974 12/31/2021 16968 27138 1/31/2022 16383 25734 2/28/2022 15747 24963 3/31/2022 15952 25890 4/30/2022 14972 23632 5/31/2022 15053 23676 6/30/2022 14250 21721 7/31/2022 15070 23724 8/31/2022 14574 22757 9/30/2022 13656 20661 10/31/2022 14254 22334 11/30/2022 15035 23582 12/31/2022 14618 22223 1/31/2023 15108 23619 2/28/2023 14763 23043 3/31/2023 14942 23889 4/30/2023 15214 24262 5/31/2023 14963 24367 6/30/2023 15667 25977 7/31/2023 15960 26812 8/31/2023 15772 26385 9/30/2023 15155 25127 10/31/2023 14777 24599 11/30/2023 15668 26845 12/31/2023 16142 28065 1/31/2024 16119 28536 2/29/2024 16553 30060 3/31/2024 16984 31027 4/30/2024 16355 29760 5/31/2024 16641 31236 6/30/2024 16731 32356 7/31/2024 17315 32750 8/31/2024 17761 33545 9/30/2024 17831 34261 10/31/2024 17796 33950
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Equity and Income Fund 20.43% 6.54% 5.93% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 59,525,606
Holdings Count | Holdings	85
Advisory Fees Paid, Amount	$ 521,187
Investment Company, Portfolio Turnover	15%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $59,525,606 Number of Holdings 85 Annual Portfolio Turnover 15% Total Advisory Fee $521,187
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 6.06% Consumer Discretionary 8.78% Consumer Staples 5.26% Energy 2.36% Financials 28.10% Health Care 3.94% Industrials 9.91% Information Technology 10.30% Materials 7.80% Mortgage-Backed Securities 3.03% U.S. Treasury Obligations 12.67% Short-Term Investments and Other 2.53% Liabilities in Excess of Other Assets -0.80% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Equity and Income Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Equity and Income Fund
Class Name	Institutional Class
Trading Symbol	HEIIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $130 1.18%
Expenses Paid, Amount	$ 130
Expense Ratio, Percent	1.18%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed the S&P 500® Index. Factors Influencing Performance Equities Fixed Income
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Equity and Income Fund S&P 500® Index 10/31/2014 250000 250000 11/30/2014 256013 256724 12/31/2014 257273 256077 1/31/2015 254469 248390 2/28/2015 262056 262665 3/31/2015 258542 258511 4/30/2015 258542 260991 5/31/2015 260858 264347 6/30/2015 256523 259230 7/31/2015 257352 264661 8/31/2015 247397 248693 9/30/2015 243729 242540 10/31/2015 254384 262999 11/30/2015 255216 263781 12/31/2015 251488 259621 1/31/2016 243784 246737 2/29/2016 243442 246404 3/31/2016 253348 263120 4/30/2016 255581 264140 5/31/2016 257127 268883 6/30/2016 258181 269580 7/31/2016 263869 279519 8/31/2016 262662 279912 9/30/2016 259294 279965 10/31/2016 255145 274858 11/30/2016 263270 285037 12/31/2016 267050 290671 1/31/2017 270639 296184 2/28/2017 277627 307944 3/31/2017 275935 308304 4/30/2017 278210 311470 5/31/2017 281242 315853 6/30/2017 281675 317824 7/31/2017 283955 324360 8/31/2017 284906 325353 9/30/2017 290305 332064 10/31/2017 292402 339813 11/30/2017 298883 350235 12/31/2017 304113 354129 1/31/2018 312365 374404 2/28/2018 304314 360605 3/31/2018 300101 351441 4/30/2018 296666 352789 5/31/2018 300506 361285 6/30/2018 300690 363509 7/31/2018 309003 377036 8/31/2018 315086 389322 9/30/2018 316907 391538 10/31/2018 303686 364776 11/30/2018 306737 372210 12/31/2018 292005 338603 1/31/2019 303024 365737 2/28/2019 310077 377480 3/31/2019 315131 384815 4/30/2019 323325 400396 5/31/2019 311145 374952 6/30/2019 321514 401377 7/31/2019 324849 407146 8/31/2019 322625 400696 9/30/2019 326710 408194 10/31/2019 330280 417035 11/30/2019 336306 432173 12/31/2019 340180 445217 1/31/2020 341135 445042 2/29/2020 320830 408407 3/31/2020 290187 357963 4/30/2020 312047 403852 5/31/2020 323577 423087 6/30/2020 327005 431501 7/31/2020 340269 455831 8/31/2020 355944 488596 9/30/2020 349591 470031 10/31/2020 344027 457531 11/30/2020 365075 507614 12/31/2020 371983 527131 1/31/2021 368653 521809 2/28/2021 374289 536198 3/31/2021 393490 559681 4/30/2021 405312 589551 5/31/2021 407625 593669 6/30/2021 409275 607528 7/31/2021 413911 621959 8/31/2021 418547 640871 9/30/2021 403397 611064 10/31/2021 418624 653876 11/30/2021 416302 649345 12/31/2021 435704 678446 1/31/2022 421079 643339 2/28/2022 404799 624076 3/31/2022 410003 647248 4/30/2022 385121 590807 5/31/2022 387056 591891 6/30/2022 366583 543034 7/31/2022 387657 593104 8/31/2022 375179 568916 9/30/2022 351502 516520 10/31/2022 367352 558338 11/30/2022 387097 589540 12/31/2022 376473 555574 1/31/2023 389642 590483 2/28/2023 380767 576076 3/31/2023 385194 597226 4/30/2023 392370 606548 5/31/2023 386055 609184 6/30/2023 404355 649436 7/31/2023 412131 670299 8/31/2023 407523 659627 9/30/2023 391832 628177 10/31/2023 382014 614969 11/30/2023 405114 671131 12/31/2023 417503 701621 1/31/2024 417188 713411 2/29/2024 428523 751504 3/31/2024 439558 775684 4/30/2024 423465 744001 5/31/2024 431038 780892 6/30/2024 433637 808912 7/31/2024 448830 818759 8/31/2024 460542 838619 9/30/2024 462296 856530 10/31/2024 461661 848762
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Equity and Income Fund 20.85% 6.93% s6.33% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 59,525,606
Holdings Count | Holdings	85
Advisory Fees Paid, Amount	$ 521,187
Investment Company, Portfolio Turnover	15%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $59,525,606 Number of Holdings 85 Annual Portfolio Turnover 15% Total Advisory Fee $521,187
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 6.06% Consumer Discretionary 8.78% Consumer Staples 5.26% Energy 2.36% Financials 28.10% Health Care 3.94% Industrials 9.91% Information Technology 10.30% Materials 7.80% Mortgage-Backed Securities 3.03% U.S. Treasury Obligations 12.67% Short-Term Investments and Other 2.53% Liabilities in Excess of Other Assets -0.80% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Balanced Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Balanced Fund
Class Name	Investor Class
Trading Symbol	HBFBX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $192 1.82%
Expenses Paid, Amount	$ 192
Expense Ratio, Percent	1.82%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the 50/50 Blended DJIA/Treasury Index (the Fund’s primary benchmark) and the Dow Jones Industrial Average. Factors Influencing Performance ● Holdings in the Industrials, Information Technology, and Financials sectors contributed the most to performance. ● Holdings in the Consumer Staples sector detracted from performance. ● Stocks that contributed most to performance included 3M Company, The Goldman Sachs Group, Inc., and International Business Machines Corporation. ● Stocks that detracted most from performance included Walgreens Boots Alliance, Inc., Merck & Co., Inc., and Solventum Corporation.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Balanced Fund Dow Jones Industrial Average 50/50 Blended DJIA/Treasury Index 10/31/2014 10000 10000 10000 11/30/2014 10162 10286 10144 12/31/2014 10017 10298 10145 1/31/2015 9863 9929 9969 2/28/2015 10154 10526 10267 3/31/2015 9973 10332 10173 4/30/2015 10110 10378 10199 5/31/2015 10102 10518 10270 6/30/2015 9925 10301 10164 7/31/2015 9965 10355 10192 8/31/2015 9641 9714 9876 9/30/2015 9534 9582 9814 10/31/2015 10011 10406 10235 11/30/2015 9987 10479 10263 12/31/2015 9991 10320 10185 1/31/2016 9891 9764 9921 2/29/2016 9908 9837 9959 3/31/2016 10275 10547 10325 4/30/2016 10341 10612 10362 5/31/2016 10366 10664 10386 6/30/2016 10557 10765 10447 7/31/2016 10689 11081 10600 8/31/2016 10656 11110 10613 9/30/2016 10706 11064 10595 10/31/2016 10532 10977 10556 11/30/2016 10789 11622 10863 12/31/2016 10905 12022 11053 1/31/2017 10887 12097 11096 2/28/2017 11119 12722 11385 3/31/2017 11022 12646 11349 4/30/2017 11066 12829 11436 5/31/2017 11048 12921 11478 6/30/2017 11085 13146 11580 7/31/2017 11317 13498 11743 8/31/2017 11317 13586 11787 9/30/2017 11520 13880 11916 10/31/2017 11538 14497 12182 11/30/2017 11690 15111 12437 12/31/2017 11815 15402 12559 1/31/2018 12056 16307 12932 2/28/2018 11729 15661 12677 3/31/2018 11638 15099 12460 4/30/2018 11725 15151 12485 5/31/2018 11735 15364 12587 6/30/2018 11785 15290 12564 7/31/2018 11920 16029 12876 8/31/2018 12017 16439 13055 9/30/2018 12112 16762 13187 10/31/2018 11937 15927 12872 11/30/2018 12257 16262 13022 12/31/2018 11827 14866 12486 1/31/2019 12122 15950 12958 2/28/2019 12395 16593 13232 3/31/2019 12533 16622 13267 4/30/2019 12573 17064 13458 5/31/2019 12258 15986 13054 6/30/2019 12651 17155 13557 7/31/2019 12692 17346 13637 8/31/2019 12467 17116 13572 9/30/2019 12618 17468 13720 10/31/2019 12659 17570 13783 11/30/2019 12823 18292 14070 12/31/2019 12973 18633 14215 1/31/2020 12578 18468 14169 2/29/2020 12002 16667 13512 3/31/2020 11392 14397 12658 4/30/2020 11895 16012 13366 5/31/2020 11981 16758 13675 6/30/2020 11818 17062 13802 7/31/2020 11904 17490 13979 8/31/2020 12043 18875 14532 9/30/2020 11839 18464 14376 10/31/2020 11667 17630 14052 11/30/2020 12420 19771 14908 12/31/2020 12587 20445 15163 1/31/2021 12554 20046 15016 2/28/2021 12878 20734 15276 3/31/2021 13413 22140 15795 4/30/2021 13435 22756 16018 5/31/2021 13640 23259 16195 6/30/2021 13534 23263 16196 7/31/2021 13437 23575 16307 8/31/2021 13523 23928 16429 9/30/2021 13221 22924 16083 10/31/2021 13372 24282 16557 11/30/2021 13059 23432 16263 12/31/2021 13592 24727 16704 1/31/2022 13626 23926 16411 2/28/2022 13514 23138 16128 3/31/2022 13719 23713 16298 4/30/2022 13562 22569 15890 5/31/2022 13909 22643 15933 6/30/2022 13237 21157 15370 7/31/2022 13372 22600 15907 8/31/2022 13058 21759 15594 9/30/2022 12515 19852 14877 10/31/2022 13279 22645 15929 11/30/2022 13762 24013 16435 12/31/2022 13429 23031 16132 1/31/2023 13558 23705 16397 2/28/2023 13266 22770 16077 3/31/2023 13465 23245 16315 4/30/2023 13406 23843 16540 5/31/2023 13077 23088 16280 6/30/2023 13324 24167 16680 7/31/2023 13643 24999 17006 8/31/2023 13643 24497 16870 9/30/2023 13380 23660 16611 10/31/2023 13249 23362 16545 11/30/2023 13654 25501 17355 12/31/2023 14133 26757 17844 1/31/2024 14169 27108 17997 2/29/2024 14073 27786 18227 3/31/2024 14388 28399 18464 4/30/2024 14134 27003 18031 5/31/2024 14340 27699 18306 6/30/2024 14217 28039 18459 7/31/2024 14728 29305 18943 8/31/2024 14874 29900 19197 9/30/2024 15014 30485 19450 10/31/2024 14769 30102 19327
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Balanced Fund 11.47% 3.13% 3.98% 50/50 Blended DJIA/Treasury Index 16.82% 7.00% 6.81% Dow Jones Industrial Average 28.85% 11.37% 11.65%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 12,711,042
Holdings Count | Holdings	16
Advisory Fees Paid, Amount	$ 79,916
Investment Company, Portfolio Turnover	57%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $12,711,042 Number of Holdings 16 Annual Portfolio Turnover 57% Total Advisory Fee $79,916
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 5.04% Consumer Discretionary 0.77% Consumer Staples 6.39% Energy 4.97% Financials 3.26% Health Care 10.05% Industrials 4.09% Information Technology 9.25% Materials 4.51% Short-Term Investments and Other 51.4% Other Assets in Excess of Liabilities 0.19% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Energy Transition Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Energy Transition Fund
Class Name	Investor Class
Trading Symbol	HNRGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $252 2.44%
Expenses Paid, Amount	$ 252
Expense Ratio, Percent	2.44%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the S&P 500® Energy Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in Utilities, Materials, and small-capitalization Oilfield Services companies contributed the most to performance. ● Holdings in large-capitalization Oilfield Services companies detracted the most from performance. ● Stocks that contributed most to performance included Solaris Energy Infrastructure, Inc., NextEra Energy, Inc. and Freeport-McMoRan, Inc. ● Stocks that detracted most from performance included Haliburton Co., Schlumberger N.V., and NOV, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Energy Transition Fund S&P 500® Index S&P 500® Energy Index 10/31/2014 10000 10000 10000 11/30/2014 9368 10269 9151 12/31/2014 9001 10243 9197 1/31/2015 8870 9936 8754 2/28/2015 9434 10507 9109 3/31/2015 9462 10340 8934 4/30/2015 10394 10440 9529 5/31/2015 9745 10574 9075 6/30/2015 9312 10369 8766 7/31/2015 8328 10586 8096 8/31/2015 7872 9948 7757 9/30/2015 6931 9702 7240 10/31/2015 7665 10520 8068 11/30/2015 7721 10551 8049 12/31/2015 6780 10385 7255 1/31/2016 6418 9869 7036 2/29/2016 6225 9856 6904 3/31/2016 7166 10525 7546 4/30/2016 8117 10566 8203 5/31/2016 8065 10755 8155 6/30/2016 8173 10783 8423 7/31/2016 8343 11181 8260 8/31/2016 8724 11196 8355 9/30/2016 9133 11199 8613 10/31/2016 8583 10994 8362 11/30/2016 9665 11401 9065 12/31/2016 9693 11627 9239 1/31/2017 9815 11847 8907 2/28/2017 9585 12318 8712 3/31/2017 9505 12332 8622 4/30/2017 9095 12459 8373 5/31/2017 8663 12634 8088 6/30/2017 8587 12713 8074 7/31/2017 8686 12974 8276 8/31/2017 8211 13014 7847 9/30/2017 9015 13283 8627 10/31/2017 8940 13593 8569 11/30/2017 9161 14009 8720 12/31/2017 9877 14165 9146 1/31/2018 10008 14976 9495 2/28/2018 9039 14424 8468 3/31/2018 9152 14058 8608 4/30/2018 10036 14112 9414 5/31/2018 10319 14451 9700 6/30/2018 10098 14540 9769 7/31/2018 10375 15081 9908 8/31/2018 10135 15573 9581 9/30/2018 10084 15662 9829 10/31/2018 8620 14591 8722 11/30/2018 8145 14888 8578 12/31/2018 6799 13544 7491 1/31/2019 7806 14629 8323 2/28/2019 7877 15099 8541 3/31/2019 7961 15393 8722 4/30/2019 8131 16016 8728 5/31/2019 6926 14998 7755 6/30/2019 7609 16055 8474 7/31/2019 7420 16286 8323 8/31/2019 6583 16028 7652 9/30/2019 6813 16328 7940 10/31/2019 6625 16681 7759 11/30/2019 6578 17287 7900 12/31/2019 7190 17809 8376 1/31/2020 6348 17802 7449 2/29/2020 5402 16336 6365 3/31/2020 2884 14319 4150 4/30/2020 4192 16154 5386 5/31/2020 4371 16923 5487 6/30/2020 4320 17260 5416 7/31/2020 4451 18233 5139 8/31/2020 4578 19544 5086 9/30/2020 3915 18801 4348 10/31/2020 4112 18301 4156 11/30/2020 5054 20305 5321 12/31/2020 5341 21085 5555 1/31/2021 5741 20872 5765 2/28/2021 6809 21448 7072 3/31/2021 6945 22387 7269 4/30/2021 7011 23582 7312 5/31/2021 7514 23747 7734 6/30/2021 7886 24301 8091 7/31/2021 7147 24878 7422 8/31/2021 7006 25635 7270 9/30/2021 7980 24443 7956 10/31/2021 8615 26155 8781 11/30/2021 8065 25974 8334 12/31/2021 8300 27138 8591 1/31/2022 9344 25734 10232 2/28/2022 10180 24963 10961 3/31/2022 11228 25890 11943 4/30/2022 11095 23632 11759 5/31/2022 12703 23676 13614 6/30/2022 10318 21721 11326 7/31/2022 11319 23724 12427 8/31/2022 11559 22757 12778 9/30/2022 10414 20661 11592 10/31/2022 12858 22334 14485 11/30/2022 13001 23582 14668 12/31/2022 12245 22223 14236 1/31/2023 12721 23619 14636 2/28/2023 12020 23043 13595 3/31/2023 11603 23889 13571 4/30/2023 11742 24262 14019 5/31/2023 10789 24367 12613 6/30/2023 11844 25977 13451 7/31/2023 13064 26812 14446 8/31/2023 13149 26385 14708 9/30/2023 13144 25127 15094 10/31/2023 12962 24599 14193 11/30/2023 12786 26845 14050 12/31/2023 12700 28065 14047 1/31/2024 12341 28536 13994 2/29/2024 12796 30060 14439 3/31/2024 14215 31027 15970 4/30/2024 14284 29760 15848 5/31/2024 14643 31236 15786 6/30/2024 14113 32356 15583 7/31/2024 14514 32750 15912 8/31/2024 14252 33545 15641 9/30/2024 13968 34261 15222 10/31/2024 13851 33950 15342
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Energy Transition Fund 6.85% 15.89% 3.31% S&P 500® Energy Index 8.09% 14.61% 4.37% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 14,612,549
Holdings Count | Holdings	24
Advisory Fees Paid, Amount	$ 193,777
Investment Company, Portfolio Turnover	14%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $14,612,549 Number of Holdings 24 Annual Portfolio Turnover 14% Total Advisory Fee $193,777
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Downstream 5.81% Exploration and Production 41.80% Integrated 11.80% Materials 4.44% Midstream 6.42% Oil Services 19.67% Utilities 9.75% Short-Term Investments and Other 1.37% Liabilities in Excess of Other Assets -1.12% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Energy Transition Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Energy Transition Fund
Class Name	Institutional Class
Trading Symbol	HNRIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $219 2.11%
Expenses Paid, Amount	$ 219
Expense Ratio, Percent	2.11%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the S&P 500® Energy Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in Utilities, Materials, and small-capitalization Oilfield Services companies contributed the most to performance. ● Holdings in large-capitalization Oilfield Services companies detracted the most from performance. ● Stocks that contributed most to performance included Solaris Energy Infrastructure, Inc., NextEra Energy, Inc. and Freeport-McMoRan, Inc. ● Stocks that detracted most from performance included Haliburton Co., Schlumberger N.V., and NOV, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Energy Transition Fund S&P 500® Index S&P 500® Energy Index 10/31/2014 250000 250000 250000 11/30/2014 234089 256724 228787 12/31/2014 224930 256077 229924 1/31/2015 221755 248390 218865 2/28/2015 235865 262665 227736 3/31/2015 236688 258511 223364 4/30/2015 259969 260991 238218 5/31/2015 243860 264347 226872 6/30/2015 233043 259230 219161 7/31/2015 208469 264661 202394 8/31/2015 197064 248693 193941 9/30/2015 173548 242540 181002 10/31/2015 192008 262999 201715 11/30/2015 193536 263781 201226 12/31/2015 170020 259621 181370 1/31/2016 160967 246737 175891 2/29/2016 156146 246404 172591 3/31/2016 179779 263120 188657 4/30/2016 203648 264140 205072 5/31/2016 202472 268883 203883 6/30/2016 205294 269580 210573 7/31/2016 209527 279519 206509 8/31/2016 219169 279912 208889 9/30/2016 229516 279965 215325 10/31/2016 215641 274858 209061 11/30/2016 243104 285037 226631 12/31/2016 243693 290671 230991 1/31/2017 246873 296184 222681 2/28/2017 241220 307944 217795 3/31/2017 239217 308304 215557 4/30/2017 228970 311470 209329 5/31/2017 218016 315853 202210 6/30/2017 216250 317824 201852 7/31/2017 218723 324360 206901 8/31/2017 206827 325353 196174 9/30/2017 227086 332064 215667 10/31/2017 225319 339813 214241 11/30/2017 230973 350235 218016 12/31/2017 248993 354129 228660 1/31/2018 252291 374404 237380 2/28/2018 228028 360605 211694 3/31/2018 230855 351441 215213 4/30/2018 253234 352789 235348 5/31/2018 260418 361285 242503 6/30/2018 254882 363509 244224 7/31/2018 262067 377036 247693 8/31/2018 255943 389322 239526 9/30/2018 254647 391538 245723 10/31/2018 217899 364776 218043 11/30/2018 205767 372210 214455 12/31/2018 171963 338603 187282 1/31/2019 197404 365737 208091 2/28/2019 199289 377480 213542 3/31/2019 201409 384815 218048 4/30/2019 205767 400396 218199 5/31/2019 175379 374952 193891 6/30/2019 192693 401377 211866 7/31/2019 187982 407146 208089 8/31/2019 166899 400696 191302 9/30/2019 172670 408194 198516 10/31/2019 167959 417035 193976 11/30/2019 166781 432173 197503 12/31/2019 182370 445217 209406 1/31/2020 161005 445042 186229 2/29/2020 137043 408407 159121 3/31/2020 73184 357963 103754 4/30/2020 106353 403852 134651 5/31/2020 110838 423087 137187 6/30/2020 109658 431501 135408 7/31/2020 112963 455831 128465 8/31/2020 116150 488596 127154 9/30/2020 99388 470031 108700 10/31/2020 104464 457531 103902 11/30/2020 128426 507614 133030 12/31/2020 135626 527131 138881 1/31/2021 145896 521809 144138 2/28/2021 173045 536198 176796 3/31/2021 176586 559681 181732 4/30/2021 178238 589551 182805 5/31/2021 191222 593669 193347 6/30/2021 200784 607528 202269 7/31/2021 182015 621959 185546 8/31/2021 178474 640871 181752 9/30/2021 203380 611064 198911 10/31/2021 219552 653876 219526 11/30/2021 205505 649345 208357 12/31/2021 211602 678446 214770 1/31/2022 238202 643339 255800 2/28/2022 259723 624076 274031 3/31/2022 286458 647248 298587 4/30/2022 283116 590807 293990 5/31/2022 324287 591891 340348 6/30/2022 263600 543034 283155 7/31/2022 288997 593104 310676 8/31/2022 295280 568916 319465 9/30/2022 266273 516520 289808 10/31/2022 328698 558338 362142 11/30/2022 332440 589540 366696 12/31/2022 313192 555574 355909 1/31/2023 325451 590483 365911 2/28/2023 307669 576076 339871 3/31/2023 297162 597226 339291 4/30/2023 300665 606548 350491 5/31/2023 276417 609184 315320 6/30/2023 303493 649436 336274 7/31/2023 334880 670299 361147 8/31/2023 337170 659627 367698 9/30/2023 337170 628177 377366 10/31/2023 332455 614969 354826 11/30/2023 328145 671131 351263 12/31/2023 325989 701621 351187 1/31/2024 316829 713411 349865 2/29/2024 328684 751504 360978 3/31/2024 365189 775684 399250 4/30/2024 367075 744001 396200 5/31/2024 376370 780892 394666 6/30/2024 362899 808912 389578 7/31/2024 373271 818759 397804 8/31/2024 366671 838619 391045 9/30/2024 359531 856530 380555 10/31/2024 356433 848762 383554
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Energy Transition Fund 7.21% 16.24% 3.61% S&P 500® Energy Index 8.09% 14.61% 4.37% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 14,612,549
Holdings Count | Holdings	24
Advisory Fees Paid, Amount	$ 193,777
Investment Company, Portfolio Turnover	14%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $14,612,549 Number of Holdings 24 Annual Portfolio Turnover 14% Total Advisory Fee $193,777
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Downstream 5.81% Exploration and Production 41.80% Integrated 11.80% Materials 4.44% Midstream 6.42% Oil Services 19.67% Utilities 9.75% Short-Term Investments and Other 1.37% Liabilities in Excess of Other Assets -1.12% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Midstream Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Midstream Fund
Class Name	Investor Class
Trading Symbol	HMSFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $201 1.75%
Expenses Paid, Amount	$ 201
Expense Ratio, Percent	1.75%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the Alerian US Midstream Energy Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in large-capitalization hydrocarbon processing and transportation companies structured as master limited partnerships and C-corp. companies contributed the most to performance. ● Holdings in the natural gas transportation-oriented master limited partnerships and natural gas liquid processing C-corp. structured companies detracted the most from performance. ● Stocks that contributed most to performance included Energy Transfer, LP, ONEOK, Inc., and MPLX, LP. ● Stocks that detracted most from performance included Cheniere Energy Partners, LP and EnLink Midstream, LLC.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Midstream Fund S&P 500® Index Alerian US Midstream Energy Index 10/31/14 10000 10000 10000 10/31/15 7665 10520 7280 10/31/16 7994 10994 7351 10/31/17 7798 13593 7175 10/31/18 7238 14591 7420 10/31/19 6784 16681 7354 10/31/20 3926 18301 4626 10/31/21 7004 26155 8788 10/31/22 8687 22334 11093 10/31/23 10110 24599 12337 10/31/24 12618 33950 17806
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Midstream Fund 24.81% 13.22% 2.35% Alerian US Midstream Energy Index 44.33% 19.35% 5.94% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 67,303,172
Holdings Count | Holdings	17
Advisory Fees Paid, Amount	$ 686,633
Investment Company, Portfolio Turnover	6%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $67,303,172 Number of Holdings 17 Annual Portfolio Turnover 6% Total Advisory Fee $686,633
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Crude Oil and Refined Products 21.00% Geathering and Processing 24.40% Natural Gas/NGL Transportation 56.70% Short-Term Investments and Other 5.80% Liabilities in Excess of Other Assets -7.90% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Midstream Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Midstream Fund
Class Name	Institutional Class
Trading Symbol	HMSIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $169 1.50%
Expenses Paid, Amount	$ 169
Expense Ratio, Percent	1.50%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the Alerian US Midstream Energy Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in large-capitalization hydrocarbon processing and transportation companies structured as master limited partnerships and C-corp. companies contributed the most to performance. ● Holdings in the natural gas transportation-oriented master limited partnerships and natural gas liquid processing C-corp. structured companies detracted the most from performance. ● Stocks that contributed most to performance included Energy Transfer, LP, ONEOK, Inc., and MPLX, LP. ● Stocks that detracted most from performance included Cheniere Energy Partners, LP and EnLink Midstream, LLC.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Midstream Fund S&P 500® Index Alerian US Midstream Energy Index 10/31/14 250000 250000 250000 10/31/15 192167 262999 181997 10/31/16 200963 274858 183773 10/31/17 196466 339813 179363 10/31/18 182934 364776 185512 10/31/19 171768 417035 183844 10/31/20 99740 457531 115648 10/31/21 178106 653876 219710 10/31/22 221591 558338 277314 10/31/23 258528 614969 308432 10/31/24 323938 848762 445154
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Midstream Fund 25.30% 13.53% 2.62% Alerian US Midstream Energy Index 44.33% 19.35% 5.94% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 67,303,172
Holdings Count | Holdings	17
Advisory Fees Paid, Amount	$ 686,633
Investment Company, Portfolio Turnover	6%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $67,303,172 Number of Holdings 17 Annual Portfolio Turnover 6% Total Advisory Fee $686,633
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Crude Oil and Refined Products 21.00% Geathering and Processing 24.40% Natural Gas/NGL Transportation 56.70% Short-Term Investments and Other 5.80% Liabilities in Excess of Other Assets -7.90% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Gas Utility Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Gas Utility Fund
Class Name	Investor Class
Trading Symbol	GASFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $114 0.99%
Expenses Paid, Amount	$ 114
Expense Ratio, Percent	0.99%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund slightly underperformed the AGA Stock Index (the Fund’s primary benchmark) and significantly underperformed the S&P 500® Index. Factors Influencing Performance ● Holdings in the Oil & Gas Storage & Transportation industry and Multi-Utilities contributed the most to performance. ● Exposure to Oil & Gas Exploration & Production sectors detracted from performance. ● Stocks that contributed the most to performance included Kinder Morgan Inc., TC Energy Corp., and ONEOK, Inc. ● Only EQT Corp. detracted from performance.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Gas Utility Fund S&P 500® Index AGA Stock Index 10/31/2014 10000 10000 10000 11/30/2014 9901 10269 9897 12/31/2014 10098 10243 10080 1/31/2015 10059 9936 10065 2/28/2015 9880 10507 9872 3/31/2015 9913 10340 9917 4/30/2015 10023 10440 10038 5/31/2015 9983 10574 9999 6/30/2015 9489 10369 9508 7/31/2015 9616 10586 9665 8/31/2015 9211 9948 9256 9/30/2015 8889 9702 8956 10/31/2015 9341 10520 9416 11/30/2015 8879 10551 8953 12/31/2015 8482 10385 8581 1/31/2016 8684 9869 8793 2/29/2016 8869 9856 8991 3/31/2016 9518 10525 9663 4/30/2016 9613 10566 9768 5/31/2016 9711 10755 9884 6/30/2016 10426 10783 10635 7/31/2016 10429 11181 10640 8/31/2016 10065 11196 10277 9/30/2016 10340 11199 10570 10/31/2016 10137 10994 10362 11/30/2016 9981 11401 10216 12/31/2016 10238 11627 10492 1/31/2017 10476 11847 10743 2/28/2017 10751 12318 11030 3/31/2017 10806 12332 11101 4/30/2017 10824 12459 11127 5/31/2017 11046 12634 11369 6/30/2017 10856 12713 11183 7/31/2017 11128 12974 11480 8/31/2017 11275 13014 11642 9/30/2017 11080 13283 11461 10/31/2017 11190 13593 11586 11/30/2017 11389 14009 11805 12/31/2017 10958 14165 11371 1/31/2018 10619 14976 11025 2/28/2018 10013 14424 10403 3/31/2018 10235 14058 10652 4/30/2018 10538 14112 10979 5/31/2018 10662 14451 11122 6/30/2018 10972 14540 11458 7/31/2018 11100 15081 11607 8/31/2018 11149 15573 11677 9/30/2018 11048 15662 11585 10/31/2018 10870 14591 11403 11/30/2018 11215 14888 11750 12/31/2018 10573 13544 11076 1/31/2019 11350 14629 11917 2/28/2019 11679 15099 12272 3/31/2019 12061 15393 12690 4/30/2019 12103 16016 12750 5/31/2019 11944 14998 12596 6/30/2019 12386 16055 13088 7/31/2019 12142 16286 12841 8/31/2019 12281 16028 13011 9/30/2019 12704 16328 13475 10/31/2019 12531 16681 13306 11/30/2019 12201 17287 12955 12/31/2019 12771 17809 13586 1/31/2020 13105 17802 13962 2/29/2020 11757 16336 12551 3/31/2020 10332 14319 10976 4/30/2020 10957 16154 11673 5/31/2020 11133 16923 11875 6/30/2020 10729 17260 11467 7/31/2020 11181 18233 11954 8/31/2020 11027 19544 11803 9/30/2020 10779 18801 11553 10/31/2020 10966 18301 11768 11/30/2020 11649 20305 12530 12/31/2020 11581 21085 12465 1/31/2021 11472 20872 12346 2/28/2021 11244 21448 12124 3/31/2021 12463 22387 13456 4/30/2021 13041 23582 14096 5/31/2021 13121 23747 14200 6/30/2021 12825 24301 13892 7/31/2021 12981 24878 14032 8/31/2021 13116 25635 14201 9/30/2021 12610 24443 13655 10/31/2021 13149 26155 14255 11/30/2021 12791 25974 13888 12/31/2021 13841 27138 15048 1/31/2022 14138 25734 15384 2/28/2022 14314 24963 15525 3/31/2022 15675 25890 17080 4/30/2022 15332 23632 16713 5/31/2022 16024 23676 17497 6/30/2022 14661 21721 16004 7/31/2022 15706 23724 17168 8/31/2022 15484 22757 16941 9/30/2022 13789 20661 15103 10/31/2022 14482 22334 15868 11/30/2022 15332 23582 16814 12/31/2022 14693 22223 16126 1/31/2023 14938 23619 16409 2/28/2023 14262 23043 15679 3/31/2023 14564 23889 16023 4/30/2023 14919 24262 16435 5/31/2023 14059 24367 15506 6/30/2023 14575 25977 16040 7/31/2023 14926 26812 16449 8/31/2023 14309 26385 15776 9/30/2023 13732 25127 15140 10/31/2023 13756 24599 15183 11/30/2023 14500 26845 16030 12/31/2023 14732 28065 16303 1/31/2024 14311 28536 15851 2/29/2024 14502 30060 16076 3/31/2024 15176 31027 16832 4/30/2024 15163 29760 16831 5/31/2024 15740 31236 17497 6/30/2024 15529 32356 17231 7/31/2024 16505 32750 18344 8/31/2024 17191 33545 19111 9/30/2024 17702 34261 19706 10/31/2024 17929 33950 19872
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Gas Utility Fund 30.34% 7.43% 6.01% AGA Stock Index 30.88% 8.35% 7.11% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 477,829,775
Holdings Count | Holdings	49
Advisory Fees Paid, Amount	$ 1,785,847
Investment Company, Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $477,829,775 Number of Holdings 49 Annual Portfolio Turnover 13% Total Advisory Fee $1,785,847
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Energy 34.01% Financials 4.82% Industrials 1.06% Utilities 59.79% Short-Term Investments and Other 0.33% Liabilities in Excess of Other Assets -0.01% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Gas Utility Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Gas Utility Fund
Class Name	Institutional Class
Trading Symbol	HGASX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $80 0.69%
Expenses Paid, Amount	$ 80
Expense Ratio, Percent	0.69%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund slightly underperformed the AGA Stock Index (the Fund’s primary benchmark) and significantly underperformed the S&P 500® Index. Factors Influencing Performance ● Holdings in the Oil & Gas Storage & Transportation industry and Multi-Utilities contributed the most to performance. ● Exposure to Oil & Gas Exploration & Production sectors detracted from performance. ● Stocks that contributed the most to performance included Kinder Morgan Inc., TC Energy Corp., and ONEOK, Inc. ● Only EQT Corp. detracted from performance.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Gas Utility Fund S&P 500® Index AGA Stock Index 10/31/2014 250000 250000 250000 11/30/2014 247524 256724 247414 12/31/2014 252459 256077 252009 1/31/2015 251466 248390 251623 2/28/2015 246997 262665 246810 3/31/2015 247821 258511 247926 4/30/2015 250569 260991 250962 5/31/2015 249570 264347 249977 6/30/2015 237221 259230 237696 7/31/2015 240406 264661 241625 8/31/2015 230263 248693 231397 9/30/2015 222226 242540 223911 10/31/2015 233527 262999 235398 11/30/2015 221973 263781 223825 12/31/2015 212047 259621 214518 1/31/2016 217107 246737 219828 2/29/2016 221730 246404 224777 3/31/2016 237954 263120 241574 4/30/2016 240325 264140 244205 5/31/2016 242783 268883 247102 6/30/2016 260638 269580 265877 7/31/2016 260726 279519 265999 8/31/2016 251632 279912 256914 9/30/2016 258490 279965 264251 10/31/2016 253433 274858 259041 11/30/2016 249530 285037 255397 12/31/2016 255947 290671 262294 1/31/2017 261910 296184 268565 2/28/2017 268776 307944 275749 3/31/2017 270264 308304 277514 4/30/2017 270719 311470 278174 5/31/2017 276357 315853 284230 6/30/2017 271721 317824 279571 7/31/2017 278615 324360 286989 8/31/2017 282383 325353 291046 9/30/2017 277513 332064 286528 10/31/2017 280380 339813 289657 11/30/2017 285466 350235 295120 12/31/2017 274723 354129 284264 1/31/2018 266319 374404 275620 2/28/2018 251191 360605 260078 3/31/2018 256848 351441 266300 4/30/2018 264565 352789 274484 5/31/2018 267671 361285 278046 6/30/2018 275558 363509 286456 7/31/2018 278875 377036 290164 8/31/2018 280202 389322 291921 9/30/2018 277827 391538 289620 10/31/2018 273343 364776 285069 11/30/2018 282120 372210 293760 12/31/2018 266056 338603 276909 1/31/2019 285667 365737 297914 2/28/2019 294057 377480 306793 3/31/2019 303765 384815 317255 4/30/2019 304928 400396 318747 5/31/2019 301017 374952 314912 6/30/2019 312169 401377 327212 7/31/2019 306100 407146 321017 8/31/2019 309720 400696 325276 9/30/2019 320460 408194 336869 10/31/2019 316076 417035 332657 11/30/2019 307949 432173 323877 12/31/2019 322413 445217 339643 1/31/2020 330886 445042 349058 2/29/2020 296995 408407 313782 3/31/2020 260964 357963 274400 4/30/2020 276804 403852 291837 5/31/2020 281362 423087 296885 6/30/2020 271329 431501 286668 7/31/2020 282678 455831 298861 8/31/2020 278895 488596 295078 9/30/2020 272727 470031 288832 10/31/2020 277465 457531 294201 11/30/2020 294915 507614 313239 12/31/2020 293255 527131 311632 1/31/2021 290612 521809 308658 2/28/2021 284822 536198 303092 3/31/2021 315914 559681 336405 4/30/2021 330607 589551 352399 5/31/2021 332634 593669 355005 6/30/2021 325239 607528 347310 7/31/2021 329320 621959 350796 8/31/2021 332892 640871 355025 9/30/2021 320023 611064 341386 10/31/2021 333753 653876 356364 11/30/2021 324771 649345 347202 12/31/2021 351629 678446 376194 1/31/2022 359340 643339 384604 2/28/2022 363827 624076 388135 3/31/2022 398509 647248 427005 4/30/2022 389763 590807 417834 5/31/2022 407678 591891 437427 6/30/2022 372961 543034 400089 7/31/2022 399783 593104 429195 8/31/2022 394106 568916 423529 9/30/2022 351052 516520 377566 10/31/2022 368898 558338 396688 11/30/2022 390598 589540 420338 12/31/2022 374405 555574 403152 1/31/2023 380826 590483 410216 2/28/2023 363704 576076 391964 3/31/2023 371370 597226 400570 4/30/2023 380596 606548 410866 5/31/2023 358760 609184 387651 6/30/2023 371893 649436 400989 7/31/2023 381032 670299 411229 8/31/2023 365233 659627 394400 9/30/2023 350617 628177 378512 10/31/2023 351398 614969 379577 11/30/2023 370443 671131 400743 12/31/2023 376490 701621 407569 1/31/2024 365850 713411 396281 2/29/2024 370924 751504 401908 3/31/2024 388122 775684 420791 4/30/2024 387793 744001 420783 5/31/2024 402771 780892 437433 6/30/2024 397479 808912 430771 7/31/2024 422539 818759 458590 8/31/2024 440131 838619 477781 9/30/2024 453413 856530 492654 10/31/2024 459427 848762 496789
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Gas Utility Fund 30.74% 7.77% 6.27% AGA Stock Index 30.88% 8.35% 7.11% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 477,829,775
Holdings Count | Holdings	49
Advisory Fees Paid, Amount	$ 1,785,847
Investment Company, Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $477,829,775 Number of Holdings 49 Annual Portfolio Turnover 13% Total Advisory Fee $1,785,847
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Energy 34.01% Financials 4.82% Industrials 1.06% Utilities 59.79% Short-Term Investments and Other 0.33% Liabilities in Excess of Other Assets -0.01% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Japan Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Japan Fund
Class Name	Investor Class
Trading Symbol	HJPNX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $164 1.42%
Expenses Paid, Amount	$ 164
Expense Ratio, Percent	1.42%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one year period ended October 31, 2024, the Fund outperformed both the Russell/Nomura Total Market™ Index (the Fund’s primary benchmark) and the Tokyo Stock Price Index (TOPIX). Factors Influencing Performance Exposure to Financial and Industrial sectors contributed positively, while exposure to the Communication Service sector detracted from the Fund’s performance. Positive contributions were led by Insurance companies such as MS&AD Insurance Group Holdings, Inc., Tokio Marine Holdings, Inc., and Sompo Holdings, Inc. With pressure from the Japanese Financial Services Agency, these insurers have adopted plans for divesting certain strategic equity holdings, which has been positively received by the market. We believe that corporate governance reforms remain the biggest driver of the Japanese stock market.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Japan Fund Russell/Nomura Total Market™ Index Tokyo Stock Price Index (TOPIX) 10/31/2014 10000 10000 10000 11/30/2014 9729 9950 9994 12/31/2014 9646 9801 9926 01/31/2015 10005 10015 10142 02/28/2015 10519 10658 10732 03/31/2015 10721 10804 10923 04/30/2015 10813 11282 11298 05/31/2015 10831 11401 11446 06/30/2015 11052 11256 11329 07/31/2015 11346 11273 11391 08/31/2015 10744 10704 10788 09/30/2015 9867 9997 10092 10/31/2015 11056 10979 11065 11/30/2015 11116 10944 10985 12/31/2015 10896 10949 11015 01/31/2016 10464 10122 10154 02/29/2016 10570 9811 9871 03/31/2016 10974 10334 10394 04/30/2016 11208 10669 10708 05/31/2016 11709 10712 10788 06/30/2016 11851 10489 10542 07/31/2016 12081 11033 11206 08/31/2016 12145 11129 11163 09/30/2016 12687 11423 11446 10/31/2016 12774 11571 11612 11/30/2016 12186 11349 11298 12/31/2016 12122 11312 11422 01/31/2017 12811 11698 11858 02/28/2017 12761 11934 12043 03/31/2017 12802 11927 12025 04/30/2017 13050 12132 12172 05/31/2017 13730 12475 12560 06/30/2017 13817 12705 12726 07/31/2017 14038 12923 12997 08/31/2017 14166 12936 13046 09/30/2017 14355 13255 13305 10/31/2017 15044 13906 13902 11/30/2017 15765 14223 14326 12/31/2017 16006 14384 14455 01/31/2018 16581 15080 15077 02/28/2018 16213 14746 14849 03/31/2018 16227 14559 14597 04/30/2018 16195 14619 14689 05/31/2018 16420 14469 14548 06/30/2018 16365 14105 14160 07/31/2018 16153 14193 14197 08/31/2018 16585 14135 14185 09/30/2018 17366 14562 14615 10/31/2018 15446 13228 13329 11/30/2018 16016 13365 13415 12/31/2018 14955 12310 12388 01/31/2019 15447 13145 13188 02/28/2019 15700 13238 13231 03/31/2019 16044 13243 13317 04/30/2019 16545 13386 13434 05/31/2019 15778 12845 12898 06/30/2019 16343 13339 13360 07/31/2019 16081 13363 13378 08/31/2019 15792 13154 13225 09/30/2019 16394 13764 13772 10/31/2019 17083 14357 14455 11/30/2019 17322 14516 14548 12/31/2019 17653 14780 14825 01/31/2020 16976 14477 14591 02/29/2020 15716 13028 13157 03/31/2020 14795 12264 12357 04/30/2020 15720 13046 13015 05/31/2020 17506 13869 13800 06/30/2020 17860 13806 13755 07/31/2020 18412 13703 13471 08/31/2020 19346 14584 14528 09/30/2020 19673 14777 14789 10/31/2020 19692 14555 14506 11/30/2020 21611 16263 16163 12/31/2020 22158 16855 16808 01/31/2021 21753 16741 16614 02/28/2021 21629 17012 16835 03/31/2021 21086 17192 17158 04/30/2021 20718 17030 16867 05/31/2021 20856 17093 17072 06/30/2021 20718 17167 17026 07/31/2021 20943 16920 16843 08/31/2021 21928 17419 17360 09/30/2021 22559 17841 17837 10/31/2021 21988 17345 17207 11/30/2021 21592 16812 16656 12/31/2021 21478 17082 16990 01/31/2022 19096 16140 16159 02/28/2022 18149 16059 16096 03/31/2022 17517 15928 15931 04/30/2022 15270 14464 14404 05/31/2022 15642 14928 14785 06/30/2022 14384 13682 13713 07/31/2022 15549 14564 14458 08/31/2022 14931 14128 14108 09/30/2022 13422 12812 12769 10/31/2022 13664 13135 13068 11/30/2022 15400 14452 14331 12/31/2022 14894 14447 14464 01/31/2023 15814 15331 15325 02/28/2023 15168 14726 14769 03/31/2023 15957 15381 15373 04/30/2023 15995 15490 15431 05/31/2023 16496 15628 15583 06/30/2023 17336 16202 16200 07/31/2023 17555 16751 16726 08/31/2023 17248 16371 16394 09/30/2023 16649 16113 16076 10/31/2023 16241 15470 15366 11/30/2023 17401 16679 16595 12/31/2023 18297 17335 17363 01/31/2024 18746 17878 18054 02/29/2024 20298 18502 18501 03/31/2024 21126 19097 19107 04/30/2024 20042 18245 18209 05/31/2024 20875 18445 18445 06/30/2024 21353 18313 18281 07/31/2024 22053 19439 19439 08/31/2024 22718 19663 19505 09/30/2024 22787 19723 19551 10/31/2024 21294 18799 18704
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Japan Fund 31.08% 4.50% 7.85% Russell/Nomura Total Market™ Index 21.52% 5.54% 6.52% TOPIX 21.72% 5.29% 6.46%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 413,607,966
Holdings Count | Holdings	27
Advisory Fees Paid, Amount	$ 3,059,845
Investment Company, Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $413,607,966 Number of Holdings 27 Annual Portfolio Turnover 17% Total Advisory Fee $3,059,845
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 2.59% Consumer Discretionary 9.10% Consumer Staples 10.40% Financials 26.10% Health Care 3.84% Industrials 23.90% Information Technology 10.99% Materials 6.72% Short-Term Investments and Other 5.74% Other Assets in Excess of Liabilities 0.71% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Japan Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Japan Fund
Class Name	Institutional Class
Trading Symbol	HJPIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $118 1.02%
Expenses Paid, Amount	$ 118
Expense Ratio, Percent	1.02%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one year period ended October 31, 2024, the Fund outperformed both the Russell/Nomura Total Market™ Index (the Fund’s primary benchmark) and the Tokyo Stock Price Index (TOPIX). Factors Influencing Performance Exposure to Financial and Industrial sectors contributed positively, while exposure to the Communication Service sector detracted from the Fund’s performance. Positive contributions were led by Insurance companies such as MS&AD Insurance Group Holdings, Inc., Tokio Marine Holdings, Inc., and Sompo Holdings, Inc. With pressure from the Japanese Financial Services Agency, these insurers have adopted plans for divesting certain strategic equity holdings, which has been positively received by the market. We believe that corporate governance reforms remain the biggest driver of the Japanese stock market.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Japan Fund Russell/Nomura Total Market™ Index Tokyo Stock Price Index (TOPIX) 10/31/2014 250000 250000 250000 11/30/2014 243228 248754 249846 12/31/2014 241196 245017 248154 01/31/2015 250226 250385 253538 02/28/2015 263093 266438 268308 03/31/2015 268172 270096 273077 04/30/2015 270542 282054 282462 05/31/2015 270993 285013 286154 06/30/2015 276637 281389 283231 07/31/2015 284086 281821 284769 08/31/2015 269074 267589 269692 09/30/2015 247178 249924 252308 10/31/2015 277088 274485 276615 11/30/2015 278668 273609 274615 12/31/2015 273138 273737 275385 01/31/2016 262415 253039 253846 02/29/2016 265011 245278 246769 03/31/2016 275282 258340 259846 04/30/2016 281264 266727 267692 05/31/2016 293905 267797 269692 06/30/2016 297630 262219 263538 07/31/2016 303386 275816 280154 08/31/2016 305192 278224 279077 09/30/2016 318849 285579 286154 10/31/2016 321106 289266 290308 11/30/2016 306546 283714 282462 12/31/2016 304966 282788 285538 01/31/2017 322460 292453 296462 02/28/2017 321219 298339 301077 03/31/2017 322348 298178 300615 04/30/2017 328781 303310 304308 05/31/2017 346050 311882 314000 06/30/2017 348307 317620 318154 07/31/2017 353950 323082 324923 08/31/2017 357336 323393 326154 09/30/2017 362190 331379 332615 10/31/2017 379684 347651 347538 11/30/2017 398081 355573 358154 12/31/2017 404387 359612 361385 01/31/2018 418958 376997 376923 02/28/2018 409809 368648 371231 03/31/2018 410260 363981 364923 04/30/2018 409696 365474 367231 05/31/2018 415456 361722 363692 06/30/2018 414214 352627 354000 07/31/2018 409131 354819 354923 08/31/2018 420201 353383 354615 09/30/2018 440081 364041 365385 10/31/2018 391622 330699 333231 11/30/2018 406194 334130 335385 12/31/2018 379373 307741 309692 01/31/2019 391951 328628 329692 02/28/2019 398523 330960 330769 03/31/2019 407475 331080 332923 04/30/2019 420392 334639 335846 05/31/2019 400903 321125 322462 06/30/2019 415407 333476 334000 07/31/2019 408948 334083 334462 08/31/2019 401696 328855 330615 09/30/2019 417106 344094 344308 10/31/2019 434783 358929 361385 11/30/2019 441015 362910 363692 12/31/2019 449601 369505 370615 01/31/2020 432523 361933 364769 02/29/2020 400531 325700 328923 03/31/2020 377191 306590 308923 04/30/2020 400872 326156 325385 05/31/2020 446527 346714 345012 06/30/2020 455749 345145 343877 07/31/2020 470094 342567 336763 08/31/2020 494003 364608 363211 09/30/2020 502656 369419 369729 10/31/2020 503111 363886 362645 11/30/2020 552409 406572 404068 12/31/2020 566679 421384 420200 01/31/2021 556431 418518 415346 02/28/2021 553471 425301 420872 03/31/2021 539808 429805 428942 04/30/2021 530358 425739 421675 05/31/2021 534115 427315 426789 06/30/2021 530699 429178 425652 07/31/2021 536734 422995 421085 08/31/2021 562124 435474 433991 09/30/2021 578634 446018 445934 10/31/2021 564060 433616 430172 11/30/2021 554154 420294 416406 12/31/2021 551379 427062 424749 01/31/2022 490449 403507 403985 02/28/2022 466285 401469 402408 03/31/2022 450214 398203 398265 04/30/2022 392637 361609 360109 05/31/2022 402233 373209 369620 06/30/2022 369976 342046 342825 07/31/2022 400152 364112 361457 08/31/2022 384312 353188 352692 09/30/2022 345580 320290 319223 10/31/2022 351824 328382 326711 11/30/2022 396683 361298 358277 12/31/2022 383734 361177 361602 01/31/2023 407667 383275 383120 02/28/2023 391018 368154 369226 03/31/2023 411482 384531 384325 04/30/2023 412639 387252 385782 05/31/2023 425703 390705 389577 06/30/2023 447439 405040 405012 07/31/2023 453336 418784 418162 08/31/2023 445590 409267 409860 09/30/2023 430212 402828 401898 10/31/2023 419922 386750 384160 11/30/2023 449983 416965 414875 12/31/2023 473318 433363 434063 01/31/2024 485099 446956 451342 02/29/2024 525473 462546 462515 03/31/2024 547071 477435 477686 04/30/2024 519092 456135 455215 05/31/2024 540935 461130 461128 06/30/2024 553575 457814 457020 07/31/2024 571860 485984 485968 08/31/2024 589286 491582 487626 09/30/2024 591249 493067 488769 10/31/2024 552593 469986 467606
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Japan Fund 31.59% 4.91% 8.25% Russell/Nomura Total Market™ Index 21.52% 5.54% 6.52% TOPIX 21.72% 5.29% 6.46%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 413,607,966
Holdings Count | Holdings	27
Advisory Fees Paid, Amount	$ 3,059,845
Investment Company, Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $413,607,966 Number of Holdings 27 Annual Portfolio Turnover 17% Total Advisory Fee $3,059,845
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 2.59% Consumer Discretionary 9.10% Consumer Staples 10.40% Financials 26.10% Health Care 3.84% Industrials 23.90% Information Technology 10.99% Materials 6.72% Short-Term Investments and Other 5.74% Other Assets in Excess of Liabilities 0.71% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Japan Small Cap Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Japan Small Cap Fund
Class Name	Investor Class
Trading Symbol	HJPSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $162 1.52%
Expenses Paid, Amount	$ 162
Expense Ratio, Percent	1.52%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one year period ended October 31, 2024, the Fund underperformed both the Russell/Nomura Small Cap™ Index (the Fund’s primary benchmark) and the Tokyo Stock Price Index (TOPIX). Factors Influencing Performance In January through March 2024, the Fund faced performance pressures from the strong broader market rally, which was driven primarily by large-cap companies, whereas the Fund had lower exposure due to its outsized allocation toward small-cap companies relative to the broader market. From March through September 2024, substantial shifts in the external environment, such as fluctuations in the yen and diminished expectations for rising interest rates, further weighed on the Fund’s performance, creating additional headwinds.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Japan Small Cap Fund Russell/Nomura Small Cap™ Index Tokyo Stock Price Index (TOPIX) 10/31/2014 10000 10000 10000 11/30/2014 9696 9816 9994 12/31/2014 9862 9866 9926 01/31/2015 10039 10101 10142 02/28/2015 10195 10526 10732 03/31/2015 10362 10656 10923 04/30/2015 10654 10992 11298 05/31/2015 11050 11070 11446 06/30/2015 11404 11228 11329 07/31/2015 11175 11205 11391 08/31/2015 10716 10882 10788 09/30/2015 10477 10452 10092 10/31/2015 10727 11139 11065 11/30/2015 10956 11345 10985 12/31/2015 11004 11395 11015 01/31/2016 10595 10622 10154 02/29/2016 10239 10417 9871 03/31/2016 11069 11188 10394 04/30/2016 11026 11490 10708 05/31/2016 11338 11649 10788 06/30/2016 11457 11539 10542 07/31/2016 11845 12100 11206 08/31/2016 11522 11752 11163 09/30/2016 12211 12442 11446 10/31/2016 12168 12671 11612 11/30/2016 11910 12245 11298 12/31/2016 11941 12277 11422 01/31/2017 12601 12704 11858 02/28/2017 13349 13181 12043 03/31/2017 13712 13167 12025 04/30/2017 13778 13456 12172 05/31/2017 14382 13867 12560 06/30/2017 14778 14236 12726 07/31/2017 15240 14588 12997 08/31/2017 15504 14833 13046 09/30/2017 15999 15216 13305 10/31/2017 16406 15790 13902 11/30/2017 17263 16215 14326 12/31/2017 17862 16615 14455 01/31/2018 18659 17375 15077 02/28/2018 18367 17066 14849 03/31/2018 18401 16967 14597 04/30/2018 18412 16979 14689 05/31/2018 18626 16893 14548 06/30/2018 18143 16460 14160 07/31/2018 18154 16378 14197 08/31/2018 18019 16154 14185 09/30/2018 18401 16432 14615 10/31/2018 16839 14745 13329 11/30/2018 17311 15145 13415 12/31/2018 15627 13604 12388 01/31/2019 16276 14353 13188 02/28/2019 16798 14625 13231 03/31/2019 16427 14508 13317 04/30/2019 16821 14625 13434 05/31/2019 16508 14015 12898 06/30/2019 17019 14427 13360 07/31/2019 17169 14521 13378 08/31/2019 16589 14139 13225 09/30/2019 17100 14745 13772 10/31/2019 17900 15535 14455 11/30/2019 18086 15806 14548 12/31/2019 18744 16099 14825 01/31/2020 17781 15392 14591 02/29/2020 15571 13355 13157 03/31/2020 14396 12801 12357 04/30/2020 15513 13650 13015 05/31/2020 17358 14753 13800 06/30/2020 17181 14485 13755 07/31/2020 16923 14190 13471 08/31/2020 17640 15176 14528 09/30/2020 18545 15850 14789 10/31/2020 18486 15434 14506 11/30/2020 20378 16339 16163 12/31/2020 21262 16898 16808 01/31/2021 20708 16759 16614 02/28/2021 20414 16889 16835 03/31/2021 21368 17409 17158 04/30/2021 20849 17177 16867 05/31/2021 20755 16962 17072 06/30/2021 20861 17279 17026 07/31/2021 21321 17145 16843 08/31/2021 21179 17557 17360 09/30/2021 21627 17816 17837 10/31/2021 21344 17255 17207 11/30/2021 19966 16229 16656 12/31/2021 20273 16423 16990 01/31/2022 18972 15482 16159 02/28/2022 19114 15748 16096 03/31/2022 17801 15116 15931 04/30/2022 16441 13891 14404 05/31/2022 16926 14215 14785 06/30/2022 16051 13443 13713 07/31/2022 16997 14275 14458 08/31/2022 16678 13966 14108 09/30/2022 15637 13018 12769 10/31/2022 15507 13039 13068 11/30/2022 17068 14238 14331 12/31/2022 16960 14489 14464 01/31/2023 18055 15152 15325 02/28/2023 17519 14627 14769 03/31/2023 18340 15189 15373 04/30/2023 18186 15288 15431 05/31/2023 17650 14868 15583 06/30/2023 18174 15221 16200 07/31/2023 18483 15919 16726 08/31/2023 18328 15777 16394 09/30/2023 18007 15472 16076 10/31/2023 17543 14908 15366 11/30/2023 18638 15922 16595 12/31/2023 19722 16719 17363 01/31/2024 19422 16678 18054 02/29/2024 19854 16991 18501 03/31/2024 20490 17475 19107 04/30/2024 19830 16664 18209 05/31/2024 19938 16643 18445 06/30/2024 20034 16536 18281 07/31/2024 21439 17790 19439 08/31/2024 21078 18060 19505 09/30/2024 21475 18487 19551 10/31/2024 19962 17412 18704
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Japan Small Cap Fund 13.79% 2.20% 7.16% Russell/Nomura Small Cap™ Index 16.80% 2.31% 5.70% TOPIX 21.72% 5.29% 6.46%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 109,181,957
Holdings Count | Holdings	66
Advisory Fees Paid, Amount	$ 902,610
Investment Company, Portfolio Turnover	28%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $109,181,957 Number of Holdings 66 Annual Portfolio Turnover 28% Total Advisory Fee $902,610
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 0.97% Consumer Discretionary 14.87% Consumer Staples 5.92% Energy 0.61% Financials 3.81% Health Care 5.39% Industrials 39.21% Information Technology 11.14% Materials 8.80% Real Estate 5.48% Utilities 0.52% Short-Term Investments and Other 2.60% Other Assets in Excess of Liabilities 0.68% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Japan Small Cap Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Japan Small Cap Fund
Class Name	Institutional Class
Trading Symbol	HJSIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $120 1.12%
Expenses Paid, Amount	$ 120
Expense Ratio, Percent	1.12%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one year period ended October 31, 2024, the Fund underperformed both the Russell/Nomura Small Cap™ Index (the Fund’s primary benchmark) and the Tokyo Stock Price Index (TOPIX). Factors Influencing Performance In January through March 2024, the Fund faced performance pressures from the strong broader market rally, which was driven primarily by large-cap companies, whereas the Fund had lower exposure due to its outsized allocation toward small-cap companies relative to the broader market. From March through September 2024, substantial shifts in the external environment, such as fluctuations in the yen and diminished expectations for rising interest rates, further weighed on the Fund’s performance, creating additional headwinds.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Japan Small Cap Fund Russell/Nomura Small Cap™ Index Tokyo Stock Price Index (TOPIX) 10/31/2014 250000 250000 250000 11/30/2014 242395 245405 249846 12/31/2014 246538 246662 248154 01/31/2015 250968 252516 253538 02/28/2015 254877 263143 268308 03/31/2015 259047 266407 273077 04/30/2015 266344 274802 282462 05/31/2015 276248 276746 286154 06/30/2015 285108 280708 283231 07/31/2015 279636 280137 284769 08/31/2015 268169 272049 269692 09/30/2015 262435 261312 252308 10/31/2015 268429 278464 276615 11/30/2015 274423 283617 274615 12/31/2015 275652 284873 275385 01/31/2016 265143 265552 253846 02/29/2016 256520 260426 246769 03/31/2016 277268 279706 259846 04/30/2016 276190 287240 267692 05/31/2016 284005 291228 269692 06/30/2016 286969 288470 263538 07/31/2016 296938 302490 280154 08/31/2016 289124 293796 279077 09/30/2016 306369 311060 286154 10/31/2016 305291 316786 290308 11/30/2016 298825 306131 282462 12/31/2016 299405 306914 285538 01/31/2017 316226 317595 296462 02/28/2017 335009 329529 301077 03/31/2017 344540 329167 300615 04/30/2017 345942 336404 304308 05/31/2017 361361 346685 314000 06/30/2017 371453 355897 318154 07/31/2017 382947 364700 324923 08/31/2017 389956 370827 326154 09/30/2017 402291 380398 332615 10/31/2017 412663 394751 347538 11/30/2017 434530 405375 358154 12/31/2017 449909 415364 361385 01/31/2018 470281 434387 376923 02/28/2018 462821 426650 371231 03/31/2018 463682 424167 364923 04/30/2018 464543 424465 367231 05/31/2018 469995 422333 363692 06/30/2018 457656 411500 354000 07/31/2018 458230 409447 354923 08/31/2018 455074 403861 354615 09/30/2018 464830 410795 365385 10/31/2018 425520 368629 333231 11/30/2018 437571 378614 335385 12/31/2018 395321 340099 309692 01/31/2019 411966 358830 329692 02/28/2019 425342 365613 330769 03/31/2019 416127 362694 332923 04/30/2019 426233 365625 335846 05/31/2019 418208 350374 322462 06/30/2019 431583 360684 334000 07/31/2019 435150 363019 334462 08/31/2019 420883 353481 330615 09/30/2019 433664 368623 344308 10/31/2019 454173 388387 361385 11/30/2019 458929 395153 363692 12/31/2019 476051 402467 370615 01/31/2020 451568 384792 364769 02/29/2020 395651 333884 328923 03/31/2020 366030 320037 308923 04/30/2020 394442 341254 325385 05/31/2020 441594 368821 345012 06/30/2020 437362 362113 343877 07/31/2020 430713 354760 336763 08/31/2020 449150 379402 363211 09/30/2020 472122 396244 369729 10/31/2020 470913 385855 362645 11/30/2020 519273 408486 404068 12/31/2020 542139 422462 420200 01/31/2021 528145 418982 415346 02/28/2021 520843 422224 420872 03/31/2021 545486 435237 428942 04/30/2021 532100 429432 421675 05/31/2021 529970 424045 426789 06/30/2021 533012 431979 425652 07/31/2021 544877 428614 421085 08/31/2021 541227 438916 433991 09/30/2021 553092 445404 445934 10/31/2021 545790 431379 430172 11/30/2021 510803 405724 416406 12/31/2021 518815 410575 424749 01/31/2022 485660 387061 403985 02/28/2022 489650 393688 402408 03/31/2022 455881 377901 398265 04/30/2022 421191 347287 360109 05/31/2022 433778 355382 369620 06/30/2022 411675 336076 342825 07/31/2022 435927 356871 361457 08/31/2022 427945 349141 352692 09/30/2022 401544 325439 319223 10/31/2022 398167 325968 326711 11/30/2022 438383 355954 358277 12/31/2022 435849 362215 361602 01/31/2023 464118 378789 383120 02/28/2023 450449 365686 369226 03/31/2023 471885 379719 384325 04/30/2023 467846 382190 385782 05/31/2023 454488 371688 389577 06/30/2023 467846 380532 405012 07/31/2023 476234 397966 418162 08/31/2023 472195 394435 409860 09/30/2023 463808 386806 401898 10/31/2023 452313 372691 384160 11/30/2023 480894 398060 414875 12/31/2023 508813 417978 434063 01/31/2024 501266 416952 451342 02/29/2024 512587 424778 462515 03/31/2024 528940 436887 477686 04/30/2024 512273 416597 455215 05/31/2024 515103 416067 461128 06/30/2024 517933 413394 457020 07/31/2024 554412 444748 485968 08/31/2024 545292 451490 487626 09/30/2024 555670 462165 488769 10/31/2024 516675 435298 467606
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Japan Small Cap Fund 14.23% 2.61% 7.53% Russell/Nomura Small Cap™ Index 16.80% 2.31% 5.70% TOPIX 21.72% 5.29% 6.46%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 109,181,957
Holdings Count | Holdings	66
Advisory Fees Paid, Amount	$ 902,610
Investment Company, Portfolio Turnover	28%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $109,181,957 Number of Holdings 66 Annual Portfolio Turnover 28% Total Advisory Fee $902,610
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 0.97% Consumer Discretionary 14.87% Consumer Staples 5.92% Energy 0.61% Financials 3.81% Health Care 5.39% Industrials 39.21% Information Technology 11.14% Materials 8.80% Real Estate 5.48% Utilities 0.52% Short-Term Investments and Other 2.60% Other Assets in Excess of Liabilities 0.68% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Large Cap Financial Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Large Cap Financial Fund
Class Name	Investor Class
Trading Symbol	HLFNX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $236 1.89%
Expenses Paid, Amount	$ 236
Expense Ratio, Percent	1.89%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund slightly outperformed the Russell 1000® Index Financials (the Fund’s primary benchmark) and significantly outperformed the Russell 1000® Index. Factors Influencing Performance ● Holdings in the Diversified Banks and Regional Banks sub-industries contributed the most to performance. ● Holdings in the Financial Exchanges & Data sub-industry detracted from performance. ● Stocks that contributed the most to performance included Wells Fargo & Company, M&T Bank Corporation, and KeyCorp. ● Stocks that detracted the most from performance included Flagstar Financial, Inc. and Coinbase Global, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Large Cap Financial Fund Russell 1000® Index Russell 1000® Index Financials 10/31/2014 10000 10000 10000 11/30/2014 10216 10262 10249 12/31/2014 10428 10238 10405 01/31/2015 9621 9957 9845 02/28/2015 10104 10532 10384 03/31/2015 10019 10401 10348 04/30/2015 10067 10475 10348 05/31/2015 10295 10612 10541 06/30/2015 10301 10413 10488 07/31/2015 10455 10613 10855 08/31/2015 9786 9975 10155 09/30/2015 9330 9702 9900 10/31/2015 9743 10486 10541 11/30/2015 10088 10521 10711 12/31/2015 9791 10332 10478 01/31/2016 8762 9776 9624 02/29/2016 8393 9772 9397 03/31/2016 8762 10453 10090 04/30/2016 9136 10510 10373 05/31/2016 9136 10694 10608 06/30/2016 8580 10718 10307 07/31/2016 8926 11127 10704 08/31/2016 9335 11141 11030 09/30/2016 9206 11150 10844 10/31/2016 9493 10933 10878 11/30/2016 10809 11364 11780 12/31/2016 11256 11577 12211 01/31/2017 11256 11810 12298 02/28/2017 11820 12267 12912 03/31/2017 11338 12275 12635 04/30/2017 11279 12405 12628 05/31/2017 11250 12563 12584 06/30/2017 11755 12651 13162 07/31/2017 12091 12901 13441 08/31/2017 11973 12942 13344 09/30/2017 12443 13217 13816 10/31/2017 12949 13520 14187 11/30/2017 13308 13933 14648 12/31/2017 13437 14088 14844 01/31/2018 14544 14861 15603 02/28/2018 14304 14316 15122 03/31/2018 13744 13991 14782 04/30/2018 13658 14038 14778 05/31/2018 13830 14397 14881 06/30/2018 13615 14490 14838 07/31/2018 14033 14990 15389 08/31/2018 14464 15506 15811 09/30/2018 14132 15565 15532 10/31/2018 13184 14464 14715 11/30/2018 13301 14758 15140 12/31/2018 11861 13414 13640 01/31/2019 12976 14538 14903 02/28/2019 13546 15030 15381 03/31/2019 13217 15292 15356 04/30/2019 14389 15910 16365 05/31/2019 13540 14896 15604 06/30/2019 14459 15942 16475 07/31/2019 15022 16189 16898 08/31/2019 14300 15893 16526 09/30/2019 14066 16168 16931 10/31/2019 14338 16511 17234 11/30/2019 15155 17135 17888 12/31/2019 15390 17629 18245 01/31/2020 15694 17649 18193 02/29/2020 14465 16206 16454 03/31/2020 11449 14065 13124 04/30/2020 12938 15923 14518 05/31/2020 13724 16763 15158 06/30/2020 13926 17134 15263 07/31/2020 14440 18137 15887 08/31/2020 15371 19469 16583 09/30/2020 15060 18757 15834 10/31/2020 14148 18305 15849 11/30/2020 16746 20460 18408 12/31/2020 17937 21325 19563 01/31/2021 17329 21150 19255 02/28/2021 19014 21763 21420 03/31/2021 19324 22586 22650 04/30/2021 20775 23802 24091 05/31/2021 20959 23915 25119 06/30/2021 20946 24514 24347 07/31/2021 21232 25023 24278 08/31/2021 22100 25748 25575 09/30/2021 21213 24565 25069 10/31/2021 22378 26269 27081 11/30/2021 21111 25917 25662 12/31/2021 21310 26967 26418 01/31/2022 20584 25446 26337 02/28/2022 19779 24748 25906 03/31/2022 18900 25583 25945 04/30/2022 16889 23303 23293 05/31/2022 17482 23267 24085 06/30/2022 15285 21319 21499 07/31/2022 16610 23304 23073 08/31/2022 16303 22409 22623 09/30/2022 14859 20336 20867 10/31/2022 16510 21967 23366 11/30/2022 17295 23155 24916 12/31/2022 16008 21809 23538 01/31/2023 17594 23271 25257 02/28/2023 17008 22717 24697 03/31/2023 13599 23436 22321 04/30/2023 13957 23726 22952 05/31/2023 13363 23837 22056 06/30/2023 14035 25447 23531 07/31/2023 15900 26322 25037 08/31/2023 14700 25861 24253 09/30/2023 14085 24646 23702 10/31/2023 13271 24050 23032 11/30/2023 15014 26296 25599 12/31/2023 16740 27595 27177 01/31/2024 16529 27979 27766 02/29/2024 16892 29490 29058 03/31/2024 18186 30436 30663 04/30/2024 17430 29141 29226 05/31/2024 17837 30513 30545 06/30/2024 17656 31523 30438 07/31/2024 19015 31981 32550 08/31/2024 19160 32740 33814 09/30/2024 18913 33440 33520 10/31/2024 19894 33206 34454
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Large Cap Financial Fund 49.91% 6.77% 7.12% Russell 1000® Index Financials 49.59% 14.86% 13.17% Russell 1000® Index 38.07% 15.00% 12.75%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 28,795,722
Holdings Count | Holdings	24
Advisory Fees Paid, Amount	$ 256,284
Investment Company, Portfolio Turnover	37%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $28,795,722 Number of Holdings 24 Annual Portfolio Turnover 37% Total Advisory Fee $256,284
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Financials 99.16% Short-Term Investments and Other 0.94% Liabilities in Excess of Other Assets -0.10% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Large Cap Financial Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Large Cap Financial Fund
Class Name	Institutional Class
Trading Symbol	HILFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $197 1.57%
Expenses Paid, Amount	$ 197
Expense Ratio, Percent	1.57%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund slightly outperformed the Russell 1000® Index Financials (the Fund’s primary benchmark) and significantly outperformed the Russell 1000® Index. Factors Influencing Performance ● Holdings in the Diversified Banks and Regional Banks sub-industries contributed the most to performance. ● Holdings in the Financial Exchanges & Data sub-industry detracted from performance. ● Stocks that contributed the most to performance included Wells Fargo & Company, M&T Bank Corporation, and KeyCorp. ● Stocks that detracted the most from performance included Flagstar Financial, Inc. and Coinbase Global, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Large Cap Financial Fund Russell 1000® Index Russell 1000® Index Financials 10/31/2014 250000 250000 250000 11/30/2014 255391 256545 256223 12/31/2014 260701 255948 260127 01/31/2015 240535 248917 246132 02/28/2015 252608 263300 259588 03/31/2015 250485 260021 258707 04/30/2015 251679 261867 258701 05/31/2015 257384 265293 263515 06/30/2015 257517 260316 262205 07/31/2015 261497 265334 271370 08/31/2015 244913 249373 253887 09/30/2015 233503 242538 247500 10/31/2015 243984 262162 263515 11/30/2015 252741 263028 267776 12/31/2015 245359 258296 261947 01/31/2016 219663 244393 240597 02/29/2016 210559 244309 234936 03/31/2016 219957 261328 252238 04/30/2016 229354 262749 259321 05/31/2016 229354 267351 265203 06/30/2016 215698 267956 257684 07/31/2016 224362 278164 267588 08/31/2016 234640 278533 275754 09/30/2016 231556 278754 271108 10/31/2016 238751 273318 271952 11/30/2016 271936 284093 294498 12/31/2016 283473 289430 305263 01/31/2017 283473 295250 307446 02/28/2017 297796 306679 322804 03/31/2017 285711 306873 315872 04/30/2017 284368 310117 315704 05/31/2017 283771 314075 314610 06/30/2017 296602 316268 329045 07/31/2017 305256 322531 336037 08/31/2017 302272 323540 333599 09/30/2017 314357 330430 345407 10/31/2017 326889 338008 354670 11/30/2017 336139 348316 366206 12/31/2017 339404 352199 371096 01/31/2018 367506 371533 390069 02/28/2018 361573 357893 378051 03/31/2018 347522 349769 369554 04/30/2018 345337 350958 369461 05/31/2018 349864 359917 372023 06/30/2018 344400 362244 370938 07/31/2018 355172 374746 384723 08/31/2018 366101 387658 395278 09/30/2018 357982 389130 388299 10/31/2018 334096 361594 367868 11/30/2018 337218 368953 378503 12/31/2018 300712 335350 341008 01/31/2019 329175 363453 372576 02/28/2019 343648 375759 384516 03/31/2019 335447 382301 383899 04/30/2019 365197 397740 409114 05/31/2019 343809 372394 390090 06/30/2019 367287 398538 411884 07/31/2019 381760 404727 422461 08/31/2019 363428 397314 413138 09/30/2019 357639 404201 423285 10/31/2019 364714 412767 430858 11/30/2019 385458 428367 447203 12/31/2019 391569 440737 456123 01/31/2020 399449 441213 454822 02/29/2020 368252 405158 411356 03/31/2020 291546 351617 328096 04/30/2020 329497 398080 362948 05/31/2020 349598 419084 378955 06/30/2020 354905 428351 381584 07/31/2020 367930 453434 397166 08/31/2020 391891 486715 414587 09/30/2020 384011 468926 395853 10/31/2020 360855 457618 396221 11/30/2020 427269 511506 460202 12/31/2020 457822 533130 489084 01/31/2021 442385 528739 481381 02/28/2021 485642 544063 535505 03/31/2021 493843 564652 566240 04/30/2021 530990 595047 602267 05/31/2021 535975 597872 627986 06/30/2021 535815 612853 608681 07/31/2021 543212 625584 606953 08/31/2021 565564 643690 639387 09/30/2021 543051 614123 626724 10/31/2021 572961 656735 677037 11/30/2021 540639 647925 641551 12/31/2021 545919 674170 660458 01/31/2022 527502 636160 658436 02/28/2022 507057 618703 647648 03/31/2022 484754 639581 648621 04/30/2022 433220 582568 582324 05/31/2022 448427 581683 602136 06/30/2022 392162 532967 537479 07/31/2022 426462 582607 576816 08/31/2022 418690 560237 565582 09/30/2022 381687 508400 521665 10/31/2022 424265 549174 584146 11/30/2022 444541 578883 622897 12/31/2022 411541 545222 588462 01/31/2023 452185 581776 631414 02/28/2023 437239 567932 617429 03/31/2023 349755 585898 558026 04/30/2023 359050 593158 573804 05/31/2023 343923 595921 551408 06/30/2023 361237 636168 588264 07/31/2023 409354 658044 625927 08/31/2023 378734 646533 606318 09/30/2023 362878 616149 592561 10/31/2023 341918 601257 575808 11/30/2023 387118 657411 639987 12/31/2023 431560 689865 679432 01/31/2024 426358 699486 694153 02/29/2024 435833 737259 726453 03/31/2024 469459 760894 766580 04/30/2024 449952 728516 730658 05/31/2024 460541 762821 763622 06/30/2024 455897 788068 760941 07/31/2024 491195 799537 813749 08/31/2024 495096 818489 845348 09/30/2024 488779 835989 838007 10/31/2024 514417 830148 861347
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Large Cap Financial Fund 50.45% 7.12% 7.48% Russell 1000® Index Financials 49.59% 14.86% 13.17% Russell 1000® Index 38.07% 15.00% 12.75%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 28,795,722
Holdings Count | Holdings	24
Advisory Fees Paid, Amount	$ 256,284
Investment Company, Portfolio Turnover	37%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $28,795,722 Number of Holdings 24 Annual Portfolio Turnover 37% Total Advisory Fee $256,284
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Financials 99.16% Short-Term Investments and Other 0.94% Liabilities in Excess of Other Assets -0.10% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Small Cap Financial Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Small Cap Financial Fund
Class Name	Investor Class
Trading Symbol	HSFNX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $197 1.62%
Expenses Paid, Amount	$ 197
Expense Ratio, Percent	1.62%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed the Russell 2000® Index Financials (the Fund’s primary benchmark) and outperformed the Russell 2000® Index. Factors Influencing Performance ● Holdings in the Regional Banks sub-industry contributed the most to performance. ● Stocks that contributed the most to performance included BankUnited, Inc., HomeTrust Bancshares, Inc., and Associated Banc-Corp. ● Stocks that detracted the most from performance included California BanCorp and Flagstar Financial, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Small Cap Financial Fund Russell 2000® Index Russell 2000® Index Financials 10/31/2014 10000 10000 10000 11/30/2014 9896 10009 9950 12/31/2014 10200 10294 10206 01/31/2015 9532 9963 9796 02/28/2015 10210 10555 10163 03/31/2015 10450 10738 10387 04/30/2015 10426 10465 10184 05/31/2015 10609 10703 10247 06/30/2015 11109 10784 10452 07/31/2015 11191 10658 10585 08/31/2015 10854 9989 9927 09/30/2015 11013 9498 9933 10/31/2015 11451 10034 10431 11/30/2015 12100 10360 10792 12/31/2015 11398 9840 10267 01/31/2016 10711 8975 9576 02/29/2016 10407 8974 9533 03/31/2016 10949 9690 10298 04/30/2016 11377 9842 10463 05/31/2016 11681 10064 10768 06/30/2016 11098 10058 10713 07/31/2016 11501 10658 11282 08/31/2016 12089 10847 11671 09/30/2016 12125 10968 11513 10/31/2016 12115 10446 11293 11/30/2016 14086 11611 12682 12/31/2016 15206 11936 13464 01/31/2017 14705 11984 13269 02/28/2017 14863 12215 13618 03/31/2017 14443 12231 13340 04/30/2017 14327 12365 13385 05/31/2017 13855 12113 12933 06/30/2017 14455 12532 13539 07/31/2017 14507 12625 13654 08/31/2017 13949 12465 13288 09/30/2017 15095 13243 14101 10/31/2017 15148 13355 14183 11/30/2017 15666 13740 14588 12/31/2017 15175 13685 14242 01/31/2018 15591 14042 14442 02/28/2018 15238 13499 13736 03/31/2018 15232 13673 14046 04/30/2018 15333 13792 14202 05/31/2018 16025 14629 14946 06/30/2018 15830 14734 14972 07/31/2018 15710 14990 15247 08/31/2018 15874 15637 15601 09/30/2018 15169 15260 15058 10/31/2018 13816 13603 13900 11/30/2018 14257 13819 14347 12/31/2018 12768 12178 12700 01/31/2019 13771 13548 14035 02/28/2019 14754 14252 14644 03/31/2019 13535 13954 14115 04/30/2019 14417 14428 14800 05/31/2019 13508 13306 13975 06/30/2019 14330 14246 14671 07/31/2019 14511 14328 14850 08/31/2019 13387 13621 14258 09/30/2019 13939 13904 14855 10/31/2019 14545 14270 15239 11/30/2019 14848 14858 15528 12/31/2019 15306 15286 15775 01/31/2020 14373 14796 15294 02/29/2020 13174 13550 13873 03/31/2020 9482 10606 10374 04/30/2020 10590 12063 11221 05/31/2020 10325 12848 11249 06/30/2020 10666 13302 11705 07/31/2020 10325 13670 11616 08/31/2020 10659 14441 12115 09/30/2020 9984 13958 11431 10/31/2020 12164 14251 12515 11/30/2020 14317 16877 14279 12/31/2020 15701 18337 15467 01/31/2021 16270 19260 15458 02/28/2021 19090 20460 17295 03/31/2021 20461 20666 18451 04/30/2021 21340 21100 18897 05/31/2021 22050 21143 19318 06/30/2021 20602 21553 18682 07/31/2021 19835 20775 18276 08/31/2021 21080 21239 19029 09/30/2021 21473 20613 18958 10/31/2021 22163 21490 20061 11/30/2021 21860 20594 19464 12/31/2021 22413 21055 20099 01/31/2022 22498 19028 19418 02/28/2022 22740 19231 19485 03/31/2022 21370 19470 18819 04/30/2022 19453 17540 17020 05/31/2022 20219 17567 17608 06/30/2022 18579 16122 16335 07/31/2022 20305 17805 17900 08/31/2022 19943 17441 17352 09/30/2022 19076 15769 16070 10/31/2022 20922 17506 18092 11/30/2022 21391 17914 18399 12/31/2022 19911 16752 16989 01/31/2023 20685 18384 17942 02/28/2023 20785 18074 17977 03/31/2023 16749 17210 15508 04/30/2023 15774 16901 15014 05/31/2023 14692 16745 14214 06/30/2023 15836 18106 15302 07/31/2023 18914 19213 17420 08/31/2023 17468 18252 16228 09/30/2023 16625 17178 15444 10/31/2023 15790 16006 14917 11/30/2023 17568 17455 16463 12/31/2023 20823 19588 19069 01/31/2024 19858 18826 18102 02/29/2024 18658 19890 18016 03/31/2024 19282 20602 18717 04/30/2024 17879 19152 17525 05/31/2024 18504 20113 18332 06/30/2024 18869 19927 18491 07/31/2024 22380 21952 21564 08/31/2024 22469 21624 21631 09/30/2024 22185 21775 21412 10/31/2024 22607 21460 21687
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Small Cap Financial Fund 43.17% 9.22% 8.50% Russell 2000® Index Financials 45.38% 7.31% 8.05% Russell 2000® Index 34.07% 8.50% 7.94%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 87,201,263
Holdings Count | Holdings	34
Advisory Fees Paid, Amount	$ 658,265
Investment Company, Portfolio Turnover	54%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $87,201,263 Number of Holdings 34 Annual Portfolio Turnover 54% Total Advisory Fee $658,265
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Financials 97.87% Short-Term Investments and Other 2.25% Liabilities in Excess of Other Assets -0.12% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Small Cap Financial Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Small Cap Financial Fund
Class Name	Institutional Class
Trading Symbol	HISFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $156 1.28%
Expenses Paid, Amount	$ 156
Expense Ratio, Percent	1.28%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed the Russell 2000® Index Financials (the Fund’s primary benchmark) and outperformed the Russell 2000® Index. Factors Influencing Performance ● Holdings in the Regional Banks sub-industry contributed the most to performance. ● Stocks that contributed the most to performance included BankUnited, Inc., HomeTrust Bancshares, Inc., and Associated Banc-Corp. ● Stocks that detracted the most from performance included California BanCorp and Flagstar Financial, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Small Cap Financial Fund Russell 2000® Index Russell 2000® Index Financials 10/31/2014 250000 250000 250000 11/30/2014 247591 250224 248750 12/31/2014 255130 257355 255148 01/31/2015 238560 249077 244890 02/28/2015 255529 263864 254067 03/31/2015 261718 268461 259663 04/30/2015 261119 261614 254600 05/31/2015 265910 267587 256177 06/30/2015 278487 269591 261288 07/31/2015 280483 266458 264615 08/31/2015 272099 249713 248169 09/30/2015 276291 237462 248324 10/31/2015 287470 250840 260770 11/30/2015 303641 259000 269809 12/31/2015 286257 245996 256676 01/31/2016 269103 224364 239391 02/29/2016 261384 224354 238323 03/31/2016 275107 242260 257444 04/30/2016 286043 246062 261563 05/31/2016 293762 251605 269200 06/30/2016 279181 251446 267822 07/31/2016 289474 266459 282050 08/31/2016 304269 271171 291781 09/30/2016 305341 274192 287826 10/31/2016 305127 261157 282315 11/30/2016 354873 290279 317057 12/31/2016 383356 298412 336609 01/31/2017 370903 299589 331728 02/28/2017 375054 305371 340450 03/31/2017 364311 305771 333506 04/30/2017 361625 309124 334627 05/31/2017 349904 302835 323318 06/30/2017 365043 313304 338482 07/31/2017 366508 315631 341356 08/31/2017 352590 311616 332192 09/30/2017 381647 331063 352529 10/31/2017 383112 333885 354568 11/30/2017 396298 343508 364705 12/31/2017 383872 342121 356062 01/31/2018 394703 351062 361041 02/28/2018 385985 337469 343391 03/31/2018 385985 341833 351157 04/30/2018 388627 344789 355047 05/31/2018 406328 365718 373655 06/30/2018 401308 368338 374291 07/31/2018 398402 374758 381180 08/31/2018 402629 390914 390034 09/30/2018 385193 381511 376456 10/31/2018 350848 340073 347510 11/30/2018 362208 345478 358686 12/31/2018 324527 304440 317494 01/31/2019 350042 338689 350878 02/28/2019 374983 356297 366106 03/31/2019 344308 348840 352880 04/30/2019 366956 360690 370005 05/31/2019 343734 332639 349372 06/30/2019 364662 356149 366768 07/31/2019 369536 358199 371249 08/31/2019 340868 340513 356446 09/30/2019 355202 347598 371369 10/31/2019 370396 356753 380969 11/30/2019 378423 371438 388205 12/31/2019 390099 382148 394366 01/31/2020 366412 369892 382352 02/29/2020 336127 338754 346834 03/31/2020 241976 265155 259339 04/30/2020 270161 301575 280527 05/31/2020 263564 321200 281223 06/30/2020 272260 332553 292634 07/31/2020 263564 341758 290402 08/31/2020 272260 361014 302873 09/30/2020 254869 348955 285783 10/31/2020 310940 356263 312881 11/30/2020 366112 421931 356984 12/31/2020 401446 458428 386663 01/31/2021 416144 481498 386459 02/28/2021 488717 511507 432376 03/31/2021 523932 516644 461265 04/30/2021 546591 527493 472432 05/31/2021 564964 528581 482961 06/30/2021 527912 538822 467041 07/31/2021 508621 519366 456892 08/31/2021 540467 530983 475732 09/30/2021 550878 515327 473938 10/31/2021 568639 537249 501522 11/30/2021 561290 514862 486594 12/31/2021 575573 526363 502480 01/31/2022 577762 475688 485449 02/28/2022 584327 480766 487128 03/31/2022 549311 486750 470465 04/30/2022 499914 438508 425497 05/31/2022 519923 439171 440188 06/30/2022 478029 403052 408387 07/31/2022 522424 445132 447496 08/31/2022 513357 436023 433795 09/30/2022 491160 394237 401750 10/31/2022 538994 437638 452298 11/30/2022 551187 447860 459986 12/31/2022 513160 418793 424729 01/31/2023 533175 459611 448551 02/28/2023 535936 451848 449421 03/31/2023 432062 430259 387690 04/30/2023 406870 422523 375354 05/31/2023 379262 418620 355354 06/30/2023 408940 452655 382546 07/31/2023 488313 480336 435501 08/31/2023 451042 456306 405703 09/30/2023 429646 429442 386107 10/31/2023 407905 400155 372932 11/30/2023 454148 436372 411579 12/31/2023 538338 489690 476736 01/31/2024 513633 470644 452547 02/29/2024 482660 497255 450391 03/31/2024 498884 515056 467920 04/30/2024 462749 478805 438137 05/31/2024 478973 502826 458289 06/30/2024 488560 498174 462273 07/31/2024 579635 548789 539090 08/31/2024 582216 540591 540778 09/30/2024 574842 544369 535292 10/31/2024 585903 536506 542171
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Small Cap Financial Fund 43.64% 9.61% 8.89% Russell 2000® Index Financials 45.38% 7.31% 8.05% Russell 2000® Index 34.07% 8.50% 7.94%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 87,201,263
Holdings Count | Holdings	34
Advisory Fees Paid, Amount	$ 658,265
Investment Company, Portfolio Turnover	54%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $87,201,263 Number of Holdings 34 Annual Portfolio Turnover 54% Total Advisory Fee $658,265
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Financials 97.87% Short-Term Investments and Other 2.25% Liabilities in Excess of Other Assets -0.12% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Technology Fund - Investor Class
Shareholder Report [Line Items]
Fund Name	Hennessy Technology Fund
Class Name	Investor Class
Trading Symbol	HTECX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $142 1.23%
Expenses Paid, Amount	$ 142
Expense Ratio, Percent	1.23%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the Nasdaq Composite Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in the Semiconductors, Systems Software, and Application Software industries contributed the most to performance. ● Holdings in the Electronic Components industry detracted the most from performance. ● Stocks that contributed the most to performance included NVIDIA Corp., Cellebrite DI Ltd., and Commvault Systems, Inc. ● Stocks that detracted the most from performance included Super Micro Computer, Inc., Qualys, Inc., and Viasat, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Technology Fund S&P 500® Index Nasdaq Composite Index 10/31/2014 10000 10000 10000 11/30/2014 10155 10269 10366 12/31/2014 9913 10243 10252 01/31/2015 9731 9936 10039 02/28/2015 10336 10507 10767 03/31/2015 10175 10340 10641 04/30/2015 10283 10440 10732 05/31/2015 10525 10574 11029 06/30/2015 10276 10369 10857 07/31/2015 10518 10586 11170 08/31/2015 9697 9948 10422 09/30/2015 9361 9702 10087 10/31/2015 10336 10520 11039 11/30/2015 10417 10551 11180 12/31/2015 10256 10385 10966 01/31/2016 9280 9869 10109 02/29/2016 9206 9856 10006 03/31/2016 9758 10525 10700 04/30/2016 9798 10566 10498 05/31/2016 10114 10755 10899 06/30/2016 9899 10783 10675 07/31/2016 10518 11181 11385 08/31/2016 10707 11196 11519 09/30/2016 10962 11199 11744 10/31/2016 10646 10994 11478 11/30/2016 10485 11401 11799 12/31/2016 10464 11627 11939 01/31/2017 10962 11847 12458 02/28/2017 11319 12318 12945 03/31/2017 11218 12332 13148 04/30/2017 11265 12459 13456 05/31/2017 11642 12634 13815 06/30/2017 11649 12713 13695 07/31/2017 12059 12974 14164 08/31/2017 11891 13014 14367 09/30/2017 12147 13283 14526 10/31/2017 12423 13593 15051 11/30/2017 12544 14009 15403 12/31/2017 12578 14165 15477 01/31/2018 13420 14976 16623 02/28/2018 13516 14424 16334 03/31/2018 13412 14058 15878 04/30/2018 13420 14112 15890 05/31/2018 14003 14451 16764 06/30/2018 13626 14540 16927 07/31/2018 13929 15081 17298 08/31/2018 15229 15573 18311 09/30/2018 14867 15662 18182 10/31/2018 13324 14591 16516 11/30/2018 13457 14888 16597 12/31/2018 12348 13544 15038 01/31/2019 14021 14629 16509 02/28/2019 15006 15099 17103 03/31/2019 14947 15393 17565 04/30/2019 15941 16016 18403 05/31/2019 14038 14998 16970 06/30/2019 15227 16055 18245 07/31/2019 15737 16286 18638 08/31/2019 15219 16028 18180 09/30/2019 15567 16328 18277 10/31/2019 16051 16681 18956 11/30/2019 16892 17287 19836 12/31/2019 17177 17809 20556 01/31/2020 17072 17802 20972 02/29/2020 15519 16336 19658 03/31/2020 13347 14319 17687 04/30/2020 15223 16154 20426 05/31/2020 16086 16923 21835 06/30/2020 16819 17260 23160 07/31/2020 17351 18233 24748 08/31/2020 18468 19544 27148 09/30/2020 18145 18801 25763 10/31/2020 17883 18301 25181 11/30/2020 21207 20305 28179 12/31/2020 22842 21085 29789 01/31/2021 22833 20872 30218 02/28/2021 24107 21448 30523 03/31/2021 24879 22387 30669 04/30/2021 25390 23582 32335 05/31/2021 25313 23747 31869 06/30/2021 26336 24301 33636 07/31/2021 26268 24878 34036 08/31/2021 26693 25635 35426 09/30/2021 25168 24443 33560 10/31/2021 25950 26155 36007 11/30/2021 25187 25974 36127 12/31/2021 25895 27138 36395 01/31/2022 23846 25734 33134 02/28/2022 23060 24963 32024 03/31/2022 23111 25890 33139 04/30/2022 20624 23632 28752 05/31/2022 20701 23676 28196 06/30/2022 18484 21721 25756 07/31/2022 20469 23724 28946 08/31/2022 19683 22757 27635 09/30/2022 17543 20661 24749 10/31/2022 19090 22334 25723 11/30/2022 20482 23582 26883 12/31/2022 19091 22223 24554 01/31/2023 21116 23619 27187 02/28/2023 20974 23043 26914 03/31/2023 22032 23889 28739 04/30/2023 20445 24262 28758 05/31/2023 22393 24367 30462 06/30/2023 24005 25977 32490 07/31/2023 24470 26812 33814 08/31/2023 23851 26385 33119 09/30/2023 22754 25127 31210 10/31/2023 21851 24599 30350 11/30/2023 24238 26845 33638 12/31/2023 25953 28065 35514 01/31/2024 26082 28536 35885 02/29/2024 27346 30060 38117 03/31/2024 27772 31027 38822 04/30/2024 26301 29760 37121 05/31/2024 27488 31236 39713 06/30/2024 28894 32356 42108 07/31/2024 29449 32750 41802 08/31/2024 29436 33545 42109 09/30/2024 29449 34261 43270 10/31/2024 28739 33950 43056
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Technology Fund 31.52% 12.36% 11.13% Nasdaq Composite Index 41.87% 17.83% 15.72% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 7,893,487
Holdings Count | Holdings	60
Advisory Fees Paid, Amount	$ 57,066
Investment Company, Portfolio Turnover	84%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $7,893,487 Number of Holdings 60 Annual Portfolio Turnover 84% Total Advisory Fee $57,066
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 8.28% Information Technology 88.96% Short-Term Investments and Other 2.92% Liabilities in Excess of Other Assets -0.16% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Technology Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Hennessy Technology Fund
Class Name	Institutional Class
Trading Symbol	HTCIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyfunds.com/funds/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyfunds.com/funds/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $114 0.98%
Expenses Paid, Amount	$ 114
Expense Ratio, Percent	0.98%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed both the Nasdaq Composite Index (the Fund’s primary benchmark) and the S&P 500® Index. Factors Influencing Performance ● Holdings in the Semiconductors, Systems Software, and Application Software industries contributed the most to performance. ● Holdings in the Electronic Components industry detracted the most from performance. ● Stocks that contributed the most to performance included NVIDIA Corp., Cellebrite DI Ltd., and Commvault Systems, Inc. ● Stocks that detracted the most from performance included Super Micro Computer, Inc., Qualys, Inc., and Viasat, Inc.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $250,000 Investment Date Hennessy Technology Fund S&P 500® Index Nasdaq Composite Index 10/31/2014 250000 250000 250000 11/30/2014 253828 256724 259145 12/31/2014 247836 256077 256312 01/31/2015 243509 248390 250968 02/28/2015 258655 262665 269167 03/31/2015 254660 258511 266024 04/30/2015 257490 260991 268311 05/31/2015 263648 264347 275725 06/30/2015 257490 259230 271430 07/31/2015 263648 264661 279252 08/31/2015 243176 248693 260538 09/30/2015 234687 242540 252187 10/31/2015 259321 262999 275986 11/30/2015 261485 263781 279507 12/31/2015 257490 259621 274159 01/31/2016 233189 246737 252731 02/29/2016 231358 246404 250140 03/31/2016 245173 263120 267497 04/30/2016 246338 264140 262442 05/31/2016 254328 268883 272483 06/30/2016 248835 269580 266872 07/31/2016 264647 279519 284619 08/31/2016 269308 279912 287964 09/30/2016 275965 279965 293608 10/31/2016 268142 274858 286938 11/30/2016 264148 285037 294972 12/31/2016 263648 290671 298469 01/31/2017 276298 296184 311438 02/28/2017 285453 307944 323615 03/31/2017 282956 308304 328695 04/30/2017 284121 311470 336406 05/31/2017 293775 315853 345378 06/30/2017 293941 317824 342384 07/31/2017 304427 324360 354098 08/31/2017 300100 325353 359178 09/30/2017 306758 332064 363147 10/31/2017 313748 339813 376268 11/30/2017 316744 350235 385085 12/31/2017 317866 354129 386928 01/31/2018 339240 374404 415566 02/28/2018 341614 360605 408348 03/31/2018 339057 351441 396938 04/30/2018 339240 352789 397248 05/31/2018 354037 361285 419090 06/30/2018 344720 363509 423185 07/31/2018 352393 377036 432462 08/31/2018 385458 389322 457774 09/30/2018 376324 391538 454551 10/31/2018 337413 364776 412903 11/30/2018 340884 372210 414936 12/31/2018 312772 338603 375939 01/31/2019 355203 365737 412726 02/28/2019 380200 377480 427574 03/31/2019 378940 384815 439123 04/30/2019 403936 400396 460085 05/31/2019 355834 374952 424262 06/30/2019 386292 401377 456115 07/31/2019 399315 407146 465943 08/31/2019 386081 400696 454489 09/30/2019 394904 408194 456928 10/31/2019 407507 417035 473890 11/30/2019 428723 432173 495902 12/31/2019 436269 445217 513888 01/31/2020 433678 445042 524306 02/29/2020 394175 408407 491449 03/31/2020 339128 357963 442176 04/30/2020 386835 403852 510659 05/31/2020 409070 423087 545866 06/30/2020 427418 431501 579010 07/31/2020 441234 455831 618697 08/31/2020 469513 488596 678704 09/30/2020 461525 470031 644077 10/31/2020 455049 457531 629537 11/30/2020 539670 507614 704486 12/31/2020 581379 527131 744717 01/31/2021 581379 521809 755453 02/28/2021 613944 536198 763087 03/31/2021 633578 559681 766714 04/30/2021 646748 589551 808373 05/31/2021 644832 593669 796718 06/30/2021 671172 607528 840904 07/31/2021 669735 621959 850903 08/31/2021 680510 640871 885641 09/30/2021 641959 611064 838989 10/31/2021 662073 653876 900181 11/30/2021 642677 649345 903186 12/31/2021 660799 678446 909874 01/31/2022 608665 643339 828358 02/28/2022 588834 624076 800611 03/31/2022 590114 647248 828482 04/30/2022 526784 590807 718791 05/31/2022 529023 591891 704890 06/30/2022 472411 543034 643908 07/31/2022 523266 593104 723659 08/31/2022 503116 568916 690869 09/30/2022 448422 516520 618713 10/31/2022 488083 558338 643081 11/30/2022 523906 589540 672080 12/31/2022 488517 555574 613843 01/31/2023 540261 590483 679673 02/28/2023 536725 576076 672841 03/31/2023 564044 597226 718476 04/30/2023 523548 606548 718950 05/31/2023 573364 609184 761559 06/30/2023 614824 649436 812238 07/31/2023 626715 670299 845346 08/31/2023 610967 659627 827980 09/30/2023 583006 628177 780245 10/31/2023 560187 614969 758746 11/30/2023 621252 671131 840942 12/31/2023 665604 701621 887855 01/31/2024 669139 713411 897122 02/29/2024 701600 751504 952928 03/31/2024 712527 775684 970539 04/30/2024 675246 744001 928022 05/31/2024 705778 780892 992825 06/30/2024 742095 808912 1052711 07/31/2024 756558 818759 1045052 08/31/2024 756236 838619 1052737 09/30/2024 756879 856530 1081751 10/31/2024 738560 848762 1076404
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year 5 Year 10 Year Hennessy Technology Fund 31.84% 12.63% 11.44% Nasdaq Composite Index 41.87% 17.83% 15.72% S&P 500® Index 38.02% 15.27% 13.00%
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 7,893,487
Holdings Count | Holdings	60
Advisory Fees Paid, Amount	$ 57,066
Investment Company, Portfolio Turnover	84%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024 ) Fund Size $7,893,487 Number of Holdings 60 Annual Portfolio Turnover 84% Total Advisory Fee $57,066
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 8.28% Information Technology 88.96% Short-Term Investments and Other 2.92% Liabilities in Excess of Other Assets -0.16% Sector sub-classifications may differ from those utilized for compliance purposes.
Hennessy Stance ESG ETF
Shareholder Report [Line Items]
Fund Name	Hennessy Stance ESG ETF
Class Name	Hennessy Stance ESG ETF
Trading Symbol	STNC
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.hennessyetfs.com/etfs/regulatory-documents 1-800-966-4354 fundsinfo hennessyfunds.com
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-800-966-4354
Additional Information Email	fundsinfo@hennessyfunds.com
Additional Information Website	https://www.hennessyetfs.com/etfs/regulatory-documents
Expenses [Text Block]	What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Hennessy Stance ESG ETF $97 0.85%
Expenses Paid, Amount	$ 97
Expense Ratio, Percent	0.85%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? For the one-year period ended October 31, 2024, the Fund underperformed the S&P 500® Index. Factors Influencing Performance The largest driver of the Fund’s underperformance relative to the S&P 500® Index was the Fund having less exposure to mega-cap names that have been large contributors to benchmark performance. The Fund has a targeted maximum position size in a single security of 3.5%, whereas the “Magnificent Seven”stocks (Microsoft, Tesla, Facebook (Meta), Apple, Amazon, NVIDIA, and Google (Alphabet)) comprised more than 31% of the S&P 500® Index by weight as of October 31, 2024.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	How did the Fund perform over the last 10 years? Change in Value of $10,000 Investment Date Hennessy Stance ESG ETF S&P 500® Index 03/15/2021 10000 10000 04/30/2021 10043 10549 07/31/2021 10802 11129 10/31/2021 11116 11700 01/31/2022 10899 11512 04/30/2022 10304 10572 07/31/2022 10351 10613 10/31/2022 10294 9991 01/31/2023 10684 10566 04/30/2023 10796 10853 07/31/2023 10942 11994 10/31/2023 9677 11004 01/31/2024 11374 12766 04/30/2024 11691 13313 07/31/2024 12136 14651 10/31/2024 12405 15188
Average Annual Return [Table Text Block]	Average Annual Total Returns for Periods Ended October 31, 2024 1 Year SinceInception ( 3/15/21 Hennessy Stance ESG ETF - NAV 28.18% 6.17% S&P 500® Index 38.02% 12.20%
Performance Inception Date	Mar. 15, 2021
No Deduction of Taxes [Text Block]	Fund performance in the graph and table assumes the reinvestment of dividends and capital gains and does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Net Assets	$ 99,824,552
Holdings Count | Holdings	36
Advisory Fees Paid, Amount	$ 905,589
Investment Company, Portfolio Turnover	291%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October31,2024 ) Fund Size $99,824,552 Number of Holdings 36 Annual Portfolio Turnover 291% Total Advisory Fee $905,589
Holdings [Text Block]	Sector Breakdown (% of net assets) sector breakdown (%) Communication Services 6.50% Consumer Discretionary 20.05% Consumer Staples 3.31% Financials 19.98% Health Care 21.89% Industrials 11.98% Information Technology 9.43% Materials 1.54% Utilities 4.95% Short-Term Investments and Other 0.35% Other Assets in Excess of Liabilities 0.02% Sector sub-classifications may differ from those utilized for compliance purposes.
Material Fund Change [Text Block]	Material Fund Changes This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available by February 28, 2025, at https://www.hennessyetfs.com/etfs/regulatory-documents or upon request at fundsinfo hennessyfunds.com or by calling 1-800-966-4354. On October 24, 2023, and January 31, 2024, respectively, the Fund acquired the net assets of CCM Small/Mid-Cap Impact Value Fund and CCM Core Impact Equity Fund (together, the “CCM Funds”) in the amounts of $12,436,393 and $49,220,453 and issued 490,155 and 2,015,987 shares of the Fund to prior shareholders of the CCM Funds in a non-taxable reorganization. The CCM Funds and the Fund have substantially similar investment objectives. Effective as of April 22, 2024, Austin Wen, CFA, replaced Ryan Dofflemeyer as a Portfolio Manager of the Fund. Effective as of December 18, 2024, the exchange on which shares of the Fund trade changed from NYSE Arca, Inc. to The Nasdaq Stock Market LLC.
Material Fund Change Adviser [Text Block]	Effective as of April 22, 2024, Austin Wen, CFA, replaced Ryan Dofflemeyer as a Portfolio Manager of the Fund.
[1]Due to the timing of the Fund's annual rebalance, the Fund held more than 30 securities at year end.[2]Due to the timing of the Fund's annual rebalance, the Fund held more than 30 securities at year end.

Shareholder Report, Line Graph

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	Mar. 15, 2021	Oct. 31, 2014	Nov. 30, 2014	Apr. 30, 2021	Dec. 31, 2014	Jan. 31, 2015	Feb. 28, 2015	Jul. 31, 2021	Mar. 31, 2015	Apr. 30, 2015	May 31, 2015	Oct. 31, 2021	Jun. 30, 2015	Jul. 31, 2015	Aug. 31, 2015	Jan. 31, 2022	Sep. 30, 2015	Oct. 31, 2015	Nov. 30, 2015	Apr. 30, 2022	Dec. 31, 2015	Jan. 31, 2016	Feb. 29, 2016	Jul. 31, 2022	Mar. 31, 2016	Apr. 30, 2016	May 31, 2016	Oct. 31, 2022	Jun. 30, 2016	Jul. 31, 2016	Aug. 31, 2016	Jan. 31, 2023	Sep. 30, 2016	Oct. 31, 2016	Nov. 30, 2016	Apr. 30, 2023	Dec. 31, 2016	Jan. 31, 2017	Feb. 28, 2017	Jul. 31, 2023	Mar. 31, 2017	Apr. 30, 2017	May 31, 2017	Oct. 31, 2023	Jun. 30, 2017	Jul. 31, 2017	Aug. 31, 2017	Jan. 31, 2024	Sep. 30, 2017	Oct. 31, 2017	Nov. 30, 2017	Apr. 30, 2024	Dec. 31, 2017	Jan. 31, 2018	Feb. 28, 2018	Jul. 31, 2024	Mar. 31, 2018	Apr. 30, 2018	May 31, 2018	Oct. 31, 2024	Jun. 30, 2018	Jul. 31, 2018	Aug. 31, 2018	Sep. 30, 2018	Oct. 31, 2018	Nov. 30, 2018	Dec. 31, 2018	Jan. 31, 2019	Feb. 28, 2019	Mar. 31, 2019	Apr. 30, 2019	May 31, 2019	Jun. 30, 2019	Jul. 31, 2019	Aug. 31, 2019	Sep. 30, 2019	Oct. 31, 2019	Nov. 30, 2019	Dec. 31, 2019	Jan. 31, 2020	Feb. 29, 2020	Mar. 31, 2020	Apr. 30, 2020	May 31, 2020	Jun. 30, 2020	Jul. 31, 2020	Aug. 31, 2020	Sep. 30, 2020	Oct. 31, 2020	Nov. 30, 2020	Dec. 31, 2020	Jan. 31, 2021	Feb. 28, 2021	Mar. 31, 2021	Apr. 30, 2021	May 31, 2021	Jun. 30, 2021	Jul. 31, 2021	Aug. 31, 2021	Sep. 30, 2021	Oct. 31, 2021	Nov. 30, 2021	Dec. 31, 2021	Jan. 31, 2022	Feb. 28, 2022	Mar. 31, 2022	Apr. 30, 2022	May 31, 2022	Jun. 30, 2022	Jul. 31, 2022	Aug. 31, 2022	Sep. 30, 2022	Oct. 31, 2022	Nov. 30, 2022	Dec. 31, 2022	Jan. 31, 2023	Feb. 28, 2023	Mar. 31, 2023	Apr. 30, 2023	May 31, 2023	Jun. 30, 2023	Jul. 31, 2023	Aug. 31, 2023	Sep. 30, 2023	Oct. 31, 2023	Nov. 30, 2023	Dec. 31, 2023	Jan. 31, 2024	Feb. 29, 2024	Mar. 31, 2024	Apr. 30, 2024	May 31, 2024	Jun. 30, 2024	Jul. 31, 2024	Aug. 31, 2024	Sep. 30, 2024	Oct. 31, 2024
Hennessy Cornerstone Growth Fund - Investor Class
Account Value [Line Items]
Accumulated Value		$ 10,000	$ 10,203		$ 10,359	$ 10,075	$ 10,755		$ 10,857	$ 10,364	$ 10,658		$ 10,771	$ 10,964	$ 10,401		$ 10,203	$ 10,707	$ 10,605		$ 10,246	$ 9,517	$ 9,775		$ 10,219	$ 9,951	$ 10,096		$ 10,262	$ 10,739	$ 10,589		$ 10,605	$ 10,171	$ 11,071		$ 11,104	$ 11,023	$ 10,996		$ 11,055	$ 11,066	$ 10,782		$ 11,066	$ 11,479	$ 11,618		$ 12,492	$ 12,942	$ 12,883		$ 12,947	$ 13,322	$ 12,395		$ 12,481	$ 12,593	$ 12,952		$ 12,797	$ 12,738	$ 13,440	$ 13,263	$ 11,881	$ 11,409	$ 10,200	$ 11,335	$ 11,494	$ 11,064	$ 11,229	$ 10,582	$ 11,482	$ 11,611	$ 11,159	$ 11,117	$ 11,264	$ 11,835	$ 12,311	$ 11,717	$ 10,535	$ 7,476	$ 8,753	$ 9,653	$ 10,176	$ 10,888	$ 11,641	$ 11,747	$ 11,711	$ 13,788	$ 14,494	$ 14,794	$ 15,794	$ 17,029	$ 17,452	$ 18,194	$ 18,252	$ 17,258	$ 17,670	$ 16,882	$ 17,547	$ 18,070	$ 18,681	$ 16,723	$ 16,776	$ 17,695	$ 17,209	$ 18,300	$ 15,946	$ 17,545	$ 17,336	$ 15,468	$ 17,986	$ 18,808	$ 17,761	$ 18,876	$ 18,357	$ 17,467	$ 16,607	$ 16,391	$ 18,822	$ 20,053	$ 19,937	$ 19,712	$ 18,442	$ 19,495	$ 21,239	$ 22,078	$ 24,775	$ 26,617	$ 25,334	$ 27,246	$ 25,707	$ 27,798	$ 27,953	$ 28,023	$ 27,510
Hennessy Cornerstone Growth Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	255,110		259,041	251,965	268,999		271,619	259,434	266,771		269,654	274,502	260,482		255,634	268,213	265,723		256,815	238,555	245,123		256,289	249,590	253,268		257,603	269,688	266,010		266,404	255,632	278,358		279,146	277,307	276,782		278,227	278,621	271,527		278,621	289,130	292,677		314,746	326,306	324,992		326,568	336,158	312,775		315,140	318,030	327,225		323,284	321,971	339,705	335,370	300,558	288,736	258,268	286,965	291,002	280,331	284,513	268,362	291,146	294,463	283,071	282,206	285,955	300,520	312,633	297,636	267,641	190,060	222,506	245,434	258,701	277,014	296,194	298,933	298,212	351,135	369,160	376,947	402,616	434,196	445,156	464,190	465,777	440,541	451,212	431,168	448,328	461,739	477,542	427,535	429,000	452,630	440,357	468,383	408,301	449,333	444,204	396,212	461,056	482,122	455,328	484,072	471,128	448,285	426,204	420,874	483,501	515,100	512,244	506,724	474,173	501,394	546,337	567,984	637,521	685,220	652,272	701,886	662,233	716,445	720,660	722,575	709,549
Hennessy Focus Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	10,292		10,470	10,153	10,871		11,020	10,900	10,953		10,988	11,284	10,669		10,415	11,183	11,135		10,771	10,156	10,271		10,984	11,000	11,192		10,925	11,389	11,319		11,249	11,002	11,352		11,542	11,662	12,005		12,062	12,050	12,276		12,438	12,576	12,587		13,022	13,227	13,512		13,766	14,292	13,568		13,438	13,414	13,775		13,847	14,144	14,384	14,186	12,960	13,473	12,325	13,316	13,941	14,044	14,783	14,469	15,197	15,401	15,473	15,792	16,091	16,738	16,622	16,835	15,710	11,596	13,270	14,402	15,036	15,806	16,747	15,841	14,998	16,858	17,535	17,094	18,259	19,880	20,877	20,960	21,313	21,737	22,230	21,475	22,928	22,205	23,067	21,151	20,656	20,934	19,020	19,581	17,912	19,925	18,453	16,105	17,070	18,476	17,303	19,195	18,517	18,065	18,379	17,812	19,803	20,102	20,083	18,612	17,670	19,298	20,910	20,374	21,509	21,837	19,867	21,219	21,306	24,262	24,948	25,320	24,373
Hennessy Focus Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	257,376		261,880	253,988	272,031		275,862	272,951	274,330		275,249	282,834	267,473		261,228	280,574	279,425		270,382	255,028	257,984		275,987	276,486	281,169		274,758	286,504	284,815		283,165	277,023	285,928		290,803	293,951	302,664		304,199	304,007	309,804		313,987	317,596	317,941		329,034	334,331	341,663		348,133	361,568	343,334		340,187	339,649	348,939		350,858	358,536	364,716	359,764	328,824	341,914	312,904	338,139	354,186	356,845	375,736	367,853	386,465	391,783	393,742	401,952	409,695	426,301	423,474	428,998	400,450	295,652	338,397	367,359	383,723	403,496	427,656	404,683	383,259	430,960	448,383	437,206	467,150	508,832	534,488	536,808	545,946	557,051	569,844	550,655	588,050	569,633	591,953	543,015	530,492	537,825	488,804	503,387	460,628	512,532	474,799	414,491	439,454	475,787	445,709	494,655	477,269	465,835	473,961	459,504	511,001	518,939	518,561	480,765	456,575	498,812	540,690	526,865	556,420	565,120	514,352	549,508	551,892	628,759	646,754	656,526	632,096
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	10,411		10,442	10,191	10,833		10,995	10,967	11,425		11,610	11,961	11,431		11,012	11,235	10,939		10,444	9,892	10,202		10,839	10,349	10,489		10,371	10,867	10,658		10,794	10,349	11,115		11,053	11,194	11,608		11,495	11,608	11,478		11,704	11,835	11,778		12,368	12,730	13,082		13,319	13,353	12,266		12,395	12,719	13,279		13,070	13,130	13,124	12,590	11,389	11,362	10,285	11,400	11,765	11,522	11,728	10,641	11,456	11,428	10,876	11,213	11,250	11,775	11,906	11,887	10,623	7,466	8,936	9,995	10,257	11,353	12,159	12,524	12,430	13,995	14,688	16,028	17,339	18,351	18,585	19,053	18,875	18,688	18,679	17,451	18,529	18,070	18,686	17,790	18,657	19,343	18,838	19,439	16,828	18,638	19,077	17,323	19,849	20,601	19,207	20,720	21,170	20,962	20,189	20,316	22,740	24,367	23,271	23,063	21,839	23,698	25,120	24,942	27,842	29,534	28,300	31,187	30,691	32,841	32,701	33,184	33,680
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	260,331		261,280	254,977	271,144		275,118	274,570	286,079		290,737	299,643	286,353		275,940	281,557	274,296		261,873	248,024	255,918		271,982	259,795	263,396		260,488	273,090	267,966		271,428	260,349	279,737		278,113	281,875	292,325		289,538	292,464	289,399		295,112	298,456	297,062		312,111	321,446	330,363		336,416	337,413	310,015		313,502	321,638	335,918		330,605	332,431	332,265	318,981	288,594	287,930	260,913	289,163	298,350	292,378	297,661	270,100	291,000	290,311	276,531	284,799	286,177	299,498	302,714	302,484	270,329	190,172	227,609	254,711	261,372	289,392	309,834	319,480	317,183	357,147	374,832	409,284	442,816	468,999	475,201	487,144	482,780	478,186	477,957	446,721	474,512	463,028	478,871	455,978	478,170	496,157	483,309	498,960	431,918	478,404	490,083	444,999	510,173	529,561	494,071	533,122	544,724	539,630	519,822	523,218	585,755	627,918	599,903	594,527	563,400	611,505	648,559	643,882	719,340	762,993	731,188	806,022	793,550	849,363	846,245	858,718	872,125
Hennessy Cornerstone Large Growth Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	10,323		10,407	10,181	10,757		10,648	10,640	10,648		10,368	10,368	9,761		9,395	10,111	10,080		9,720	9,397	9,690		10,306	9,942	9,690		9,518	10,134	10,276		10,387	10,377	11,205		11,148	11,209	11,567		11,556	11,597	11,740		11,843	11,873	11,638		12,057	12,006	12,742		13,052	13,765	13,296		12,977	12,711	12,892		12,945	13,392	13,754	13,701	13,030	13,339	11,879	12,879	13,173	13,199	13,719	12,306	13,399	13,813	13,253	13,746	14,053	14,732	15,149	14,562	13,100	10,778	12,226	12,895	13,196	13,934	14,767	14,494	13,947	15,559	15,981	16,096	17,290	19,088	19,620	19,793	19,936	20,310	20,670	19,577	20,641	20,282	21,519	20,447	20,217	20,728	19,359	19,326	16,754	18,370	17,793	16,061	18,007	19,557	18,655	20,379	19,713	19,458	19,223	18,773	20,811	22,124	21,516	20,713	19,713	21,183	22,705	22,339	23,500	25,169	23,846	24,111	23,581	24,559	24,599	25,027	24,314
Hennessy Cornerstone Large Growth Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	258,007		260,129	254,721	269,012		266,308	266,115	266,308		259,356	259,356	244,293		235,023	252,983	252,211		243,300	235,265	242,547		258,114	249,075	243,049		238,530	254,097	257,612		260,374	260,374	280,963		279,907	281,433	290,594		290,085	291,357	295,174		297,719	298,482	292,630		303,062	302,045	320,620		328,421	346,210	334,528		326,829	319,926	324,970		326,032	337,448	346,741	345,413	328,687	336,386	299,994	325,021	332,696	333,364	346,712	311,006	338,703	349,047	335,032	347,713	355,388	372,740	383,440	368,363	331,698	273,102	309,767	326,901	334,439	353,286	374,531	367,677	353,971	394,748	405,551	408,807	438,834	484,780	498,527	503,230	506,848	516,254	525,661	497,804	524,937	515,893	547,750	520,736	514,503	527,802	493,307	492,476	426,813	468,372	453,826	409,773	459,229	499,126	476,222	520,326	503,478	497,035	491,089	479,691	531,724	565,421	550,555	529,742	504,469	542,130	581,295	572,002	601,945	644,277	610,721	617,948	604,526	629,306	630,338	641,696	623,627
Hennessy Cornerstone Value Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	10,255		10,112	9,790	10,195		9,956	10,367	10,178		9,945	9,795	9,307		8,990	9,823	9,768		9,468	9,092	9,240		9,992	10,117	10,054		10,088	10,493	10,527		10,538	10,453	10,937		11,102	11,323	11,579		11,556	11,492	11,567		11,777	12,033	11,864		12,411	12,505	12,825		13,229	13,820	12,940		12,846	13,061	13,202		13,188	13,638	13,665	13,732	12,960	13,128	11,993	12,854	13,088	13,190	13,566	12,478	13,268	13,307	12,963	13,472	13,636	14,066	14,487	13,719	12,409	10,373	11,332	11,549	11,649	11,833	12,317	11,700	11,424	13,268	13,562	13,605	14,453	15,574	15,874	16,508	16,456	16,242	16,430	16,148	16,773	16,388	17,618	18,283	18,184	18,651	18,094	19,190	17,466	17,861	17,466	16,083	18,229	19,351	18,698	19,232	18,618	18,539	18,985	17,816	18,886	19,559	19,015	18,708	17,965	18,945	19,785	19,836	19,928	20,954	20,513	21,159	20,851	21,682	22,359	22,308	22,164
Hennessy Cornerstone Value Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	256,382		252,943	244,878	255,168		249,050	259,340	254,612		248,772	245,017	232,780		224,854	245,712	244,461		236,853	227,590	231,295		250,249	253,384	251,959		252,956	263,075	264,072		264,357	262,220	274,476		278,566	284,266	290,697		290,259	288,651	290,697		296,105	302,535	298,297		312,182	314,520	322,558		332,823	347,697	325,723		323,357	328,766	332,485		332,316	343,641	344,317	346,176	326,738	330,963	302,468	324,172	330,091	332,853	342,521	314,898	334,826	336,010	327,526	340,153	344,297	355,148	365,926	346,533	313,651	262,219	286,459	291,940	294,680	299,317	311,543	295,945	288,989	335,783	343,246	344,329	365,999	394,603	402,187	418,223	416,923	411,505	416,706	409,338	425,374	415,622	446,917	464,001	461,495	473,568	459,445	487,235	443,728	453,750	443,956	408,649	463,317	492,019	475,365	488,961	473,351	471,588	482,919	453,208	480,653	497,774	484,177	476,372	457,489	482,415	503,882	505,448	507,796	534,152	522,931	539,370	531,803	552,939	570,423	569,379	565,726
Hennessy Total Return Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	10,216		10,027	9,815	10,238		10,010	10,222	10,201		9,970	10,034	9,572		9,452	10,122	10,101		10,126	9,993	10,072		10,597	10,683	10,778		11,030	11,172	11,125		11,198	10,953	11,269		11,434	11,393	11,708		11,584	11,626	11,601		11,643	11,928	11,962		12,261	12,320	12,556		12,711	12,936	12,383		12,316	12,486	12,486		12,592	12,849	13,029	13,211	12,935	13,411	12,725	13,119	13,513	13,741	13,800	13,345	13,895	13,965	13,676	13,921	13,961	14,041	14,323	13,712	12,740	11,763	12,754	12,986	12,696	12,818	12,930	12,593	12,235	13,400	13,632	13,632	13,969	14,881	14,859	15,154	15,071	14,928	15,049	14,606	14,892	14,441	15,241	15,362	15,175	15,553	15,364	16,018	14,966	15,122	14,577	13,717	15,059	15,864	15,454	15,642	15,206	15,477	15,453	14,906	15,360	15,887	15,791	15,344	15,138	15,887	16,693	16,718	16,604	17,097	16,649	16,982	16,715	17,541	17,735	17,916	17,487
Hennessy Equity and Income Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	10,240		10,288	10,176	10,475		10,328	10,328	10,415		10,242	10,267	9,872		9,716	10,143	10,174		10,019	9,709	9,696		10,078	10,175	10,227		10,268	10,489	10,437		10,299	10,131	10,449		10,592	10,734	11,010		10,943	11,028	11,141		11,154	11,246	11,275		11,486	11,565	11,821		12,023	12,346	12,023		11,853	11,710	11,861		11,863	12,187	12,421	12,492	11,963	12,076	11,503	11,928	12,198	12,389	12,709	12,233	12,638	12,762	12,663	12,827	12,967	13,198	13,342	13,386	12,583	11,368	12,227	12,670	12,803	13,327	13,931	13,674	13,452	14,270	14,538	14,397	14,623	15,369	15,822	15,907	15,962	16,142	16,312	15,723	16,309	16,224	16,968	16,383	15,747	15,952	14,972	15,053	14,250	15,070	14,574	13,656	14,254	15,035	14,618	15,108	14,763	14,942	15,214	14,963	15,667	15,960	15,772	15,155	14,777	15,668	16,142	16,119	16,553	16,984	16,355	16,641	16,731	17,315	17,761	17,831	17,796
Hennessy Equity and Income Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	256,013		257,273	254,469	262,056		258,542	258,542	260,858		256,523	257,352	247,397		243,729	254,384	255,216		251,488	243,784	243,442		253,348	255,581	257,127		258,181	263,869	262,662		259,294	255,145	263,270		267,050	270,639	277,627		275,935	278,210	281,242		281,675	283,955	284,906		290,305	292,402	298,883		304,113	312,365	304,314		300,101	296,666	300,506		300,690	309,003	315,086	316,907	303,686	306,737	292,005	303,024	310,077	315,131	323,325	311,145	321,514	324,849	322,625	326,710	330,280	336,306	340,180	341,135	320,830	290,187	312,047	323,577	327,005	340,269	355,944	349,591	344,027	365,075	371,983	368,653	374,289	393,490	405,312	407,625	409,275	413,911	418,547	403,397	418,624	416,302	435,704	421,079	404,799	410,003	385,121	387,056	366,583	387,657	375,179	351,502	367,352	387,097	376,473	389,642	380,767	385,194	392,370	386,055	404,355	412,131	407,523	391,832	382,014	405,114	417,503	417,188	428,523	439,558	423,465	431,038	433,637	448,830	460,542	462,296	461,661
Hennessy Balanced Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	10,162		10,017	9,863	10,154		9,973	10,110	10,102		9,925	9,965	9,641		9,534	10,011	9,987		9,991	9,891	9,908		10,275	10,341	10,366		10,557	10,689	10,656		10,706	10,532	10,789		10,905	10,887	11,119		11,022	11,066	11,048		11,085	11,317	11,317		11,520	11,538	11,690		11,815	12,056	11,729		11,638	11,725	11,735		11,785	11,920	12,017	12,112	11,937	12,257	11,827	12,122	12,395	12,533	12,573	12,258	12,651	12,692	12,467	12,618	12,659	12,823	12,973	12,578	12,002	11,392	11,895	11,981	11,818	11,904	12,043	11,839	11,667	12,420	12,587	12,554	12,878	13,413	13,435	13,640	13,534	13,437	13,523	13,221	13,372	13,059	13,592	13,626	13,514	13,719	13,562	13,909	13,237	13,372	13,058	12,515	13,279	13,762	13,429	13,558	13,266	13,465	13,406	13,077	13,324	13,643	13,643	13,380	13,249	13,654	14,133	14,169	14,073	14,388	14,134	14,340	14,217	14,728	14,874	15,014	14,769
Hennessy Energy Transition Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	9,368		9,001	8,870	9,434		9,462	10,394	9,745		9,312	8,328	7,872		6,931	7,665	7,721		6,780	6,418	6,225		7,166	8,117	8,065		8,173	8,343	8,724		9,133	8,583	9,665		9,693	9,815	9,585		9,505	9,095	8,663		8,587	8,686	8,211		9,015	8,940	9,161		9,877	10,008	9,039		9,152	10,036	10,319		10,098	10,375	10,135	10,084	8,620	8,145	6,799	7,806	7,877	7,961	8,131	6,926	7,609	7,420	6,583	6,813	6,625	6,578	7,190	6,348	5,402	2,884	4,192	4,371	4,320	4,451	4,578	3,915	4,112	5,054	5,341	5,741	6,809	6,945	7,011	7,514	7,886	7,147	7,006	7,980	8,615	8,065	8,300	9,344	10,180	11,228	11,095	12,703	10,318	11,319	11,559	10,414	12,858	13,001	12,245	12,721	12,020	11,603	11,742	10,789	11,844	13,064	13,149	13,144	12,962	12,786	12,700	12,341	12,796	14,215	14,284	14,643	14,113	14,514	14,252	13,968	13,851
Hennessy Energy Transition Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	234,089		224,930	221,755	235,865		236,688	259,969	243,860		233,043	208,469	197,064		173,548	192,008	193,536		170,020	160,967	156,146		179,779	203,648	202,472		205,294	209,527	219,169		229,516	215,641	243,104		243,693	246,873	241,220		239,217	228,970	218,016		216,250	218,723	206,827		227,086	225,319	230,973		248,993	252,291	228,028		230,855	253,234	260,418		254,882	262,067	255,943	254,647	217,899	205,767	171,963	197,404	199,289	201,409	205,767	175,379	192,693	187,982	166,899	172,670	167,959	166,781	182,370	161,005	137,043	73,184	106,353	110,838	109,658	112,963	116,150	99,388	104,464	128,426	135,626	145,896	173,045	176,586	178,238	191,222	200,784	182,015	178,474	203,380	219,552	205,505	211,602	238,202	259,723	286,458	283,116	324,287	263,600	288,997	295,280	266,273	328,698	332,440	313,192	325,451	307,669	297,162	300,665	276,417	303,493	334,880	337,170	337,170	332,455	328,145	325,989	316,829	328,684	365,189	367,075	376,370	362,899	373,271	366,671	359,531	356,433
Hennessy Midstream Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000																7,665																7,994																7,798															7,238												6,784												3,926												7,004												8,687												10,110												12,618
Hennessy Midstream Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000																192,167																200,963																196,466															182,934												171,768												99,740												178,106												221,591												258,528												323,938
Hennessy Gas Utility Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	9,901		10,098	10,059	9,880		9,913	10,023	9,983		9,489	9,616	9,211		8,889	9,341	8,879		8,482	8,684	8,869		9,518	9,613	9,711		10,426	10,429	10,065		10,340	10,137	9,981		10,238	10,476	10,751		10,806	10,824	11,046		10,856	11,128	11,275		11,080	11,190	11,389		10,958	10,619	10,013		10,235	10,538	10,662		10,972	11,100	11,149	11,048	10,870	11,215	10,573	11,350	11,679	12,061	12,103	11,944	12,386	12,142	12,281	12,704	12,531	12,201	12,771	13,105	11,757	10,332	10,957	11,133	10,729	11,181	11,027	10,779	10,966	11,649	11,581	11,472	11,244	12,463	13,041	13,121	12,825	12,981	13,116	12,610	13,149	12,791	13,841	14,138	14,314	15,675	15,332	16,024	14,661	15,706	15,484	13,789	14,482	15,332	14,693	14,938	14,262	14,564	14,919	14,059	14,575	14,926	14,309	13,732	13,756	14,500	14,732	14,311	14,502	15,176	15,163	15,740	15,529	16,505	17,191	17,702	17,929
Hennessy Gas Utility Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	247,524		252,459	251,466	246,997		247,821	250,569	249,570		237,221	240,406	230,263		222,226	233,527	221,973		212,047	217,107	221,730		237,954	240,325	242,783		260,638	260,726	251,632		258,490	253,433	249,530		255,947	261,910	268,776		270,264	270,719	276,357		271,721	278,615	282,383		277,513	280,380	285,466		274,723	266,319	251,191		256,848	264,565	267,671		275,558	278,875	280,202	277,827	273,343	282,120	266,056	285,667	294,057	303,765	304,928	301,017	312,169	306,100	309,720	320,460	316,076	307,949	322,413	330,886	296,995	260,964	276,804	281,362	271,329	282,678	278,895	272,727	277,465	294,915	293,255	290,612	284,822	315,914	330,607	332,634	325,239	329,320	332,892	320,023	333,753	324,771	351,629	359,340	363,827	398,509	389,763	407,678	372,961	399,783	394,106	351,052	368,898	390,598	374,405	380,826	363,704	371,370	380,596	358,760	371,893	381,032	365,233	350,617	351,398	370,443	376,490	365,850	370,924	388,122	387,793	402,771	397,479	422,539	440,131	453,413	459,427
Hennessy Japan Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	9,729		9,646	10,005	10,519		10,721	10,813	10,831		11,052	11,346	10,744		9,867	11,056	11,116		10,896	10,464	10,570		10,974	11,208	11,709		11,851	12,081	12,145		12,687	12,774	12,186		12,122	12,811	12,761		12,802	13,050	13,730		13,817	14,038	14,166		14,355	15,044	15,765		16,006	16,581	16,213		16,227	16,195	16,420		16,365	16,153	16,585	17,366	15,446	16,016	14,955	15,447	15,700	16,044	16,545	15,778	16,343	16,081	15,792	16,394	17,083	17,322	17,653	16,976	15,716	14,795	15,720	17,506	17,860	18,412	19,346	19,673	19,692	21,611	22,158	21,753	21,629	21,086	20,718	20,856	20,718	20,943	21,928	22,559	21,988	21,592	21,478	19,096	18,149	17,517	15,270	15,642	14,384	15,549	14,931	13,422	13,664	15,400	14,894	15,814	15,168	15,957	15,995	16,496	17,336	17,555	17,248	16,649	16,241	17,401	18,297	18,746	20,298	21,126	20,042	20,875	21,353	22,053	22,718	22,787	21,294
Hennessy Japan Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	243,228		241,196	250,226	263,093		268,172	270,542	270,993		276,637	284,086	269,074		247,178	277,088	278,668		273,138	262,415	265,011		275,282	281,264	293,905		297,630	303,386	305,192		318,849	321,106	306,546		304,966	322,460	321,219		322,348	328,781	346,050		348,307	353,950	357,336		362,190	379,684	398,081		404,387	418,958	409,809		410,260	409,696	415,456		414,214	409,131	420,201	440,081	391,622	406,194	379,373	391,951	398,523	407,475	420,392	400,903	415,407	408,948	401,696	417,106	434,783	441,015	449,601	432,523	400,531	377,191	400,872	446,527	455,749	470,094	494,003	502,656	503,111	552,409	566,679	556,431	553,471	539,808	530,358	534,115	530,699	536,734	562,124	578,634	564,060	554,154	551,379	490,449	466,285	450,214	392,637	402,233	369,976	400,152	384,312	345,580	351,824	396,683	383,734	407,667	391,018	411,482	412,639	425,703	447,439	453,336	445,590	430,212	419,922	449,983	473,318	485,099	525,473	547,071	519,092	540,935	553,575	571,860	589,286	591,249	552,593
Hennessy Japan Small Cap Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	9,696		9,862	10,039	10,195		10,362	10,654	11,050		11,404	11,175	10,716		10,477	10,727	10,956		11,004	10,595	10,239		11,069	11,026	11,338		11,457	11,845	11,522		12,211	12,168	11,910		11,941	12,601	13,349		13,712	13,778	14,382		14,778	15,240	15,504		15,999	16,406	17,263		17,862	18,659	18,367		18,401	18,412	18,626		18,143	18,154	18,019	18,401	16,839	17,311	15,627	16,276	16,798	16,427	16,821	16,508	17,019	17,169	16,589	17,100	17,900	18,086	18,744	17,781	15,571	14,396	15,513	17,358	17,181	16,923	17,640	18,545	18,486	20,378	21,262	20,708	20,414	21,368	20,849	20,755	20,861	21,321	21,179	21,627	21,344	19,966	20,273	18,972	19,114	17,801	16,441	16,926	16,051	16,997	16,678	15,637	15,507	17,068	16,960	18,055	17,519	18,340	18,186	17,650	18,174	18,483	18,328	18,007	17,543	18,638	19,722	19,422	19,854	20,490	19,830	19,938	20,034	21,439	21,078	21,475	19,962
Hennessy Japan Small Cap Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	242,395		246,538	250,968	254,877		259,047	266,344	276,248		285,108	279,636	268,169		262,435	268,429	274,423		275,652	265,143	256,520		277,268	276,190	284,005		286,969	296,938	289,124		306,369	305,291	298,825		299,405	316,226	335,009		344,540	345,942	361,361		371,453	382,947	389,956		402,291	412,663	434,530		449,909	470,281	462,821		463,682	464,543	469,995		457,656	458,230	455,074	464,830	425,520	437,571	395,321	411,966	425,342	416,127	426,233	418,208	431,583	435,150	420,883	433,664	454,173	458,929	476,051	451,568	395,651	366,030	394,442	441,594	437,362	430,713	449,150	472,122	470,913	519,273	542,139	528,145	520,843	545,486	532,100	529,970	533,012	544,877	541,227	553,092	545,790	510,803	518,815	485,660	489,650	455,881	421,191	433,778	411,675	435,927	427,945	401,544	398,167	438,383	435,849	464,118	450,449	471,885	467,846	454,488	467,846	476,234	472,195	463,808	452,313	480,894	508,813	501,266	512,587	528,940	512,273	515,103	517,933	554,412	545,292	555,670	516,675
Hennessy Large Cap Financial Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	10,216		10,428	9,621	10,104		10,019	10,067	10,295		10,301	10,455	9,786		9,330	9,743	10,088		9,791	8,762	8,393		8,762	9,136	9,136		8,580	8,926	9,335		9,206	9,493	10,809		11,256	11,256	11,820		11,338	11,279	11,250		11,755	12,091	11,973		12,443	12,949	13,308		13,437	14,544	14,304		13,744	13,658	13,830		13,615	14,033	14,464	14,132	13,184	13,301	11,861	12,976	13,546	13,217	14,389	13,540	14,459	15,022	14,300	14,066	14,338	15,155	15,390	15,694	14,465	11,449	12,938	13,724	13,926	14,440	15,371	15,060	14,148	16,746	17,937	17,329	19,014	19,324	20,775	20,959	20,946	21,232	22,100	21,213	22,378	21,111	21,310	20,584	19,779	18,900	16,889	17,482	15,285	16,610	16,303	14,859	16,510	17,295	16,008	17,594	17,008	13,599	13,957	13,363	14,035	15,900	14,700	14,085	13,271	15,014	16,740	16,529	16,892	18,186	17,430	17,837	17,656	19,015	19,160	18,913	19,894
Hennessy Large Cap Financial Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	255,391		260,701	240,535	252,608		250,485	251,679	257,384		257,517	261,497	244,913		233,503	243,984	252,741		245,359	219,663	210,559		219,957	229,354	229,354		215,698	224,362	234,640		231,556	238,751	271,936		283,473	283,473	297,796		285,711	284,368	283,771		296,602	305,256	302,272		314,357	326,889	336,139		339,404	367,506	361,573		347,522	345,337	349,864		344,400	355,172	366,101	357,982	334,096	337,218	300,712	329,175	343,648	335,447	365,197	343,809	367,287	381,760	363,428	357,639	364,714	385,458	391,569	399,449	368,252	291,546	329,497	349,598	354,905	367,930	391,891	384,011	360,855	427,269	457,822	442,385	485,642	493,843	530,990	535,975	535,815	543,212	565,564	543,051	572,961	540,639	545,919	527,502	507,057	484,754	433,220	448,427	392,162	426,462	418,690	381,687	424,265	444,541	411,541	452,185	437,239	349,755	359,050	343,923	361,237	409,354	378,734	362,878	341,918	387,118	431,560	426,358	435,833	469,459	449,952	460,541	455,897	491,195	495,096	488,779	514,417
Hennessy Small Cap Financial Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	9,896		10,200	9,532	10,210		10,450	10,426	10,609		11,109	11,191	10,854		11,013	11,451	12,100		11,398	10,711	10,407		10,949	11,377	11,681		11,098	11,501	12,089		12,125	12,115	14,086		15,206	14,705	14,863		14,443	14,327	13,855		14,455	14,507	13,949		15,095	15,148	15,666		15,175	15,591	15,238		15,232	15,333	16,025		15,830	15,710	15,874	15,169	13,816	14,257	12,768	13,771	14,754	13,535	14,417	13,508	14,330	14,511	13,387	13,939	14,545	14,848	15,306	14,373	13,174	9,482	10,590	10,325	10,666	10,325	10,659	9,984	12,164	14,317	15,701	16,270	19,090	20,461	21,340	22,050	20,602	19,835	21,080	21,473	22,163	21,860	22,413	22,498	22,740	21,370	19,453	20,219	18,579	20,305	19,943	19,076	20,922	21,391	19,911	20,685	20,785	16,749	15,774	14,692	15,836	18,914	17,468	16,625	15,790	17,568	20,823	19,858	18,658	19,282	17,879	18,504	18,869	22,380	22,469	22,185	22,607
Hennessy Small Cap Financial Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	247,591		255,130	238,560	255,529		261,718	261,119	265,910		278,487	280,483	272,099		276,291	287,470	303,641		286,257	269,103	261,384		275,107	286,043	293,762		279,181	289,474	304,269		305,341	305,127	354,873		383,356	370,903	375,054		364,311	361,625	349,904		365,043	366,508	352,590		381,647	383,112	396,298		383,872	394,703	385,985		385,985	388,627	406,328		401,308	398,402	402,629	385,193	350,848	362,208	324,527	350,042	374,983	344,308	366,956	343,734	364,662	369,536	340,868	355,202	370,396	378,423	390,099	366,412	336,127	241,976	270,161	263,564	272,260	263,564	272,260	254,869	310,940	366,112	401,446	416,144	488,717	523,932	546,591	564,964	527,912	508,621	540,467	550,878	568,639	561,290	575,573	577,762	584,327	549,311	499,914	519,923	478,029	522,424	513,357	491,160	538,994	551,187	513,160	533,175	535,936	432,062	406,870	379,262	408,940	488,313	451,042	429,646	407,905	454,148	538,338	513,633	482,660	498,884	462,749	478,973	488,560	579,635	582,216	574,842	585,903
Hennessy Technology Fund - Investor Class
Account Value [Line Items]
Accumulated Value		10,000	10,155		9,913	9,731	10,336		10,175	10,283	10,525		10,276	10,518	9,697		9,361	10,336	10,417		10,256	9,280	9,206		9,758	9,798	10,114		9,899	10,518	10,707		10,962	10,646	10,485		10,464	10,962	11,319		11,218	11,265	11,642		11,649	12,059	11,891		12,147	12,423	12,544		12,578	13,420	13,516		13,412	13,420	14,003		13,626	13,929	15,229	14,867	13,324	13,457	12,348	14,021	15,006	14,947	15,941	14,038	15,227	15,737	15,219	15,567	16,051	16,892	17,177	17,072	15,519	13,347	15,223	16,086	16,819	17,351	18,468	18,145	17,883	21,207	22,842	22,833	24,107	24,879	25,390	25,313	26,336	26,268	26,693	25,168	25,950	25,187	25,895	23,846	23,060	23,111	20,624	20,701	18,484	20,469	19,683	17,543	19,090	20,482	19,091	21,116	20,974	22,032	20,445	22,393	24,005	24,470	23,851	22,754	21,851	24,238	25,953	26,082	27,346	27,772	26,301	27,488	28,894	29,449	29,436	29,449	28,739
Hennessy Technology Fund - Institutional Class
Account Value [Line Items]
Accumulated Value		250,000	253,828		247,836	243,509	258,655		254,660	257,490	263,648		257,490	263,648	243,176		234,687	259,321	261,485		257,490	233,189	231,358		245,173	246,338	254,328		248,835	264,647	269,308		275,965	268,142	264,148		263,648	276,298	285,453		282,956	284,121	293,775		293,941	304,427	300,100		306,758	313,748	316,744		317,866	339,240	341,614		339,057	339,240	354,037		344,720	352,393	385,458	376,324	337,413	340,884	312,772	355,203	380,200	378,940	403,936	355,834	386,292	399,315	386,081	394,904	407,507	428,723	436,269	433,678	394,175	339,128	386,835	409,070	427,418	441,234	469,513	461,525	455,049	539,670	581,379	581,379	613,944	633,578	646,748	644,832	671,172	669,735	680,510	641,959	662,073	642,677	660,799	608,665	588,834	590,114	526,784	529,023	472,411	523,266	503,116	448,422	488,083	523,906	488,517	540,261	536,725	564,044	523,548	573,364	614,824	626,715	610,967	583,006	560,187	621,252	665,604	669,139	701,600	712,527	675,246	705,778	742,095	756,558	756,236	756,879	738,560
Hennessy Stance ESG ETF
Account Value [Line Items]
Accumulated Value	$ 10,000			$ 10,043				$ 10,802				$ 11,116				$ 10,899				$ 10,304				$ 10,351				$ 10,294				$ 10,684				$ 10,796				$ 10,942				$ 9,677				$ 11,374				$ 11,691				$ 12,136				$ 12,405
Russell/Nomura Total Market Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	248,754		245,017	250,385	266,438		270,096	282,054	285,013		281,389	281,821	267,589		249,924	274,485	273,609		273,737	253,039	245,278		258,340	266,727	267,797		262,219	275,816	278,224		285,579	289,266	283,714		282,788	292,453	298,339		298,178	303,310	311,882		317,620	323,082	323,393		331,379	347,651	355,573		359,612	376,997	368,648		363,981	365,474	361,722		352,627	354,819	353,383	364,041	330,699	334,130	307,741	328,628	330,960	331,080	334,639	321,125	333,476	334,083	328,855	344,094	358,929	362,910	369,505	361,933	325,700	306,590	326,156	346,714	345,145	342,567	364,608	369,419	363,886	406,572	421,384	418,518	425,301	429,805	425,739	427,315	429,178	422,995	435,474	446,018	433,616	420,294	427,062	403,507	401,469	398,203	361,609	373,209	342,046	364,112	353,188	320,290	328,382	361,298	361,177	383,275	368,154	384,531	387,252	390,705	405,040	418,784	409,267	402,828	386,750	416,965	433,363	446,956	462,546	477,435	456,135	461,130	457,814	485,984	491,582	493,067	469,986
Tokyo Stock Price Index (TOPIX) [Member]
Account Value [Line Items]
Accumulated Value		250,000	249,846		248,154	253,538	268,308		273,077	282,462	286,154		283,231	284,769	269,692		252,308	276,615	274,615		275,385	253,846	246,769		259,846	267,692	269,692		263,538	280,154	279,077		286,154	290,308	282,462		285,538	296,462	301,077		300,615	304,308	314,000		318,154	324,923	326,154		332,615	347,538	358,154		361,385	376,923	371,231		364,923	367,231	363,692		354,000	354,923	354,615	365,385	333,231	335,385	309,692	329,692	330,769	332,923	335,846	322,462	334,000	334,462	330,615	344,308	361,385	363,692	370,615	364,769	328,923	308,923	325,385	345,012	343,877	336,763	363,211	369,729	362,645	404,068	420,200	415,346	420,872	428,942	421,675	426,789	425,652	421,085	433,991	445,934	430,172	416,406	424,749	403,985	402,408	398,265	360,109	369,620	342,825	361,457	352,692	319,223	326,711	358,277	361,602	383,120	369,226	384,325	385,782	389,577	405,012	418,162	409,860	401,898	384,160	414,875	434,063	451,342	462,515	477,686	455,215	461,128	457,020	485,968	487,626	488,769	467,606
Russell 2000® Index
Account Value [Line Items]
Accumulated Value		10,000	10,009		10,294	9,963	10,555		10,738	10,465	10,703		10,784	10,658	9,989		9,498	10,034	10,360		9,840	8,975	8,974		9,690	9,842	10,064		10,058	10,658	10,847		10,968	10,446	11,611		11,936	11,984	12,215		12,231	12,365	12,113		12,532	12,625	12,465		13,243	13,355	13,740		13,685	14,042	13,499		13,673	13,792	14,629		14,734	14,990	15,637	15,260	13,603	13,819	12,178	13,548	14,252	13,954	14,428	13,306	14,246	14,328	13,621	13,904	14,270	14,858	15,286	14,796	13,550	10,606	12,063	12,848	13,302	13,670	14,441	13,958	14,251	16,877	18,337	19,260	20,460	20,666	21,100	21,143	21,553	20,775	21,239	20,613	21,490	20,594	21,055	19,028	19,231	19,470	17,540	17,567	16,122	17,805	17,441	15,769	17,506	17,914	16,752	18,384	18,074	17,210	16,901	16,745	18,106	19,213	18,252	17,178	16,006	17,455	19,588	18,826	19,890	20,602	19,152	20,113	19,927	21,952	21,624	21,775	21,460
S&P 500® Index
Account Value [Line Items]
Accumulated Value	$ 10,000	10,000	10,269	$ 10,549	10,243	9,936	10,507	$ 11,129	10,340	10,440	10,574	$ 11,700	10,369	10,586	9,948	$ 11,512	9,702	10,520	10,551	$ 10,572	10,385	9,869	9,856	$ 10,613	10,525	10,566	10,755	$ 9,991	10,783	11,181	11,196	$ 10,566	11,199	10,994	11,401	$ 10,853	11,627	11,847	12,318	$ 11,994	12,332	12,459	12,634	$ 11,004	12,713	12,974	13,014	$ 12,766	13,283	13,593	14,009	$ 13,313	14,165	14,976	14,424	$ 14,651	14,058	14,112	14,451	$ 15,188	14,540	15,081	15,573	15,662	14,591	14,888	13,544	14,629	15,099	15,393	16,016	14,998	16,055	16,286	16,028	16,328	16,681	17,287	17,809	17,802	16,336	14,319	16,154	16,923	17,260	18,233	19,544	18,801	18,301	20,305	21,085	20,872	21,448	22,387	23,582	23,747	24,301	24,878	25,635	24,443	26,155	25,974	27,138	25,734	24,963	25,890	23,632	23,676	21,721	23,724	22,757	20,661	22,334	23,582	22,223	23,619	23,043	23,889	24,262	24,367	25,977	26,812	26,385	25,127	24,599	26,845	28,065	28,536	30,060	31,027	29,760	31,236	32,356	32,750	33,545	34,261	33,950
Russell 2000® Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	250,224		257,355	249,077	263,864		268,461	261,614	267,587		269,591	266,458	249,713		237,462	250,840	259,000		245,996	224,364	224,354		242,260	246,062	251,605		251,446	266,459	271,171		274,192	261,157	290,279		298,412	299,589	305,371		305,771	309,124	302,835		313,304	315,631	311,616		331,063	333,885	343,508		342,121	351,062	337,469		341,833	344,789	365,718		368,338	374,758	390,914	381,511	340,073	345,478	304,440	338,689	356,297	348,840	360,690	332,639	356,149	358,199	340,513	347,598	356,753	371,438	382,148	369,892	338,754	265,155	301,575	321,200	332,553	341,758	361,014	348,955	356,263	421,931	458,428	481,498	511,507	516,644	527,493	528,581	538,822	519,366	530,983	515,327	537,249	514,862	526,363	475,688	480,766	486,750	438,508	439,171	403,052	445,132	436,023	394,237	437,638	447,860	418,793	459,611	451,848	430,259	422,523	418,620	452,655	480,336	456,306	429,442	400,155	436,372	489,690	470,644	497,255	515,056	478,805	502,826	498,174	548,789	540,591	544,369	536,506
S&P 500® Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	256,724		256,077	248,390	262,665		258,511	260,991	264,347		259,230	264,661	248,693		242,540	262,999	263,781		259,621	246,737	246,404		263,120	264,140	268,883		269,580	279,519	279,912		279,965	274,858	285,037		290,671	296,184	307,944		308,304	311,470	315,853		317,824	324,360	325,353		332,064	339,813	350,235		354,129	374,404	360,605		351,441	352,789	361,285		363,509	377,036	389,322	391,538	364,776	372,210	338,603	365,737	377,480	384,815	400,396	374,952	401,377	407,146	400,696	408,194	417,035	432,173	445,217	445,042	408,407	357,963	403,852	423,087	431,501	455,831	488,596	470,031	457,531	507,614	527,131	521,809	536,198	559,681	589,551	593,669	607,528	621,959	640,871	611,064	653,876	649,345	678,446	643,339	624,076	647,248	590,807	591,891	543,034	593,104	568,916	516,520	558,338	589,540	555,574	590,483	576,076	597,226	606,548	609,184	649,436	670,299	659,627	628,177	614,969	671,131	701,621	713,411	751,504	775,684	744,001	780,892	808,912	818,759	838,619	856,530	848,762
Russell 3000® Index
Account Value [Line Items]
Accumulated Value		10,000	10,242		10,242	9,957	10,534		10,427	10,474	10,619		10,441	10,616	9,975		9,684	10,449	10,507		10,291	9,711	9,707		10,391	10,455	10,642		10,664	11,087	11,116		11,133	10,892	11,380		11,602	11,820	12,260		12,268	12,398	12,525		12,638	12,876	12,901		13,216	13,504	13,914		14,053	14,794	14,249		13,963	14,016	14,412		14,506	14,987	15,514	15,539	14,395	14,683	13,317	14,460	14,968	15,187	15,793	14,771	15,809	16,044	15,717	15,993	16,337	16,958	17,447	17,428	16,002	13,801	15,629	16,465	16,841	17,797	19,087	18,392	17,995	20,184	21,092	20,998	21,654	22,431	23,587	23,695	24,279	24,689	25,393	24,254	25,894	25,500	26,504	24,945	24,317	25,105	22,852	22,822	20,912	22,874	22,021	19,979	21,617	22,745	21,414	22,888	22,353	22,951	23,196	23,286	24,876	25,768	25,270	24,067	23,429	25,613	26,972	27,271	28,747	29,674	28,369	29,709	30,629	31,198	31,877	32,537	32,298
Russell Midcap® Growth Index
Account Value [Line Items]
Accumulated Value		10,000	10,329		10,299	10,126	10,823		10,853	10,777	10,905		10,729	10,903	10,269		9,872	10,494	10,516		10,279	9,501	9,650		10,338	10,332	10,501		10,500	11,020	10,988		10,982	10,536	10,994		11,032	11,400	11,728		11,793	11,968	12,253		12,290	12,495	12,583		12,939	13,301	13,746		13,820	14,602	14,143		14,120	13,987	14,510		14,566	14,879	15,736	15,669	14,118	14,477	13,163	14,676	15,536	15,746	16,454	15,507	16,596	16,984	16,675	16,485	16,790	17,626	17,832	17,999	16,758	14,259	16,491	18,148	18,573	20,057	20,603	20,314	20,339	23,071	24,178	24,097	24,509	24,041	25,392	25,004	26,703	26,978	27,849	26,500	28,358	27,160	27,255	23,738	23,450	23,826	21,144	20,325	18,806	21,107	20,416	18,683	20,151	21,248	19,972	21,715	21,501	21,797	21,481	21,495	23,156	23,857	23,070	21,946	20,826	23,367	25,139	25,003	26,883	27,526	25,927	26,204	26,641	26,803	27,469	28,384	28,880
Russell 3000® Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	256,058		256,056	248,929	263,342		260,665	261,844	265,466		261,025	265,390	249,369		242,102	261,225	262,673		257,281	242,764	242,686		259,773	261,383	266,059		266,606	277,187	277,894		278,331	272,309	284,495		290,047	295,506	306,496		306,705	309,956	313,128		315,954	321,911	322,531		330,397	337,607	347,858		351,335	369,854	356,222		349,071	350,397	360,289		362,645	374,680	387,838	388,480	359,875	367,083	332,919	361,495	374,208	379,672	394,833	369,283	395,220	401,095	392,919	399,815	408,421	423,946	436,187	435,711	400,038	345,025	390,721	411,616	421,026	444,933	477,166	459,792	449,868	504,596	527,297	524,952	541,360	560,764	589,671	592,363	606,970	617,234	634,836	606,352	647,357	637,503	662,607	623,622	607,913	627,632	571,307	570,541	522,810	571,859	550,518	499,469	540,428	568,636	535,341	572,211	558,837	573,780	579,893	582,149	621,902	644,195	631,759	601,666	585,717	640,334	674,298	681,771	718,676	741,858	709,215	742,724	765,717	779,950	796,929	813,414	807,441
Russell Midcap® Growth Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	258,217		257,485	253,147	270,570		271,333	269,428	272,628		268,237	272,584	256,724		246,806	262,340	262,912		256,970	237,517	241,240		258,458	258,301	262,537		262,497	275,497	274,688		274,551	263,396	274,847		275,802	284,997	293,192		294,817	299,191	306,335		307,243	312,376	314,580		323,475	332,527	343,641		345,492	365,039	353,581		353,004	349,670	362,748		364,150	371,967	393,406	391,733	352,942	361,919	329,079	366,893	388,407	393,647	411,349	387,685	414,911	424,598	416,864	412,117	419,757	440,640	445,802	449,973	418,945	356,463	412,282	453,698	464,332	501,428	515,069	507,857	508,479	576,778	604,447	602,429	612,717	601,030	634,800	625,099	667,577	674,453	696,223	662,504	708,955	679,001	681,382	593,454	586,250	595,662	528,591	508,130	470,146	527,680	510,396	467,076	503,784	531,192	499,310	542,882	537,522	544,927	537,034	537,365	578,899	596,416	576,753	548,658	520,661	584,180	628,466	625,080	672,078	688,149	648,184	655,094	666,036	670,073	686,721	709,604	722,000
Russell Midcap® Index
Account Value [Line Items]
Accumulated Value		10,000	10,256		10,278	10,117	10,677		10,684	10,587	10,742		10,520	10,598	10,038		9,677	10,277	10,303		10,027	9,370	9,476		10,252	10,360	10,530		10,578	11,061	11,034		11,056	10,705	11,282		11,411	11,686	12,017		11,998	12,090	12,201		12,322	12,503	12,406		12,750	12,963	13,399		13,524	14,033	13,453		13,461	13,441	13,746		13,841	14,186	14,626	14,533	13,325	13,653	12,299	13,625	14,210	14,332	14,878	13,965	14,924	15,137	14,706	14,995	15,153	15,695	16,055	15,926	14,543	11,709	13,390	14,331	14,590	15,446	15,989	15,678	15,778	17,959	18,800	18,751	19,795	20,330	21,367	21,538	21,855	22,023	22,583	21,653	22,941	22,142	23,046	21,348	21,195	21,737	20,063	20,079	18,075	19,859	19,236	17,453	19,002	20,144	19,056	20,638	20,138	19,828	19,724	19,173	20,773	21,597	20,847	19,800	18,811	20,736	22,338	22,020	23,251	24,259	22,949	23,603	23,447	24,552	25,050	25,607	25,469
Russell Midcap® Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	256,397		256,940	252,931	266,935		267,095	264,667	268,544		262,990	264,941	250,960		241,925	256,923	257,578		250,674	234,250	236,898		256,301	259,011	263,258		264,457	276,531	275,840		276,398	267,627	282,060		285,263	292,147	300,414		299,945	302,255	305,016		308,050	312,586	310,156		318,750	324,069	334,973		338,088	350,815	336,324		336,533	336,021	343,648		346,020	354,640	365,656	363,313	333,127	341,315	307,463	340,630	355,261	358,307	371,941	349,117	373,097	378,424	367,645	374,886	378,828	392,366	401,369	398,151	363,567	292,713	334,752	358,285	364,740	386,157	399,734	391,952	394,451	448,972	470,006	468,763	494,869	508,260	534,163	538,450	546,375	550,579	564,576	541,316	573,513	553,543	576,152	533,707	529,868	543,437	501,574	501,974	451,873	496,479	480,903	436,333	475,059	503,609	476,391	515,952	503,438	495,712	493,094	479,317	519,313	539,913	521,187	495,003	470,277	518,391	558,460	550,508	581,264	606,483	573,722	590,085	586,177	613,803	626,240	640,178	636,730
Russell 1000® Index
Account Value [Line Items]
Accumulated Value		10,000	10,262		10,238	9,957	10,532		10,401	10,475	10,612		10,413	10,613	9,975		9,702	10,486	10,521		10,332	9,776	9,772		10,453	10,510	10,694		10,718	11,127	11,141		11,150	10,933	11,364		11,577	11,810	12,267		12,275	12,405	12,563		12,651	12,901	12,942		13,217	13,520	13,933		14,088	14,861	14,316		13,991	14,038	14,397		14,490	14,990	15,506	15,565	14,464	14,758	13,414	14,538	15,030	15,292	15,910	14,896	15,942	16,189	15,893	16,168	16,511	17,135	17,629	17,649	16,206	14,065	15,923	16,763	17,134	18,137	19,469	18,757	18,305	20,460	21,325	21,150	21,763	22,586	23,802	23,915	24,514	25,023	25,748	24,565	26,269	25,917	26,967	25,446	24,748	25,583	23,303	23,267	21,319	23,304	22,409	20,336	21,967	23,155	21,809	23,271	22,717	23,436	23,726	23,837	25,447	26,322	25,861	24,646	24,050	26,296	27,595	27,979	29,490	30,436	29,141	30,513	31,523	31,981	32,740	33,440	33,206
Russell 1000® Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	256,545		255,948	248,917	263,300		260,021	261,867	265,293		260,316	265,334	249,373		242,538	262,162	263,028		258,296	244,393	244,309		261,328	262,749	267,351		267,956	278,164	278,533		278,754	273,318	284,093		289,430	295,250	306,679		306,873	310,117	314,075		316,268	322,531	323,540		330,430	338,008	348,316		352,199	371,533	357,893		349,769	350,958	359,917		362,244	374,746	387,658	389,130	361,594	368,953	335,350	363,453	375,759	382,301	397,740	372,394	398,538	404,727	397,314	404,201	412,767	428,367	440,737	441,213	405,158	351,617	398,080	419,084	428,351	453,434	486,715	468,926	457,618	511,506	533,130	528,739	544,063	564,652	595,047	597,872	612,853	625,584	643,690	614,123	656,735	647,925	674,170	636,160	618,703	639,581	582,568	581,683	532,967	582,607	560,237	508,400	549,174	578,883	545,222	581,776	567,932	585,898	593,158	595,921	636,168	658,044	646,533	616,149	601,257	657,411	689,865	699,486	737,259	760,894	728,516	762,821	788,068	799,537	818,489	835,989	830,148
Russell 1000® Value Index
Account Value [Line Items]
Accumulated Value		10,000	10,205		10,267	9,857	10,334		10,193	10,289	10,412		10,204	10,249	9,639		9,348	10,053	10,091		9,874	9,364	9,362		10,036	10,247	10,406		10,496	10,801	10,884		10,861	10,693	11,304		11,587	11,669	12,089		11,965	11,943	11,931		12,126	12,287	12,144		12,504	12,595	12,980		13,170	13,679	13,026		12,797	12,839	12,915		12,947	13,460	13,659	13,686	12,977	13,364	12,081	13,021	13,437	13,523	14,003	13,102	14,043	14,159	13,743	14,233	14,432	14,878	15,288	14,959	13,510	11,201	12,460	12,887	12,802	13,308	13,858	13,518	13,340	15,135	15,715	15,571	16,512	17,484	18,183	18,607	18,394	18,541	18,909	18,251	19,178	18,502	19,669	19,211	18,988	19,524	18,423	18,781	17,140	18,276	17,732	16,177	17,836	18,950	18,186	19,129	18,454	18,369	18,646	17,927	19,118	19,790	19,256	18,513	17,860	19,207	20,271	20,292	21,041	22,092	21,149	21,819	21,614	22,719	23,328	23,652	23,392
Russell 1000® Value Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	255,119		256,684	246,423	258,348		254,831	257,213	260,304		255,107	256,225	240,965		233,691	251,323	252,285		246,860	234,104	234,045		250,904	256,175	260,154		262,403	270,022	272,104		271,537	267,335	282,603		289,666	291,730	302,213		299,134	298,573	298,280		303,156	307,185	303,607		312,599	314,869	324,511		329,248	341,977	325,647		319,919	320,975	322,880		323,680	336,491	341,464	342,142	324,425	334,111	302,028	325,536	335,937	338,073	350,065	327,557	351,070	353,980	343,572	355,829	360,803	371,958	382,190	373,968	337,751	280,031	311,512	322,187	320,049	332,702	346,459	337,949	333,507	378,368	392,875	389,277	412,802	437,093	454,573	465,185	459,857	463,533	472,725	456,271	479,439	462,544	491,724	480,270	474,696	488,097	460,566	469,519	428,496	456,911	443,297	404,426	445,892	473,756	454,658	478,219	461,357	459,233	466,152	448,173	477,944	494,751	481,395	462,818	446,489	480,176	506,774	507,299	526,013	552,311	528,719	545,479	540,348	567,972	583,208	591,302	584,795
Dow Jones Industrial Average Index [Member]
Account Value [Line Items]
Accumulated Value		10,000	10,286		10,298	9,929	10,526		10,332	10,378	10,518		10,301	10,355	9,714		9,582	10,406	10,479		10,320	9,764	9,837		10,547	10,612	10,664		10,765	11,081	11,110		11,064	10,977	11,622		12,022	12,097	12,722		12,646	12,829	12,921		13,146	13,498	13,586		13,880	14,497	15,111		15,402	16,307	15,661		15,099	15,151	15,364		15,290	16,029	16,439	16,762	15,927	16,262	14,866	15,950	16,593	16,622	17,064	15,986	17,155	17,346	17,116	17,468	17,570	18,292	18,633	18,468	16,667	14,397	16,012	16,758	17,062	17,490	18,875	18,464	17,630	19,771	20,445	20,046	20,734	22,140	22,756	23,259	23,263	23,575	23,928	22,924	24,282	23,432	24,727	23,926	23,138	23,713	22,569	22,643	21,157	22,600	21,759	19,852	22,645	24,013	23,031	23,705	22,770	23,245	23,843	23,088	24,167	24,999	24,497	23,660	23,362	25,501	26,757	27,108	27,786	28,399	27,003	27,699	28,039	29,305	29,900	30,485	30,102
75/25 Blended DJIA/Treasury Index
Account Value [Line Items]
Accumulated Value		10,000	10,215		10,224	9,949	10,398		10,253	10,288	10,392		10,232	10,272	9,795		9,695	10,320	10,375		10,258	9,843	9,899		10,436	10,485	10,524		10,599	10,834	10,855		10,823	10,760	11,234		11,526	11,581	12,031		11,978	12,110	12,176		12,338	12,588	12,653		12,861	13,292	13,717		13,919	14,537	14,108		13,733	13,773	13,924		13,879	14,388	14,670	14,893	14,342	14,576	13,644	14,397	14,839	14,866	15,170	14,460	15,261	15,395	15,251	15,492	15,568	16,052	16,282	16,179	15,002	13,481	14,615	15,126	15,332	15,621	16,549	16,280	15,729	17,161	17,601	17,343	17,790	18,695	19,086	19,402	19,405	19,600	19,820	19,196	20,049	19,523	20,333	19,839	19,349	19,711	18,999	19,049	18,112	19,041	18,517	17,312	19,145	20,029	19,432	19,874	19,303	19,625	20,020	19,564	20,273	20,817	20,526	20,024	19,857	21,243	22,053	22,294	22,735	23,137	22,308	22,767	23,000	23,804	24,196	24,577	24,369
50/50 Blended DJIA/Treasury Index
Account Value [Line Items]
Accumulated Value		10,000	10,144		10,145	9,969	10,267		10,173	10,199	10,270		10,164	10,192	9,876		9,814	10,235	10,263		10,185	9,921	9,959		10,325	10,362	10,386		10,447	10,600	10,613		10,595	10,556	10,863		11,053	11,096	11,385		11,349	11,436	11,478		11,580	11,743	11,787		11,916	12,182	12,437		12,559	12,932	12,677		12,460	12,485	12,587		12,564	12,876	13,055	13,187	12,872	13,022	12,486	12,958	13,232	13,267	13,458	13,054	13,557	13,637	13,572	13,720	13,783	14,070	14,215	14,169	13,512	12,658	13,366	13,675	13,802	13,979	14,532	14,376	14,052	14,908	15,163	15,016	15,276	15,795	16,018	16,195	16,196	16,307	16,429	16,083	16,557	16,263	16,704	16,411	16,128	16,298	15,890	15,933	15,370	15,907	15,594	14,877	15,929	16,435	16,132	16,397	16,077	16,315	16,540	16,280	16,680	17,006	16,870	16,611	16,545	17,355	17,844	17,997	18,227	18,464	18,031	18,306	18,459	18,943	19,197	19,450	19,327
S&P 500® Energy Index
Account Value [Line Items]
Accumulated Value		10,000	9,151		9,197	8,754	9,109		8,934	9,529	9,075		8,766	8,096	7,757		7,240	8,068	8,049		7,255	7,036	6,904		7,546	8,203	8,155		8,423	8,260	8,355		8,613	8,362	9,065		9,239	8,907	8,712		8,622	8,373	8,088		8,074	8,276	7,847		8,627	8,569	8,720		9,146	9,495	8,468		8,608	9,414	9,700		9,769	9,908	9,581	9,829	8,722	8,578	7,491	8,323	8,541	8,722	8,728	7,755	8,474	8,323	7,652	7,940	7,759	7,900	8,376	7,449	6,365	4,150	5,386	5,487	5,416	5,139	5,086	4,348	4,156	5,321	5,555	5,765	7,072	7,269	7,312	7,734	8,091	7,422	7,270	7,956	8,781	8,334	8,591	10,232	10,961	11,943	11,759	13,614	11,326	12,427	12,778	11,592	14,485	14,668	14,236	14,636	13,595	13,571	14,019	12,613	13,451	14,446	14,708	15,094	14,193	14,050	14,047	13,994	14,439	15,970	15,848	15,786	15,583	15,912	15,641	15,222	15,342
S&P 500® Energy Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	228,787		229,924	218,865	227,736		223,364	238,218	226,872		219,161	202,394	193,941		181,002	201,715	201,226		181,370	175,891	172,591		188,657	205,072	203,883		210,573	206,509	208,889		215,325	209,061	226,631		230,991	222,681	217,795		215,557	209,329	202,210		201,852	206,901	196,174		215,667	214,241	218,016		228,660	237,380	211,694		215,213	235,348	242,503		244,224	247,693	239,526	245,723	218,043	214,455	187,282	208,091	213,542	218,048	218,199	193,891	211,866	208,089	191,302	198,516	193,976	197,503	209,406	186,229	159,121	103,754	134,651	137,187	135,408	128,465	127,154	108,700	103,902	133,030	138,881	144,138	176,796	181,732	182,805	193,347	202,269	185,546	181,752	198,911	219,526	208,357	214,770	255,800	274,031	298,587	293,990	340,348	283,155	310,676	319,465	289,808	362,142	366,696	355,909	365,911	339,871	339,291	350,491	315,320	336,274	361,147	367,698	377,366	354,826	351,263	351,187	349,865	360,978	399,250	396,200	394,666	389,578	397,804	391,045	380,555	383,554
Alerian US Midstream Energy Index
Account Value [Line Items]
Accumulated Value		10,000																7,280																7,351																7,175															7,420												7,354												4,626												8,788												11,093												12,337												17,806
Alerian US Midstream Energy Index [Member]
Account Value [Line Items]
Accumulated Value		250,000																181,997																183,773																179,363															185,512												183,844												115,648												219,710												277,314												308,432												445,154
AGA Stock Index
Account Value [Line Items]
Accumulated Value		10,000	9,897		10,080	10,065	9,872		9,917	10,038	9,999		9,508	9,665	9,256		8,956	9,416	8,953		8,581	8,793	8,991		9,663	9,768	9,884		10,635	10,640	10,277		10,570	10,362	10,216		10,492	10,743	11,030		11,101	11,127	11,369		11,183	11,480	11,642		11,461	11,586	11,805		11,371	11,025	10,403		10,652	10,979	11,122		11,458	11,607	11,677	11,585	11,403	11,750	11,076	11,917	12,272	12,690	12,750	12,596	13,088	12,841	13,011	13,475	13,306	12,955	13,586	13,962	12,551	10,976	11,673	11,875	11,467	11,954	11,803	11,553	11,768	12,530	12,465	12,346	12,124	13,456	14,096	14,200	13,892	14,032	14,201	13,655	14,255	13,888	15,048	15,384	15,525	17,080	16,713	17,497	16,004	17,168	16,941	15,103	15,868	16,814	16,126	16,409	15,679	16,023	16,435	15,506	16,040	16,449	15,776	15,140	15,183	16,030	16,303	15,851	16,076	16,832	16,831	17,497	17,231	18,344	19,111	19,706	19,872
AGA Stock Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	247,414		252,009	251,623	246,810		247,926	250,962	249,977		237,696	241,625	231,397		223,911	235,398	223,825		214,518	219,828	224,777		241,574	244,205	247,102		265,877	265,999	256,914		264,251	259,041	255,397		262,294	268,565	275,749		277,514	278,174	284,230		279,571	286,989	291,046		286,528	289,657	295,120		284,264	275,620	260,078		266,300	274,484	278,046		286,456	290,164	291,921	289,620	285,069	293,760	276,909	297,914	306,793	317,255	318,747	314,912	327,212	321,017	325,276	336,869	332,657	323,877	339,643	349,058	313,782	274,400	291,837	296,885	286,668	298,861	295,078	288,832	294,201	313,239	311,632	308,658	303,092	336,405	352,399	355,005	347,310	350,796	355,025	341,386	356,364	347,202	376,194	384,604	388,135	427,005	417,834	437,427	400,089	429,195	423,529	377,566	396,688	420,338	403,152	410,216	391,964	400,570	410,866	387,651	400,989	411,229	394,400	378,512	379,577	400,743	407,569	396,281	401,908	420,791	420,783	437,433	430,771	458,590	477,781	492,654	496,789
Russell/Nomura Total Market Index
Account Value [Line Items]
Accumulated Value		10,000	9,950		9,801	10,015	10,658		10,804	11,282	11,401		11,256	11,273	10,704		9,997	10,979	10,944		10,949	10,122	9,811		10,334	10,669	10,712		10,489	11,033	11,129		11,423	11,571	11,349		11,312	11,698	11,934		11,927	12,132	12,475		12,705	12,923	12,936		13,255	13,906	14,223		14,384	15,080	14,746		14,559	14,619	14,469		14,105	14,193	14,135	14,562	13,228	13,365	12,310	13,145	13,238	13,243	13,386	12,845	13,339	13,363	13,154	13,764	14,357	14,516	14,780	14,477	13,028	12,264	13,046	13,869	13,806	13,703	14,584	14,777	14,555	16,263	16,855	16,741	17,012	17,192	17,030	17,093	17,167	16,920	17,419	17,841	17,345	16,812	17,082	16,140	16,059	15,928	14,464	14,928	13,682	14,564	14,128	12,812	13,135	14,452	14,447	15,331	14,726	15,381	15,490	15,628	16,202	16,751	16,371	16,113	15,470	16,679	17,335	17,878	18,502	19,097	18,245	18,445	18,313	19,439	19,663	19,723	18,799
Tokyo Stock Price Index (TOPIX)
Account Value [Line Items]
Accumulated Value		10,000	9,994		9,926	10,142	10,732		10,923	11,298	11,446		11,329	11,391	10,788		10,092	11,065	10,985		11,015	10,154	9,871		10,394	10,708	10,788		10,542	11,206	11,163		11,446	11,612	11,298		11,422	11,858	12,043		12,025	12,172	12,560		12,726	12,997	13,046		13,305	13,902	14,326		14,455	15,077	14,849		14,597	14,689	14,548		14,160	14,197	14,185	14,615	13,329	13,415	12,388	13,188	13,231	13,317	13,434	12,898	13,360	13,378	13,225	13,772	14,455	14,548	14,825	14,591	13,157	12,357	13,015	13,800	13,755	13,471	14,528	14,789	14,506	16,163	16,808	16,614	16,835	17,158	16,867	17,072	17,026	16,843	17,360	17,837	17,207	16,656	16,990	16,159	16,096	15,931	14,404	14,785	13,713	14,458	14,108	12,769	13,068	14,331	14,464	15,325	14,769	15,373	15,431	15,583	16,200	16,726	16,394	16,076	15,366	16,595	17,363	18,054	18,501	19,107	18,209	18,445	18,281	19,439	19,505	19,551	18,704
Russell/Nomura Small Cap Index
Account Value [Line Items]
Accumulated Value		10,000	9,816		9,866	10,101	10,526		10,656	10,992	11,070		11,228	11,205	10,882		10,452	11,139	11,345		11,395	10,622	10,417		11,188	11,490	11,649		11,539	12,100	11,752		12,442	12,671	12,245		12,277	12,704	13,181		13,167	13,456	13,867		14,236	14,588	14,833		15,216	15,790	16,215		16,615	17,375	17,066		16,967	16,979	16,893		16,460	16,378	16,154	16,432	14,745	15,145	13,604	14,353	14,625	14,508	14,625	14,015	14,427	14,521	14,139	14,745	15,535	15,806	16,099	15,392	13,355	12,801	13,650	14,753	14,485	14,190	15,176	15,850	15,434	16,339	16,898	16,759	16,889	17,409	17,177	16,962	17,279	17,145	17,557	17,816	17,255	16,229	16,423	15,482	15,748	15,116	13,891	14,215	13,443	14,275	13,966	13,018	13,039	14,238	14,489	15,152	14,627	15,189	15,288	14,868	15,221	15,919	15,777	15,472	14,908	15,922	16,719	16,678	16,991	17,475	16,664	16,643	16,536	17,790	18,060	18,487	17,412
Russell/Nomura Small Cap Index [Member]
Account Value [Line Items]
Accumulated Value		250,000	245,405		246,662	252,516	263,143		266,407	274,802	276,746		280,708	280,137	272,049		261,312	278,464	283,617		284,873	265,552	260,426		279,706	287,240	291,228		288,470	302,490	293,796		311,060	316,786	306,131		306,914	317,595	329,529		329,167	336,404	346,685		355,897	364,700	370,827		380,398	394,751	405,375		415,364	434,387	426,650		424,167	424,465	422,333		411,500	409,447	403,861	410,795	368,629	378,614	340,099	358,830	365,613	362,694	365,625	350,374	360,684	363,019	353,481	368,623	388,387	395,153	402,467	384,792	333,884	320,037	341,254	368,821	362,113	354,760	379,402	396,244	385,855	408,486	422,462	418,982	422,224	435,237	429,432	424,045	431,979	428,614	438,916	445,404	431,379	405,724	410,575	387,061	393,688	377,901	347,287	355,382	336,076	356,871	349,141	325,439	325,968	355,954	362,215	378,789	365,686	379,719	382,190	371,688	380,532	397,966	394,435	386,806	372,691	398,060	417,978	416,952	424,778	436,887	416,597	416,067	413,394	444,748	451,490	462,165	435,298
Tokyo Stock Price Index (TOPIX) [Member]
Account Value [Line Items]
Accumulated Value		250,000	249,846		248,154	253,538	268,308		273,077	282,462	286,154		283,231	284,769	269,692		252,308	276,615	274,615		275,385	253,846	246,769		259,846	267,692	269,692		263,538	280,154	279,077		286,154	290,308	282,462		285,538	296,462	301,077		300,615	304,308	314,000		318,154	324,923	326,154		332,615	347,538	358,154		361,385	376,923	371,231		364,923	367,231	363,692		354,000	354,923	354,615	365,385	333,231	335,385	309,692	329,692	330,769	332,923	335,846	322,462	334,000	334,462	330,615	344,308	361,385	363,692	370,615	364,769	328,923	308,923	325,385	345,012	343,877	336,763	363,211	369,729	362,645	404,068	420,200	415,346	420,872	428,942	421,675	426,789	425,652	421,085	433,991	445,934	430,172	416,406	424,749	403,985	402,408	398,265	360,109	369,620	342,825	361,457	352,692	319,223	326,711	358,277	361,602	383,120	369,226	384,325	385,782	389,577	405,012	418,162	409,860	401,898	384,160	414,875	434,063	451,342	462,515	477,686	455,215	461,128	457,020	485,968	487,626	488,769	467,606
Russell 1000® Index Financials
Account Value [Line Items]
Accumulated Value		10,000	10,249		10,405	9,845	10,384		10,348	10,348	10,541		10,488	10,855	10,155		9,900	10,541	10,711		10,478	9,624	9,397		10,090	10,373	10,608		10,307	10,704	11,030		10,844	10,878	11,780		12,211	12,298	12,912		12,635	12,628	12,584		13,162	13,441	13,344		13,816	14,187	14,648		14,844	15,603	15,122		14,782	14,778	14,881		14,838	15,389	15,811	15,532	14,715	15,140	13,640	14,903	15,381	15,356	16,365	15,604	16,475	16,898	16,526	16,931	17,234	17,888	18,245	18,193	16,454	13,124	14,518	15,158	15,263	15,887	16,583	15,834	15,849	18,408	19,563	19,255	21,420	22,650	24,091	25,119	24,347	24,278	25,575	25,069	27,081	25,662	26,418	26,337	25,906	25,945	23,293	24,085	21,499	23,073	22,623	20,867	23,366	24,916	23,538	25,257	24,697	22,321	22,952	22,056	23,531	25,037	24,253	23,702	23,032	25,599	27,177	27,766	29,058	30,663	29,226	30,545	30,438	32,550	33,814	33,520	34,454
Russell 1000® Index Financials [Member]
Account Value [Line Items]
Accumulated Value		250,000	256,223		260,127	246,132	259,588		258,707	258,701	263,515		262,205	271,370	253,887		247,500	263,515	267,776		261,947	240,597	234,936		252,238	259,321	265,203		257,684	267,588	275,754		271,108	271,952	294,498		305,263	307,446	322,804		315,872	315,704	314,610		329,045	336,037	333,599		345,407	354,670	366,206		371,096	390,069	378,051		369,554	369,461	372,023		370,938	384,723	395,278	388,299	367,868	378,503	341,008	372,576	384,516	383,899	409,114	390,090	411,884	422,461	413,138	423,285	430,858	447,203	456,123	454,822	411,356	328,096	362,948	378,955	381,584	397,166	414,587	395,853	396,221	460,202	489,084	481,381	535,505	566,240	602,267	627,986	608,681	606,953	639,387	626,724	677,037	641,551	660,458	658,436	647,648	648,621	582,324	602,136	537,479	576,816	565,582	521,665	584,146	622,897	588,462	631,414	617,429	558,026	573,804	551,408	588,264	625,927	606,318	592,561	575,808	639,987	679,432	694,153	726,453	766,580	730,658	763,622	760,941	813,749	845,348	838,007	861,347
Russell 2000® Index Financials
Account Value [Line Items]
Accumulated Value		10,000	9,950		10,206	9,796	10,163		10,387	10,184	10,247		10,452	10,585	9,927		9,933	10,431	10,792		10,267	9,576	9,533		10,298	10,463	10,768		10,713	11,282	11,671		11,513	11,293	12,682		13,464	13,269	13,618		13,340	13,385	12,933		13,539	13,654	13,288		14,101	14,183	14,588		14,242	14,442	13,736		14,046	14,202	14,946		14,972	15,247	15,601	15,058	13,900	14,347	12,700	14,035	14,644	14,115	14,800	13,975	14,671	14,850	14,258	14,855	15,239	15,528	15,775	15,294	13,873	10,374	11,221	11,249	11,705	11,616	12,115	11,431	12,515	14,279	15,467	15,458	17,295	18,451	18,897	19,318	18,682	18,276	19,029	18,958	20,061	19,464	20,099	19,418	19,485	18,819	17,020	17,608	16,335	17,900	17,352	16,070	18,092	18,399	16,989	17,942	17,977	15,508	15,014	14,214	15,302	17,420	16,228	15,444	14,917	16,463	19,069	18,102	18,016	18,717	17,525	18,332	18,491	21,564	21,631	21,412	21,687
Russell 2000® Index Financials [Member]
Account Value [Line Items]
Accumulated Value		250,000	248,750		255,148	244,890	254,067		259,663	254,600	256,177		261,288	264,615	248,169		248,324	260,770	269,809		256,676	239,391	238,323		257,444	261,563	269,200		267,822	282,050	291,781		287,826	282,315	317,057		336,609	331,728	340,450		333,506	334,627	323,318		338,482	341,356	332,192		352,529	354,568	364,705		356,062	361,041	343,391		351,157	355,047	373,655		374,291	381,180	390,034	376,456	347,510	358,686	317,494	350,878	366,106	352,880	370,005	349,372	366,768	371,249	356,446	371,369	380,969	388,205	394,366	382,352	346,834	259,339	280,527	281,223	292,634	290,402	302,873	285,783	312,881	356,984	386,663	386,459	432,376	461,265	472,432	482,961	467,041	456,892	475,732	473,938	501,522	486,594	502,480	485,449	487,128	470,465	425,497	440,188	408,387	447,496	433,795	401,750	452,298	459,986	424,729	448,551	449,421	387,690	375,354	355,354	382,546	435,501	405,703	386,107	372,932	411,579	476,736	452,547	450,391	467,920	438,137	458,289	462,273	539,090	540,778	535,292	542,171
NASDAQ Composite Index [Member]
Account Value [Line Items]
Accumulated Value		10,000	10,366		10,252	10,039	10,767		10,641	10,732	11,029		10,857	11,170	10,422		10,087	11,039	11,180		10,966	10,109	10,006		10,700	10,498	10,899		10,675	11,385	11,519		11,744	11,478	11,799		11,939	12,458	12,945		13,148	13,456	13,815		13,695	14,164	14,367		14,526	15,051	15,403		15,477	16,623	16,334		15,878	15,890	16,764		16,927	17,298	18,311	18,182	16,516	16,597	15,038	16,509	17,103	17,565	18,403	16,970	18,245	18,638	18,180	18,277	18,956	19,836	20,556	20,972	19,658	17,687	20,426	21,835	23,160	24,748	27,148	25,763	25,181	28,179	29,789	30,218	30,523	30,669	32,335	31,869	33,636	34,036	35,426	33,560	36,007	36,127	36,395	33,134	32,024	33,139	28,752	28,196	25,756	28,946	27,635	24,749	25,723	26,883	24,554	27,187	26,914	28,739	28,758	30,462	32,490	33,814	33,119	31,210	30,350	33,638	35,514	35,885	38,117	38,822	37,121	39,713	42,108	41,802	42,109	43,270	43,056
Nasdaq Composite Index [Member]
Account Value [Line Items]
Accumulated Value		$ 250,000	$ 259,145		$ 256,312	$ 250,968	$ 269,167		$ 266,024	$ 268,311	$ 275,725		$ 271,430	$ 279,252	$ 260,538		$ 252,187	$ 275,986	$ 279,507		$ 274,159	$ 252,731	$ 250,140		$ 267,497	$ 262,442	$ 272,483		$ 266,872	$ 284,619	$ 287,964		$ 293,608	$ 286,938	$ 294,972		$ 298,469	$ 311,438	$ 323,615		$ 328,695	$ 336,406	$ 345,378		$ 342,384	$ 354,098	$ 359,178		$ 363,147	$ 376,268	$ 385,085		$ 386,928	$ 415,566	$ 408,348		$ 396,938	$ 397,248	$ 419,090		$ 423,185	$ 432,462	$ 457,774	$ 454,551	$ 412,903	$ 414,936	$ 375,939	$ 412,726	$ 427,574	$ 439,123	$ 460,085	$ 424,262	$ 456,115	$ 465,943	$ 454,489	$ 456,928	$ 473,890	$ 495,902	$ 513,888	$ 524,306	$ 491,449	$ 442,176	$ 510,659	$ 545,866	$ 579,010	$ 618,697	$ 678,704	$ 644,077	$ 629,537	$ 704,486	$ 744,717	$ 755,453	$ 763,087	$ 766,714	$ 808,373	$ 796,718	$ 840,904	$ 850,903	$ 885,641	$ 838,989	$ 900,181	$ 903,186	$ 909,874	$ 828,358	$ 800,611	$ 828,482	$ 718,791	$ 704,890	$ 643,908	$ 723,659	$ 690,869	$ 618,713	$ 643,081	$ 672,080	$ 613,843	$ 679,673	$ 672,841	$ 718,476	$ 718,950	$ 761,559	$ 812,238	$ 845,346	$ 827,980	$ 780,245	$ 758,746	$ 840,942	$ 887,855	$ 897,122	$ 952,928	$ 970,539	$ 928,022	$ 992,825	$ 1,052,711	$ 1,045,052	$ 1,052,737	$ 1,081,751	$ 1,076,404

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)	12 Months Ended	44 Months Ended	60 Months Ended	120 Months Ended
	Oct. 31, 2024	Oct. 31, 2024	Oct. 31, 2024	Oct. 31, 2024
Hennessy Cornerstone Growth Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	49.17%		19.55%	10.65%
Hennessy Cornerstone Growth Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	49.64%		19.93%	11%
Hennessy Focus Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	37.93%		8.66%	9.32%
Hennessy Focus Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	38.44%		9.06%	9.72%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	54.22%		24.52%	12.91%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	54.74%		24.97%	13.31%
Hennessy Cornerstone Large Growth Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	23.34%		11.59%	9.29%
Hennessy Cornerstone Large Growth Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	23.62%		11.90%	9.57%
Hennessy Cornerstone Value Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	23.38%		10.20%	8.28%
Hennessy Cornerstone Value Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	23.66%		10.44%	8.51%
Hennessy Total Return Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	15.52%		4.61%	5.75%
Hennessy Equity and Income Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	20.43%		6.54%	5.93%
Hennessy Equity and Income Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	20.85%		6.93%	6.33%
Hennessy Balanced Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	11.47%		3.13%	3.98%
Hennessy Energy Transition Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	6.85%		15.89%	3.31%
Hennessy Energy Transition Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	7.21%		16.24%	3.61%
Hennessy Midstream Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	24.81%		13.22%	2.35%
Hennessy Midstream Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	25.30%		13.53%	2.62%
Hennessy Gas Utility Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	30.34%		7.43%	6.01%
Hennessy Gas Utility Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	30.74%		7.77%	6.27%
Hennessy Japan Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	31.08%		4.50%	7.85%
Hennessy Japan Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	31.59%		4.91%	8.25%
Hennessy Japan Small Cap Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	13.79%		2.20%	7.16%
Hennessy Japan Small Cap Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	14.23%		2.61%	7.53%
Hennessy Large Cap Financial Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	49.91%		6.77%	7.12%
Hennessy Large Cap Financial Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	50.45%		7.12%	7.48%
Hennessy Small Cap Financial Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	43.17%		9.22%	8.50%
Hennessy Small Cap Financial Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	43.64%		9.61%	8.89%
Hennessy Technology Fund - Investor Class
Average Annual Return [Line Items]
Average Annual Return, Percent	31.52%		12.36%	11.13%
Hennessy Technology Fund - Institutional Class
Average Annual Return [Line Items]
Average Annual Return, Percent	31.84%		12.63%	11.44%
Hennessy Stance ESG ETF
Average Annual Return [Line Items]
Average Annual Return, Percent	28.18%	6.17%
Russell 2000® Index
Average Annual Return [Line Items]
Average Annual Return, Percent	34.07%		8.50%	7.94%
S&P 500® Index
Average Annual Return [Line Items]
Average Annual Return, Percent	38.02%	12.20%	15.27%	13%
Russell 3000® Index
Average Annual Return [Line Items]
Average Annual Return, Percent	37.86%		14.60%	12.44%
Russell Midcap® Growth Index
Average Annual Return [Line Items]
Average Annual Return, Percent	38.67%		11.46%	11.19%
Russell Midcap® Index
Average Annual Return [Line Items]
Average Annual Return, Percent	35.39%		10.94%	9.80%
Russell 1000® Index
Average Annual Return [Line Items]
Average Annual Return, Percent	38.07%		15%	12.75%
Russell 1000® Value Index
Average Annual Return [Line Items]
Average Annual Return, Percent	30.98%		10.14%	8.87%
Dow Jones Industrial Average Index [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	28.85%		11.37%	11.65%
75/25 Blended DJIA/Treasury Index
Average Annual Return [Line Items]
Average Annual Return, Percent	22.72%		9.38%	9.32%
50/50 Blended DJIA/Treasury Index
Average Annual Return [Line Items]
Average Annual Return, Percent	16.82%		7%	6.81%
S&P 500® Energy Index
Average Annual Return [Line Items]
Average Annual Return, Percent	8.09%		14.61%	4.37%
Alerian US Midstream Energy Index
Average Annual Return [Line Items]
Average Annual Return, Percent	44.33%		19.35%	5.94%
AGA Stock Index
Average Annual Return [Line Items]
Average Annual Return, Percent	30.88%		8.35%	7.11%
Russell/Nomura Total Market Index
Average Annual Return [Line Items]
Average Annual Return, Percent	21.52%		5.54%	6.52%
Tokyo Stock Price Index (TOPIX)
Average Annual Return [Line Items]
Average Annual Return, Percent	21.72%		5.29%	6.46%
Russell/Nomura Small Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent	16.80%		2.31%	5.70%
Russell 1000® Index Financials
Average Annual Return [Line Items]
Average Annual Return, Percent	49.59%		14.86%	13.17%
Russell 2000® Index Financials
Average Annual Return [Line Items]
Average Annual Return, Percent	45.38%		7.31%	8.05%
NASDAQ Composite Index [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	41.87%		17.83%	15.72%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Oct. 31, 2024
Hennessy Cornerstone Growth Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.11%
Hennessy Cornerstone Growth Fund - Investor Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.88%
Hennessy Cornerstone Growth Fund - Investor Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.78%
Hennessy Cornerstone Growth Fund - Investor Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Hennessy Cornerstone Growth Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.97%
Hennessy Cornerstone Growth Fund - Investor Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.53%
Hennessy Cornerstone Growth Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	33.20%
Hennessy Cornerstone Growth Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.78%
Hennessy Cornerstone Growth Fund - Investor Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.16%
Hennessy Cornerstone Growth Fund - Investor Class | Real Estate [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.49%
Hennessy Cornerstone Growth Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.34%
Hennessy Cornerstone Growth Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.01%)
Hennessy Cornerstone Growth Fund - Institutional Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.11%
Hennessy Cornerstone Growth Fund - Institutional Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.88%
Hennessy Cornerstone Growth Fund - Institutional Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.78%
Hennessy Cornerstone Growth Fund - Institutional Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Hennessy Cornerstone Growth Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.97%
Hennessy Cornerstone Growth Fund - Institutional Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.53%
Hennessy Cornerstone Growth Fund - Institutional Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	33.20%
Hennessy Cornerstone Growth Fund - Institutional Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.78%
Hennessy Cornerstone Growth Fund - Institutional Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.16%
Hennessy Cornerstone Growth Fund - Institutional Class | Real Estate [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.49%
Hennessy Cornerstone Growth Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.34%
Hennessy Cornerstone Growth Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.01%)
Hennessy Focus Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.53%
Hennessy Focus Fund - Investor Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.52%
Hennessy Focus Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.77%
Hennessy Focus Fund - Investor Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.58%
Hennessy Focus Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.48%
Hennessy Focus Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.03%
Hennessy Focus Fund - Investor Class | Real Estate [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.17%
Hennessy Focus Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.08%
Hennessy Focus Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.16%)
Hennessy Focus Fund - Institutional Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.53%
Hennessy Focus Fund - Institutional Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.52%
Hennessy Focus Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.77%
Hennessy Focus Fund - Institutional Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.58%
Hennessy Focus Fund - Institutional Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.48%
Hennessy Focus Fund - Institutional Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.03%
Hennessy Focus Fund - Institutional Class | Real Estate [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.17%
Hennessy Focus Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.08%
Hennessy Focus Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.16%)
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.37%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.96%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.75%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.23%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.52%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.50%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.23%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.77%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Real Estate [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.89%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.85%
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.11%)
Hennessy Cornerstone Mid Cap 30 Fund - Investor Class | Utilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.93%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.37%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.96%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.75%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.23%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.52%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.50%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.23%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.77%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Real Estate [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.89%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.85%
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.11%)
Hennessy Cornerstone Mid Cap 30 Fund - Institutional Class | Utilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.93%
Hennessy Cornerstone Large Growth Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.07%
Hennessy Cornerstone Large Growth Fund - Investor Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.60%
Hennessy Cornerstone Large Growth Fund - Investor Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.24%
Hennessy Cornerstone Large Growth Fund - Investor Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
Hennessy Cornerstone Large Growth Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.22%
Hennessy Cornerstone Large Growth Fund - Investor Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.41%
Hennessy Cornerstone Large Growth Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.82%
Hennessy Cornerstone Large Growth Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.80%
Hennessy Cornerstone Large Growth Fund - Investor Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.54%
Hennessy Cornerstone Large Growth Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.81%
Hennessy Cornerstone Large Growth Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.06%)
Hennessy Cornerstone Large Growth Fund - Institutional Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.07%
Hennessy Cornerstone Large Growth Fund - Institutional Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.60%
Hennessy Cornerstone Large Growth Fund - Institutional Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.24%
Hennessy Cornerstone Large Growth Fund - Institutional Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
Hennessy Cornerstone Large Growth Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.22%
Hennessy Cornerstone Large Growth Fund - Institutional Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.41%
Hennessy Cornerstone Large Growth Fund - Institutional Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.82%
Hennessy Cornerstone Large Growth Fund - Institutional Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.80%
Hennessy Cornerstone Large Growth Fund - Institutional Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.54%
Hennessy Cornerstone Large Growth Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.81%
Hennessy Cornerstone Large Growth Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.06%)
Hennessy Cornerstone Value Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.68%
Hennessy Cornerstone Value Fund - Investor Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.44%
Hennessy Cornerstone Value Fund - Investor Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	20.10%
Hennessy Cornerstone Value Fund - Investor Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.86%
Hennessy Cornerstone Value Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.76%
Hennessy Cornerstone Value Fund - Investor Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.91%
Hennessy Cornerstone Value Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.53%
Hennessy Cornerstone Value Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.52%
Hennessy Cornerstone Value Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.06%
Hennessy Cornerstone Value Fund - Investor Class | Other Assets in Excess of Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.14%
Hennessy Cornerstone Value Fund - Institutional Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.68%
Hennessy Cornerstone Value Fund - Institutional Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.44%
Hennessy Cornerstone Value Fund - Institutional Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	20.10%
Hennessy Cornerstone Value Fund - Institutional Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.86%
Hennessy Cornerstone Value Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.76%
Hennessy Cornerstone Value Fund - Institutional Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.91%
Hennessy Cornerstone Value Fund - Institutional Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.53%
Hennessy Cornerstone Value Fund - Institutional Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.52%
Hennessy Cornerstone Value Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.06%
Hennessy Cornerstone Value Fund - Institutional Class | Other Assets in Excess of Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.14%
Hennessy Total Return Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.44%
Hennessy Total Return Fund - Investor Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.92%
Hennessy Total Return Fund - Investor Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.92%
Hennessy Total Return Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.75%
Hennessy Total Return Fund - Investor Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.97%
Hennessy Total Return Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.17%
Hennessy Total Return Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.35%
Hennessy Total Return Fund - Investor Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.36%
Hennessy Total Return Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(44.32%)
Hennessy Total Return Fund - Investor Class | Money Market Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.47%
Hennessy Total Return Fund - Investor Class | U.S. Treasury Bills [Member]
Holdings [Line Items]
Percent of Net Asset Value	72.90%
Hennessy Equity and Income Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.06%
Hennessy Equity and Income Fund - Investor Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.78%
Hennessy Equity and Income Fund - Investor Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.26%
Hennessy Equity and Income Fund - Investor Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.36%
Hennessy Equity and Income Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.10%
Hennessy Equity and Income Fund - Investor Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.94%
Hennessy Equity and Income Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.91%
Hennessy Equity and Income Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Hennessy Equity and Income Fund - Investor Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Hennessy Equity and Income Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.53%
Hennessy Equity and Income Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.80%)
Hennessy Equity and Income Fund - Investor Class | Collateralized Mortgage-Backed Securities [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.03%
Hennessy Equity and Income Fund - Investor Class | U.S. Treasury Obligations [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.67%
Hennessy Equity and Income Fund - Institutional Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.06%
Hennessy Equity and Income Fund - Institutional Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.78%
Hennessy Equity and Income Fund - Institutional Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.26%
Hennessy Equity and Income Fund - Institutional Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.36%
Hennessy Equity and Income Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.10%
Hennessy Equity and Income Fund - Institutional Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.94%
Hennessy Equity and Income Fund - Institutional Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.91%
Hennessy Equity and Income Fund - Institutional Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Hennessy Equity and Income Fund - Institutional Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Hennessy Equity and Income Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.53%
Hennessy Equity and Income Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.80%)
Hennessy Equity and Income Fund - Institutional Class | Collateralized Mortgage-Backed Securities [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.03%
Hennessy Equity and Income Fund - Institutional Class | U.S. Treasury Obligations [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.67%
Hennessy Balanced Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.04%
Hennessy Balanced Fund - Investor Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.77%
Hennessy Balanced Fund - Investor Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.39%
Hennessy Balanced Fund - Investor Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.97%
Hennessy Balanced Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.26%
Hennessy Balanced Fund - Investor Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.05%
Hennessy Balanced Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.09%
Hennessy Balanced Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.25%
Hennessy Balanced Fund - Investor Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.51%
Hennessy Balanced Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	51.40%
Hennessy Balanced Fund - Investor Class | Other Assets in Excess of Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.19%
Hennessy Energy Transition Fund - Investor Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.44%
Hennessy Energy Transition Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.37%
Hennessy Energy Transition Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.12%)
Hennessy Energy Transition Fund - Investor Class | Utilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.75%
Hennessy Energy Transition Fund - Investor Class | Downstream [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.81%
Hennessy Energy Transition Fund - Investor Class | Exploration and Production [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.80%
Hennessy Energy Transition Fund - Investor Class | Integrated [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Hennessy Energy Transition Fund - Investor Class | Midstream [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.42%
Hennessy Energy Transition Fund - Investor Class | Oil Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.67%
Hennessy Energy Transition Fund - Institutional Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.44%
Hennessy Energy Transition Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.37%
Hennessy Energy Transition Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.12%)
Hennessy Energy Transition Fund - Institutional Class | Utilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.75%
Hennessy Energy Transition Fund - Institutional Class | Downstream [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.81%
Hennessy Energy Transition Fund - Institutional Class | Exploration and Production [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.80%
Hennessy Energy Transition Fund - Institutional Class | Integrated [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Hennessy Energy Transition Fund - Institutional Class | Midstream [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.42%
Hennessy Energy Transition Fund - Institutional Class | Oil Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.67%
Hennessy Midstream Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.80%
Hennessy Midstream Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(7.90%)
Hennessy Midstream Fund - Investor Class | Crude Oil and Refined Products [Member]
Holdings [Line Items]
Percent of Net Asset Value	21%
Hennessy Midstream Fund - Investor Class | Geathering and Processing [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.40%
Hennessy Midstream Fund - Investor Class | Natural Gas/NGL Transportation [Member]
Holdings [Line Items]
Percent of Net Asset Value	56.70%
Hennessy Midstream Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.80%
Hennessy Midstream Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(7.90%)
Hennessy Midstream Fund - Institutional Class | Crude Oil and Refined Products [Member]
Holdings [Line Items]
Percent of Net Asset Value	21%
Hennessy Midstream Fund - Institutional Class | Geathering and Processing [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.40%
Hennessy Midstream Fund - Institutional Class | Natural Gas/NGL Transportation [Member]
Holdings [Line Items]
Percent of Net Asset Value	56.70%
Hennessy Gas Utility Fund - Investor Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	34.01%
Hennessy Gas Utility Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.82%
Hennessy Gas Utility Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.06%
Hennessy Gas Utility Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.33%
Hennessy Gas Utility Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.01%)
Hennessy Gas Utility Fund - Investor Class | Utilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	59.79%
Hennessy Gas Utility Fund - Institutional Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	34.01%
Hennessy Gas Utility Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.82%
Hennessy Gas Utility Fund - Institutional Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.06%
Hennessy Gas Utility Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.33%
Hennessy Gas Utility Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.01%)
Hennessy Gas Utility Fund - Institutional Class | Utilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	59.79%
Hennessy Japan Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.59%
Hennessy Japan Fund - Investor Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.10%
Hennessy Japan Fund - Investor Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.40%
Hennessy Japan Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.10%
Hennessy Japan Fund - Investor Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.84%
Hennessy Japan Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.90%
Hennessy Japan Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.99%
Hennessy Japan Fund - Investor Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.72%
Hennessy Japan Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.74%
Hennessy Japan Fund - Investor Class | Other Assets in Excess of Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.71%
Hennessy Japan Fund - Institutional Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.59%
Hennessy Japan Fund - Institutional Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.10%
Hennessy Japan Fund - Institutional Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.40%
Hennessy Japan Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.10%
Hennessy Japan Fund - Institutional Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.84%
Hennessy Japan Fund - Institutional Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.90%
Hennessy Japan Fund - Institutional Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.99%
Hennessy Japan Fund - Institutional Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.72%
Hennessy Japan Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.74%
Hennessy Japan Fund - Institutional Class | Other Assets in Excess of Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.71%
Hennessy Japan Small Cap Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.97%
Hennessy Japan Small Cap Fund - Investor Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.87%
Hennessy Japan Small Cap Fund - Investor Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.92%
Hennessy Japan Small Cap Fund - Investor Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.61%
Hennessy Japan Small Cap Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.81%
Hennessy Japan Small Cap Fund - Investor Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.39%
Hennessy Japan Small Cap Fund - Investor Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.21%
Hennessy Japan Small Cap Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.14%
Hennessy Japan Small Cap Fund - Investor Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Hennessy Japan Small Cap Fund - Investor Class | Real Estate [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.48%
Hennessy Japan Small Cap Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Hennessy Japan Small Cap Fund - Investor Class | Utilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.52%
Hennessy Japan Small Cap Fund - Investor Class | Other Assets in Excess of Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.68%
Hennessy Japan Small Cap Fund - Institutional Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.97%
Hennessy Japan Small Cap Fund - Institutional Class | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.87%
Hennessy Japan Small Cap Fund - Institutional Class | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.92%
Hennessy Japan Small Cap Fund - Institutional Class | Energy [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.61%
Hennessy Japan Small Cap Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.81%
Hennessy Japan Small Cap Fund - Institutional Class | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.39%
Hennessy Japan Small Cap Fund - Institutional Class | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.21%
Hennessy Japan Small Cap Fund - Institutional Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.14%
Hennessy Japan Small Cap Fund - Institutional Class | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Hennessy Japan Small Cap Fund - Institutional Class | Real Estate [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.48%
Hennessy Japan Small Cap Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Hennessy Japan Small Cap Fund - Institutional Class | Utilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.52%
Hennessy Japan Small Cap Fund - Institutional Class | Other Assets in Excess of Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.68%
Hennessy Large Cap Financial Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.16%
Hennessy Large Cap Financial Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.94%
Hennessy Large Cap Financial Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.10%)
Hennessy Large Cap Financial Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.16%
Hennessy Large Cap Financial Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.94%
Hennessy Large Cap Financial Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.10%)
Hennessy Small Cap Financial Fund - Investor Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	97.87%
Hennessy Small Cap Financial Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.25%
Hennessy Small Cap Financial Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.12%)
Hennessy Small Cap Financial Fund - Institutional Class | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	97.87%
Hennessy Small Cap Financial Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.25%
Hennessy Small Cap Financial Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.12%)
Hennessy Technology Fund - Investor Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.28%
Hennessy Technology Fund - Investor Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	88.96%
Hennessy Technology Fund - Investor Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.92%
Hennessy Technology Fund - Investor Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.16%)
Hennessy Technology Fund - Institutional Class | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.28%
Hennessy Technology Fund - Institutional Class | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	88.96%
Hennessy Technology Fund - Institutional Class | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.92%
Hennessy Technology Fund - Institutional Class | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.16%)
Hennessy Stance ESG ETF | Communication Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.50%
Hennessy Stance ESG ETF | Consumer Discretionary [Member]
Holdings [Line Items]
Percent of Net Asset Value	20.05%
Hennessy Stance ESG ETF | Consumer Staples [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.31%
Hennessy Stance ESG ETF | Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.98%
Hennessy Stance ESG ETF | Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.89%
Hennessy Stance ESG ETF | Industrials [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.98%
Hennessy Stance ESG ETF | Information Technology [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.43%
Hennessy Stance ESG ETF | Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.54%
Hennessy Stance ESG ETF | Short-Term Investments and Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.35%
Hennessy Stance ESG ETF | Utilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.95%
Hennessy Stance ESG ETF | Other Assets in Excess of Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.02%