N-2 - USD ($) $ / shares in Units, $ in Thousands |
6 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2026 |
Mar. 31, 2026 |
Sep. 30, 2023 |
Sep. 30, 2025 |
Sep. 30, 2024 |
Dec. 31, 2022 |
Dec. 31, 2021 |
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| Cover [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Entity Central Index Key | 0000845611 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amendment Flag | false | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Document Type | N-CSRS | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Entity Registrant Name | The Gabelli Convertible & Income Securities Fund Inc. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Objectives and Practices [Text Block] | Investment Objective (Unaudited)
The Gabelli Convertible and Income Securities Fund is a diversified, closed-end management investment company whose primary investment objective is to seek a high level of total return through a combination of current income and capital appreciation. |
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| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Capital Stock [Table Text Block] | 7. Capital. The charter permits the Fund to issue 998,000,000 shares of common stock (par value $0.001). The Board has authorized the repurchase of up to 500,000 shares of common stock on the open market when the shares are trading at a discount of 10% or more (or such other percentage as the Board may determine from time to time) from the NAV of the shares. During the six months ended March 31, 2026 and the fiscal year ended September 30, 2025, the Fund did not repurchase any shares of its common stock in the open market.
For the six months ended March 31, 2026 and the fiscal year ended September 30, 2025, transactions in common stock were as follows:
As of March 31, 2026, the Fund had an effective shelf registration available through September 30, 2027, which authorizes issuance of $125 million in common or preferred shares.
the common stock. Such leveraging tends to magnify both the risks and opportunities to common stockholders. Dividends on shares of the Preferred Stock are cumulative. The Fund is required by the 1940 Act and by the Fund’s Articles Supplementary to meet certain asset coverage tests with respect to the Preferred Stock. If the Fund fails to meet these requirements and does not correct such failure, the Fund may be required to redeem, in part or in full, the Series G Preferred at the redemption price of $10 per share plus an amount equal to the accumulated and unpaid dividends whether or not declared on such shares in order to meet these requirements. Additionally, failure to meet the foregoing asset coverage requirements could restrict the Fund’s ability to pay dividends to common stockholders and could lead to sales of portfolio securities at inopportune times. The income received on the Fund’s assets may vary in a manner unrelated to the fixed and variable rates, which could have either a beneficial or detrimental impact on net investment income and gains available to common stockholders.
On December 29, 2022, the Fund issued 1,500,000 shares of Series G 5.20% Cumulative Preferred Stock, receiving $14,898,306 after the deduction of offering expenses of $101,694. The Series G Preferred has a liquidation value of $10 per share and an annual dividend rate of 5.20%. On December 26, 2023, 860,000 shares of Series G Preferred were put back to the Fund at their liquidation preference of $10 per share. On June 26, 2025, the Fund redeemed all outstanding Series G Preferred at the liquidation preference of $10 per share.
On June 26, 2025, the Fund issued 607,500 shares of Series H 5.20% Cumulative Preferred Stock (Series H Preferred), receiving $6,075,000 after deduction of estimated offering expenses. The Series H Preferred has a liquidation value of $10 per share and an annual dividend rate of 5.20%. The Series H Preferred are subject to mandatory redemption on September 26, 2027. The Series H Preferred are not subject to optional redemption unless such redemption is necessary, in the judgment of the Board, to maintain the Fund’s status as a regulated investment company under Subchapter M of the Internal Revenue Code of 1986, as amended. The Fund will also redeem all or any part of the outstanding Series H Preferred that holders have properly tendered for redemption during each sixty day period prior to June 26, 2026, and March 26, 2027, at the liquidation preference, plus any accumulated and unpaid dividends.
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| Document Period End Date | Mar. 31, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cumulative Preferred Shares [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Security Voting Rights [Text Block] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Preferred Stock Restrictions, Other [Text Block] |
the common stock. Such leveraging tends to magnify both the risks and opportunities to common stockholders. Dividends on shares of the Preferred Stock are cumulative. The Fund is required by the 1940 Act and by the Fund’s Articles Supplementary to meet certain asset coverage tests with respect to the Preferred Stock. If the Fund fails to meet these requirements and does not correct such failure, the Fund may be required to redeem, in part or in full, the Series G Preferred at the redemption price of $10 per share plus an amount equal to the accumulated and unpaid dividends whether or not declared on such shares in order to meet these requirements. Additionally, failure to meet the foregoing asset coverage requirements could restrict the Fund’s ability to pay dividends to common stockholders and could lead to sales of portfolio securities at inopportune times. The income received on the Fund’s assets may vary in a manner unrelated to the fixed and variable rates, which could have either a beneficial or detrimental impact on net investment income and gains available to common stockholders.
On December 29, 2022, the Fund issued 1,500,000 shares of Series G 5.20% Cumulative Preferred Stock, receiving $14,898,306 after the deduction of offering expenses of $101,694. The Series G Preferred has a liquidation value of $10 per share and an annual dividend rate of 5.20%. On December 26, 2023, 860,000 shares of Series G Preferred were put back to the Fund at their liquidation preference of $10 per share. On June 26, 2025, the Fund redeemed all outstanding Series G Preferred at the liquidation preference of $10 per share.
On June 26, 2025, the Fund issued 607,500 shares of Series H 5.20% Cumulative Preferred Stock (Series H Preferred), receiving $6,075,000 after deduction of estimated offering expenses. The Series H Preferred has a liquidation value of $10 per share and an annual dividend rate of 5.20%. The Series H Preferred are subject to mandatory redemption on September 26, 2027. The Series H Preferred are not subject to optional redemption unless such redemption is necessary, in the judgment of the Board, to maintain the Fund’s status as a regulated investment company under Subchapter M of the Internal Revenue Code of 1986, as amended. The Fund will also redeem all or any part of the outstanding Series H Preferred that holders have properly tendered for redemption during each sixty day period prior to June 26, 2026, and March 26, 2027, at the liquidation preference, plus any accumulated and unpaid dividends.
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| Series G Cumulative Preferred Shares [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financial Highlights [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Securities Amount | $ 15,000 | $ 6,400 | $ 15,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Securities Coverage per Unit | $ 59.66 | $ 125.49 | $ 63.50 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Preferred Stock Liquidating Preference | 10.00 | 10.00 | 10.00 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Securities Average Market Value per Unit | [1],[2] | $ 10.00 | $ 10.00 | $ 10.00 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outstanding Security, Not Held [Shares] | 607,500 | 1,500,000 | 640,000 | 1,500,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Common Stock [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| NAV Per Share | $ 4.14 | $ 4.14 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outstanding Security, Not Held [Shares] | 20,147,486 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Series E Cumulative Preferred Shares [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financial Highlights [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Securities Amount | $ 33,760 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Securities Coverage per Unit | $ 453.99 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Preferred Stock Liquidating Preference | 100.00 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Securities Average Market Value per Unit | [1],[3] | $ 100.00 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outstanding Security, Not Held [Shares] | 338,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Series H Cumulative Preferred Shares [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financial Highlights [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Securities Amount | $ 6,075 | $ 6,075 | $ 6,075 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Securities Coverage per Unit | $ 147.32 | $ 147.32 | $ 153.32 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Preferred Stock Liquidating Preference | $ 10.00 | 10.00 | 10.00 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Securities Average Market Value per Unit | [1],[4] | $ 10.00 | $ 10.00 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outstanding Security, Not Held [Shares] | 608,000 | 608,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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