Gabelli Capital Series Funds N-CSRS6 Sep 24Certified semi-annual shareholder report (management investment company)Financial data

Company Profile

Form N-CSR Cover

Form N-CSR Cover	6 Months Ended
Form N-CSR Cover	Jun. 30, 2024
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	GABELLI CAPITAL SERIES FUNDS INC
Entity Central Index Key	0000901246
Entity Investment Company Type	N-1A
Document Period End Date	Jun. 30, 2024

Shareholder Report

Shareholder Report	6 Months Ended
Shareholder Report	Jun. 30, 2024 USD ($) Holding
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	GABELLI CAPITAL SERIES FUNDS INC
Entity Central Index Key	0000901246
Entity Investment Company Type	N-1A
Document Period End Date	Jun. 30, 2024
C000002849
Shareholder Report [Line Items]
Fund Name	Gabelli Capital Asset Fund
Class Name	Single Share Class
Trading Symbol	Annuity
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about the Gabelli Capital Asset Fund (the Fund) for the period of January 1, 2024 to June 30, 2024.
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at www.gabelli.com
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com</span>" id="sjs-B19"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify;">www.gabelli.com</span>
Expenses [Text Block]	What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10k Investment Costs Paid as a % of a $10k Investment Gabelli Capital Asset Fund - Single Share Class $68 1.35%
Expenses Paid, Amount	$ 68
Expense Ratio, Percent	1.35%
Factors Affecting Performance [Text Block]	How did the Fund perform? During the six months ended June 30, 2024, the Gabelli Capital Asset Fund underperformed its broad-based benchmark, the S&P 500 Index and its comparative benchmark, the Russell 3000 Index. Like other value portfolios, the Fund lagged its benchmarks, as it did not hold large positions in the “Magnificent Seven.” Uncertainty regarding interest rate cuts eased in the second quarter as the Federal Reserve appeared to be pivoting towards an easing of rates later this year. Robust and continuing deal activity featuring large transactions was a positive driver, while uncertainty regarding the elections and the direction of the economy and inflation detracted from performance.
Line Graph [Table Text Block]	Gabelli Capital Asset Fund - Single Share Class S&P 500 Index Russell 3000 Index 6/14 10,000 10,000 10,000 6/15 9,865 10,742 10,729 6/16 9,374 11,171 10,959 6/17 10,889 13,170 12,987 6/18 12,121 15,063 14,907 6/19 12,559 16,632 16,245 6/20 10,453 17,881 17,306 6/21 15,936 25,175 24,948 6/22 13,488 22,501 21,488 6/23 15,309 26,910 25,560 6/24 16,489 33,519 31,472
Average Annual Return [Table Text Block]	Fund 6 months 1 Year 5 Year 10 Year Gabelli Capital Asset Fund - Single Share Class 2.54% 7.71% 5.60% 5.13% S&P 500 Index 15.29% 24.56% 15.05% 12.86% Russell 3000 Index 13.56% 23.13% 14.14% 12.15%
No Deduction of Taxes [Text Block]	The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
Performance Table Market Index Changed [Text Block]
Updated Performance Information Location [Text Block]	www.confluence.com/funds
AssetsNet	$ 60,089,991
Holdings Count \| Holding	111
Advisory Fees Paid, Amount	$ 231,246
InvestmentCompanyPortfolioTurnover	1%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $60,089,991 Number of Portfolio Holdings 111 Portfolio Turnover Rate 1% Management Fees $231,246
Holdings [Text Block]	Industry Allocation (% of net assets) Industry Weighting . Financials 12.9% Consumer Staples 8.7% Machinery 7.8% Materials 7.1% Information Technology 6.8% Media 6.8% Diversified Industrial 6.5% Entertainment 5.9% Other Industry sectors 37.6% Other Assets and Liabilities (Net) (0.1)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Top 10 HEICO Corp. 3.7% The Bank of New York Mellon Corp. 3.6% Texas Instruments Inc. 3.1% Paramount Global 3.0% Sony Group Corp. 3.0% AMETEK Inc. 2.9% ITT Inc. 2.9% Freeport-McMoRan Inc. 2.8% Diageo plc 2.7% United States Cellular Corp. 2.6%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B38"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify;">info@gabelli.com</span>
Updated Prospectus Web Address	www.gabelli.com</span>" id="sjs-B39"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify;">www.gabelli.com</span>

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)	6 Months Ended
Shareholder Report, Line Graph (Details) - USD ($)	Jun. 30, 2014	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
C000002849
Account Value [Line Items]
Line Graph and Table Measure Name	Gabelli Capital Asset Fund - Single Share Class
S&P 500 Index
Account Value [Line Items]
Account Value	$ 10,000	$ 33,519	$ 26,910	$ 22,501	$ 25,175	$ 17,881	$ 16,632	$ 15,063	$ 13,170	$ 11,171	$ 10,742
Russell 3000 Index
Account Value [Line Items]
Account Value	$ 10,000	$ 31,472	$ 25,560	$ 21,488	$ 24,948	$ 17,306	$ 16,245	$ 14,907	$ 12,987	$ 10,959	$ 10,729

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)	6 Months Ended		12 Months Ended	60 Months Ended	120 Months Ended
Shareholder Report, Average Annual Return (Details)	Jun. 30, 2024	Jun. 30, 2014	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2024
C000002849
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Gabelli Capital Asset Fund - Single Share Class
Without Sales Load [Member] \| C000002849
Average Annual Return [Line Items]
Average Annual Return, Percent	2.54%		7.71%	5.60%	5.13%
S&P 500 Index
Average Annual Return [Line Items]
Average Annual Return, Percent	15.29%		24.56%	15.05%	12.86%
Russell 3000 Index
Average Annual Return [Line Items]
Average Annual Return, Percent	13.56%		23.13%	14.14%	12.15%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details) - C000002849	Jun. 30, 2024
HEICO Corp.
Holdings [Line Items]
Percent of Net Asset Value	3.70%
The Bank of New York Mellon Corp.
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Texas Instruments Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Paramount Global
Holdings [Line Items]
Percent of Net Asset Value	3%
Sony Group Corp.
Holdings [Line Items]
Percent of Net Asset Value	3%
AMETEK Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.90%
ITT Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Freeport-McMoRan Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Diageo plc
Holdings [Line Items]
Percent of Net Asset Value	2.70%
United States Cellular Corp.
Holdings [Line Items]
Percent of Net Asset Value	2.60%
InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	98.20%
InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	1.90%
InvestmentType_Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(0.10%)
Financials
Holdings [Line Items]
Percent of Net Asset Value	12.90%
Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Machinery
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Materials
Holdings [Line Items]
Percent of Net Asset Value	7.10%
Information Technology
Holdings [Line Items]
Percent of Net Asset Value	6.80%
Media
Holdings [Line Items]
Percent of Net Asset Value	6.80%
Diversified Industrial
Holdings [Line Items]
Percent of Net Asset Value	6.50%
Entertainment
Holdings [Line Items]
Percent of Net Asset Value	5.90%
Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	37.60%
Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(0.10%)