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N-2 - USD ($) | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
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Apr. 30, 2024 | Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2014 | Oct. 31, 2013
Cover [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Central Index Key |  | 0001285650 |  |  |  |  |  |  |  |  |  |  |
Amendment Flag |  | false |  |  |  |  |  |  |  |  |  |  |
Document Type |  | N-CSRS |  |  |  |  |  |  |  |  |  |  |
Entity Registrant Name |  | Calamos Global Total Return Fund |  |  |  |  |  |  |  |  |  |  |
Document Period End Date |  | Apr. 30, 2024 |  |  |  |  |  |  |  |  |  |  |
Financial Highlights [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Securities Amount |  | $ 108,165,000 | $ 89,579,000 | $ 94,186,000 | $ 148,697,000 | $ 106,882,000 | $ 100,526,000 | $ 100,722,000 | $ 113,638,000 | $ 103,158,000 | $ 112,474,000 | $ 120,277,000 |
Senior Securities Coverage per Unit | [1] | $ 4,644 | $ 4,541 | $ 5,276 | $ 4,281 | $ 4,213 | $ 3,938 | $ 3,621 | $ 4,490 | $ 3,456 | $ 3,556 | $ 3,455 |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price |  | 9.96 | 8.15 | 9.12 | 15.86 | 11.63 | 12.12 | 11.5 | 13.98 | 10.96 | 11.96 | 13.57 |
NAV Per Share |  | $ 11.01 | $ 9.12 | $ 9.59 | $ 15.82 | $ 11.99 | $ 11.6 | $ 11.65 | $ 13.4 | $ 12.19 | $ 13.29 | $ 14.21 | $ 14.56
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Debt [Table Text Block] |  | Note 7 – Notes Payable The Funds have each entered into an Amended and Restated Liquidity Agreement (the "SSB Agreement") with State Street Bank and Trust Company ("SSB") that allows each Fund to borrow up to a certain limit as shown in the table below, as well as engage in securities lending and securities repurchase transactions.
FUND |  | BORROWING LIMIT (IN MILLIONS) |
Convertible Opportunities and Income Fund |  | $ | 430.0 |  |
Convertible and High Income Fund |  |  | 480.0 |  |
Strategic Total Return Fund |  |  | 1,130.0 |  |
Dynamic Convertible and Income Fund |  |  | 370.0 |  |
Global Dynamic Income Fund |  |  | 265.0 |  |
Global Total Return Fund |  |  | 55.0 |  |
Long/Short Equity & Dynamic Income Trust |  |  | 150.0 |  |
Advances under the SSB Agreement are secured by assets of the Funds that are held with the Funds' custodian in a separate account (the "pledged collateral"). Interest on the SSB Agreement was charged on the drawn amount at the rate of OBFR plus 0.52%. A commitment fee of 0.10% is payable on any undrawn balance. For the period ended April 30, 2024, the Funds borrowed according to the table below:
FUND |  | AVERAGE BORROWINGS (IN MILLIONS) |  | AVERAGE INTEREST RATE |  | TOTAL OUTSTANDING BORROWINGS (IN MILLIONS) |  | INTEREST RATE APPLICABLE TO BORROWINGS |
Convertible Opportunities and Income Fund |  | $ | 314.4 |  |  |  | 5.94 | % |  | $ | 314.4 |  |  |  | 5.84 | % |
Convertible and High Income Fund |  |  | 340.4 |  |  |  | 5.94 | % |  |  | 340.4 |  |  |  | 5.84 | % |
Strategic Total Return Fund |  |  | 819.3 |  |  |  | 5.94 | % |  |  | 860.5 |  |  |  | 5.84 | % |
Dynamic Convertible and Income Fund |  |  | 210.0 |  |  |  | 5.94 | % |  |  | 210.0 |  |  |  | 5.84 | % |
Global Dynamic Income Fund |  |  | 135.7 |  |  |  | 5.94 | % |  |  | 147.1 |  |  |  | 5.84 | % |
Global Total Return Fund |  |  | 31.4 |  |  |  | 5.94 | % |  |  | 34.4 |  |  |  | 5.84 | % |
Long/Short Equity & Dynamic Income Trust |  |  | 120.0 |  |  |  | 5.94 | % |  |  | 120.0 |  |  |  | 5.84 | % |
Under the terms of the SSB Agreement, all securities lent through SSB must be secured continuously by collateral received in cash. Cash collateral received by SSB on behalf of the Fund is deposited by SSB in a custodial account of the Fund and then applied to repay borrowings under the SSB Agreement, such that the cash advanced to the Fund remains unchanged. Upon termination of a securities loan, SSB will advance to the Fund the cash collateral required to be returned by the Fund, or secure the appropriate amount through one or more securities lending transactions as the Fund's agent, and deposit the amount to a custodial account of the Fund and then subsequently return such amount to the securities borrower against return of the securities on loan. Again, the net cash to the Fund is unaltered. Only the composition of the advance is changed, and regardless of the composition of advances as between cash collateral for securities lending transactions or borrowings from SSB, they are not reflected separately in the Statement of Assets and Liabilities but as a component of the Notes Payable. The Fund has the right to recall securities which have been lent at any time. The securities lending arrangement with SSB involves characteristics common in arm's length relationships in which one party may benefit at the expense of the other party. As of April 30, 2024, the Funds had securities on loan under the SSB Agreement which are reflected in the Investment in securities, at value on the Statement of Assets and Liabilities and are shown in the table below. The borrowings are categorized as Level 2 within the fair value hierarchy. The composition of the securities on loan was as follows:
FUND |  | SECURITIES ON LOAN (IN MIILIONS) |  | FIXED INCOME SECURITIES (IN MILLIONS) |  | EQUITY SECURITIES (IN MILLIONS) |
Convertible Opportunities and Income Fund |  | $ | 52.8 |  |  | $ | 45.4 |  |  | $ | 7.4 |  |
Convertible and High Income Fund |  |  | 52.2 |  |  |  | 44.3 |  |  |  | 7.9 |  |
Strategic Total Return Fund |  |  | 773.6 |  |  |  | 13.3 |  |  |  | 760.3 |  |
Dynamic Convertible and Income Fund |  |  | 24.8 |  |  |  | 19.1 |  |  |  | 5.7 |  |
Global Dynamic Income Fund |  |  | 20.7 |  |  |  | 6.3 |  |  |  | 14.4 |  |
Global Total Return Fund |  |  | 17.7 |  |  |  | 2.8 |  |  |  | 14.9 |  |
Long/Short Equity & Dynamic Income Trust |  |  | 0.8 |  |  |  | 0.7 |  |  |  | 0.1 |  |
Long Term Debt, Structuring [Text Block] |  | The Funds have each entered into an Amended and Restated Liquidity Agreement (the "SSB Agreement") with State Street Bank and Trust Company ("SSB") that allows each Fund to borrow up to a certain limit as shown in the table below, as well as engage in securities lending and securities repurchase transactions.
FUND |  | BORROWING LIMIT (IN MILLIONS) |
Convertible Opportunities and Income Fund |  | $ | 430.0 |  |
Convertible and High Income Fund |  |  | 480.0 |  |
Strategic Total Return Fund |  |  | 1,130.0 |  |
Dynamic Convertible and Income Fund |  |  | 370.0 |  |
Global Dynamic Income Fund |  |  | 265.0 |  |
Global Total Return Fund |  |  | 55.0 |  |
Long/Short Equity & Dynamic Income Trust |  |  | 150.0 |  |
Advances under the SSB Agreement are secured by assets of the Funds that are held with the Funds' custodian in a separate account (the "pledged collateral"). Interest on the SSB Agreement was charged on the drawn amount at the rate of OBFR plus 0.52%. A commitment fee of 0.10% is payable on any undrawn balance. For the period ended April 30, 2024, the Funds borrowed according to the table below:
FUND |  | AVERAGE BORROWINGS (IN MILLIONS) |  | AVERAGE INTEREST RATE |  | TOTAL OUTSTANDING BORROWINGS (IN MILLIONS) |  | INTEREST RATE APPLICABLE TO BORROWINGS |
Convertible Opportunities and Income Fund |  | $ | 314.4 |  |  |  | 5.94 | % |  | $ | 314.4 |  |  |  | 5.84 | % |
Convertible and High Income Fund |  |  | 340.4 |  |  |  | 5.94 | % |  |  | 340.4 |  |  |  | 5.84 | % |
Strategic Total Return Fund |  |  | 819.3 |  |  |  | 5.94 | % |  |  | 860.5 |  |  |  | 5.84 | % |
Dynamic Convertible and Income Fund |  |  | 210.0 |  |  |  | 5.94 | % |  |  | 210.0 |  |  |  | 5.84 | % |
Global Dynamic Income Fund |  |  | 135.7 |  |  |  | 5.94 | % |  |  | 147.1 |  |  |  | 5.84 | % |
Global Total Return Fund |  |  | 31.4 |  |  |  | 5.94 | % |  |  | 34.4 |  |  |  | 5.84 | % |
Long/Short Equity & Dynamic Income Trust |  |  | 120.0 |  |  |  | 5.94 | % |  |  | 120.0 |  |  |  | 5.84 | % |
Long Term Debt, Dividends and Covenants [Text Block] |  | Under the terms of the SSB Agreement, all securities lent through SSB must be secured continuously by collateral received in cash. Cash collateral received by SSB on behalf of the Fund is deposited by SSB in a custodial account of the Fund and then applied to repay borrowings under the SSB Agreement, such that the cash advanced to the Fund remains unchanged. Upon termination of a securities loan, SSB will advance to the Fund the cash collateral required to be returned by the Fund, or secure the appropriate amount through one or more securities lending transactions as the Fund's agent, and deposit the amount to a custodial account of the Fund and then subsequently return such amount to the securities borrower against return of the securities on loan. Again, the net cash to the Fund is unaltered. Only the composition of the advance is changed, and regardless of the composition of advances as between cash collateral for securities lending transactions or borrowings from SSB, they are not reflected separately in the Statement of Assets and Liabilities but as a component of the Notes Payable. The Fund has the right to recall securities which have been lent at any time. The securities lending arrangement with SSB involves characteristics common in arm's length relationships in which one party may benefit at the expense of the other party. As of April 30, 2024, the Funds had securities on loan under the SSB Agreement which are reflected in the Investment in securities, at value on the Statement of Assets and Liabilities and are shown in the table below. The borrowings are categorized as Level 2 within the fair value hierarchy. The composition of the securities on loan was as follows:
FUND |  | SECURITIES ON LOAN (IN MIILIONS) |  | FIXED INCOME SECURITIES (IN MILLIONS) |  | EQUITY SECURITIES (IN MILLIONS) |
Convertible Opportunities and Income Fund |  | $ | 52.8 |  |  | $ | 45.4 |  |  | $ | 7.4 |  |
Convertible and High Income Fund |  |  | 52.2 |  |  |  | 44.3 |  |  |  | 7.9 |  |
Strategic Total Return Fund |  |  | 773.6 |  |  |  | 13.3 |  |  |  | 760.3 |  |
Dynamic Convertible and Income Fund |  |  | 24.8 |  |  |  | 19.1 |  |  |  | 5.7 |  |
Global Dynamic Income Fund |  |  | 20.7 |  |  |  | 6.3 |  |  |  | 14.4 |  |
Global Total Return Fund |  |  | 17.7 |  |  |  | 2.8 |  |  |  | 14.9 |  |
Long/Short Equity & Dynamic Income Trust |  |  | 0.8 |  |  |  | 0.7 |  |  |  | 0.1 |  |
Outstanding Security, Held [Shares] |  | 9,825,838 | 9,825,838 | 9,823,566 |  |  |  |  |  |  |  |  |
Mandatory Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Highlights [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Securities Amount |  | $ 17,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Liquidating Preference |  | $ 25 |  |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock [Table Text Block] |  | Note 8 – Mandatory Redeemable Preferred Shares All Funds except Long/Short Equity & Dynamic Income Trust have MRPS issued and outstanding, each divided into four series with different mandatory redemption dates and dividend rates. The tables below summarize the key terms of each series of the MRPS at April 30, 2024. The MRPS are divided into four series with different mandatory redemption dates and dividend rates. The tables below summarizes the key terms of each Fund's series of the MRPS at April 30, 2024. CONVERTIBLE OPPORTUNITIES AND INCOME FUND
SERIES |  | ISSUE DATE |  | TERM REDEMPTION DATE |  | DIVIDEND RATE |  | SHARES (000'S) |  | LIQUIDATION PREFERENCE PER SHARE |  | AGGREGATE LIQUIDATION PREFERENCE |
Series B |  | 9/6/17 |  | 9/6/24 |  |  | 4.00 | % |  |  | 1,330 |  |  | $ | 25 |  |  | $ | 33,250,000 |  |
Series C |  | 9/6/17 |  | 9/6/27 |  |  | 4.24 | % |  |  | 1,340 |  |  | $ | 25 |  |  | $ | 33,500,000 |  |
Series D |  | 8/24/21 |  | 8/24/26 |  |  | 2.45 | % |  |  | 1,320 |  |  | $ | 25 |  |  | $ | 33,000,000 |  |
Series E |  | 3/8/22 |  | 5/24/27 |  |  | 2.68 | % |  |  | 1,330 |  |  | $ | 25 |  |  | $ | 33,250,000 |  |
Total |  | $ | 133,000,000 |  |
CONVERTIBLE AND HIGH INCOME FUND
SERIES |  | ISSUE DATE |  | TERM REDEMPTION DATE |  | DIVIDEND RATE |  | SHARES (000'S) |  | LIQUIDATION PREFERENCE PER SHARE |  | AGGREGATE LIQUIDATION PREFERENCE |
Series B |  | 9/6/17 |  | 9/6/24 |  |  | 4.00 | % |  |  | 1,460 |  |  | $ | 25 |  |  | $ | 36,500,000 |  |
Series C |  | 9/6/17 |  | 9/6/27 |  |  | 4.24 | % |  |  | 1,480 |  |  | $ | 25 |  |  | $ | 37,000,000 |  |
Series D |  | 8/24/21 |  | 8/24/26 |  |  | 2.45 | % |  |  | 1,400 |  |  | $ | 25 |  |  | $ | 35,000,000 |  |
Series E |  | 3/8/22 |  | 5/24/27 |  |  | 2.68 | % |  |  | 1,460 |  |  | $ | 25 |  |  | $ | 36,500,000 |  |
Total |  | $ | 145,000,000 |  |
STRATEGIC TOTAL RETURN FUND
SERIES |  | ISSUE DATE |  | TERM REDEMPTION DATE |  | DIVIDEND RATE |  | SHARES (000'S) |  | LIQUIDATION PREFERENCE PER SHARE |  | AGGREGATE LIQUIDATION PREFERENCE |
Series B |  | 9/6/17 |  | 9/6/24 |  |  | 4.00 | % |  |  | 3,220 |  |  | $ | 25 |  |  | $ | 80,500,000 |  |
Series C |  | 9/6/17 |  | 9/6/27 |  |  | 4.24 | % |  |  | 3,240 |  |  | $ | 25 |  |  | $ | 81,000,000 |  |
Series D |  | 8/24/21 |  | 8/24/26 |  |  | 2.45 | % |  |  | 2,480 |  |  | $ | 25 |  |  | $ | 62,000,000 |  |
Series F |  | 5/24/22 |  | 5/24/27 |  |  | 3.66 | % |  |  | 4,000 |  |  | $ | 25 |  |  | $ | 100,000,000 |  |
Total |  | $ | 323,500,000 |  |
DYNAMIC CONVERTIBLE AND INCOME FUND
SERIES |  | ISSUE DATE |  | TERM REDEMPTION DATE |  | DIVIDEND RATE |  | SHARES (000'S) |  | LIQUIDATION PREFERENCE PER SHARE |  | AGGREGATE LIQUIDATION PREFERENCE |
Series B |  | 9/6/17 |  | 9/6/24 |  |  | 4.00 | % |  |  | 850 |  |  | $ | 25 |  |  | $ | 21,250,000 |  |
Series C |  | 9/6/17 |  | 9/6/27 |  |  | 4.24 | % |  |  | 860 |  |  | $ | 25 |  |  | $ | 21,500,000 |  |
Series D |  | 8/24/21 |  | 8/24/26 |  |  | 2.45 | % |  |  | 1,120 |  |  | $ | 25 |  |  | $ | 28,000,000 |  |
Series E |  | 3/8/22 |  | 5/24/27 |  |  | 2.68 | % |  |  | 850 |  |  | $ | 25 |  |  | $ | 21,250,000 |  |
Total |  | $ | 92,000,000 |  |
GLOBAL DYNAMIC INCOME FUND
SERIES |  | ISSUE DATE |  | TERM REDEMPTION DATE |  | DIVIDEND RATE |  | SHARES (000'S) |  | LIQUIDATION PREFERENCE PER SHARE |  | AGGREGATE LIQUIDATION PREFERENCE |
Series B |  | 9/6/17 |  | 9/6/24 |  |  | 4.00 | % |  |  | 860 |  |  | $ | 25 |  |  | $ | 21,500,000 |  |
Series C |  | 9/6/17 |  | 9/6/27 |  |  | 4.24 | % |  |  | 880 |  |  | $ | 25 |  |  | $ | 22,000,000 |  |
Series D |  | 8/24/21 |  | 8/24/26 |  |  | 2.45 | % |  |  | 200 |  |  | $ | 25 |  |  | $ | 5,000,000 |  |
Series E |  | 3/8/22 |  | 5/24/27 |  |  | 2.68 | % |  |  | 860 |  |  | $ | 25 |  |  | $ | 21,500,000 |  |
Total |  | $ | 70,000,000 |  |
GLOBAL TOTAL RETURN FUND
SERIES |  | ISSUE DATE |  | TERM REDEMPTION DATE |  | DIVIDEND RATE |  | SHARES (000'S) |  | LIQUIDATION PREFERENCE PER SHARE |  | AGGREGATE LIQUIDATION PREFERENCE |
Series B |  | 9/6/17 |  | 9/6/24 |  |  | 4.00 | % |  |  | 160 |  |  | $ | 25 |  |  | $ | 4,000,000 |  |
Series C |  | 9/6/17 |  | 9/6/27 |  |  | 4.24 | % |  |  | 160 |  |  | $ | 25 |  |  | $ | 4,000,000 |  |
Series D |  | 8/24/21 |  | 8/24/26 |  |  | 2.45 | % |  |  | 200 |  |  | $ | 25 |  |  | $ | 5,000,000 |  |
Series E |  | 3/8/22 |  | 5/24/27 |  |  | 2.68 | % |  |  | 160 |  |  | $ | 25 |  |  | $ | 4,000,000 |  |
Total |  | $ | 17,000,000 |  |
Offering costs incurred by the Funds in connection with the MRPS issuance are aggregated with the outstanding liability and are being amortized to interest expense and amortization of offering costs on MRPS over the respective life of each series of MRPS and shown in the Statement of operations. The MRPS are not listed on any exchange or automated quotation system. The MRPS are considered debt of the issuer; therefore, the liquidation preference, which approximates fair value of the MRPS, is recorded as a liability in each Fund's Statement of Assets and Liabilities net of deferred offering costs. The MRPS are categorized as Level 2 within the fair value hierarchy. During the period ended April 30, 2024, all MRPS were rated `AA-' by Kroll Bond Rating Agency LLC ("KBRA"). If the ratings of the MRPS are downgraded, each Fund's dividend expense may increase, as described below. Holders of MRPS are entitled to receive monthly cumulative cash dividends payable on the first business day of each month. The MRPS currently are rated "AA-" by KBRA. If on the first day of a monthly dividend period the MRPS of any class are rated lower than "A" by KBRA, the dividend rate for such period shall be increased by 0.5%, 2.0% or 4.0% according to an agreed upon schedule. The MRPS' dividend rate is also subject to increase during periods when a Fund has not made timely payments to MRPS holders and/or the MRPS do not have a current credit rating, subject to various terms and conditions. Dividends accrued and paid to the shareholders of MRPS are included in "Interest expense and amortization of offering costs on Mandatory Redeemable Preferred Shares" with each Fund's Statement of Operations. With regard to the Series B and C MRPS, so long as any MRPS are outstanding, a Fund will not declare, pay or set apart for payment any dividend or other distribution (other than non-cash distributions) with respect to Fund shares ranking junior to or on parity with the MRPS, unless (1) the Fund has satisfied the MRPS Overcollateralization Test (as defined below) on at least one "valuation date" in the preceding 65 calendar days, (2) immediately after such transaction the Fund would satisfy the MRPS Asset Coverage Test (as defined below), (3) full cumulative dividends on the MRPS due on or prior to the date of the transaction have been declared and paid to the holders of MRPS and (4) the Fund has redeemed the full number of MRPS required to be redeemed by any provision for mandatory redemption or deposited sufficient monies with the Fund's paying agent for that purpose, subject to certain grace periods and exceptions. MRPS Asset Coverage Test: Asset coverage with respect to all outstanding senior securities and preferred shares, including the MRPS, determined in accordance with Section 18(h) of the 1940 Act, on the basis of values calculated as of a time within 48 hours (not including Sundays or holidays) next preceding the time of determination, must be greater than or equal to 225%. MRPS Overcollateralization Test: So long as Fitch or any other NSRSO, such as KBRA, is then rating any class of the outstanding MRPS pursuant to the request of the Fund, satisfaction of only those overcollateralization ratios applicable to closed-end fund issuers with the same rating(s) as the Fund's MRPS' then-current rating(s) issued by Fitch or such other NSRSO, such as KBRA, by application of the applicable rating agency guidelines. In accordance with that certain Statement of Preferences governing the Series D, E and F MRPS, for so long as any MRPS are outstanding, a Fund will not declare, pay or set apart for payment any dividend or other distribution (other than a dividend or distribution paid in shares of, or options, warrants or rights to subscribe for or purchase, Common Shares or other shares of beneficial interest, if any, ranking junior to the MRPS as to dividends or upon liquidation (collectively "non-cash distributions") with respect to Common Shares or any other shares of the Series or Fund ranking junior to or on a parity with the MRPS as to dividends or upon liquidation, or call for redemption, redeem, purchase or otherwise acquire for consideration any Common Shares or any other such junior shares (except by conversion into or exchange for shares of the Fund ranking junior to the MRPS as to dividends and upon liquidation) or any such parity shares (except by conversion into or exchange for shares of the Fund ranking junior to or on a parity with the MRPS as to dividends and upon liquidation), unless (1) immediately after such transaction the Fund would satisfy the MRPS Asset Coverage Test, (2) full cumulative dividends on the MRPS due on or prior to the date of the transaction have been declared and paid to the Holders of MRPS, and (3) the Fund has redeemed the full number of MRPS required to be redeemed by any provision for mandatory redemption contained in Section 3(a) or deposited sufficient monies with the Paying Agent for that purpose (without regard to the provisions of the Special Proviso); provided that the Fund may make any distributions reasonably necessary for the Fund to continue to qualify as a "regulated investment company" under Subchapter M of the Internal Revenue Code and to avoid excise tax under Section 4982 of the Internal Revenue Code ("Tax Required Payments"). For the avoidance of doubt, any such Tax Required Payments would only be paid to holders of Common Shares after full cumulative dividends due on or prior to the date of the applicable distribution and any mandatory redemptions occurring on or prior to the date of the applicable distribution have been paid to the holders of MRPS. Except as otherwise required pursuant to the Funds' governing documents or applicable law, the holders of the MRPS have one vote per share and vote together with the holders of common stock of the Funds as a single class except on matters affecting only the holders of MRPS or the holders of common stock. Pursuant to the 1940 Act, holders of the MRPS have the right to elect at least two trustees of a Fund, voting separately as a class. Except during any time when a Fund has failed to make a dividend or redemption payment in respect of MRPS outstanding, the holders of MRPS have agreed to vote in accordance with the recommendation of the Board on any matter submitted to them for their vote or to the vote of shareholders of a Fund generally. |  |  |  |  |  |  |  |  |  |  |
Security Dividends [Text Block] |  | Holders of MRPS are entitled to receive monthly cumulative cash dividends payable on the first business day of each month. The MRPS currently are rated "AA-" by KBRA. If on the first day of a monthly dividend period the MRPS of any class are rated lower than "A" by KBRA, the dividend rate for such period shall be increased by 0.5%, 2.0% or 4.0% according to an agreed upon schedule. The MRPS' dividend rate is also subject to increase during periods when a Fund has not made timely payments to MRPS holders and/or the MRPS do not have a current credit rating, subject to various terms and conditions. Dividends accrued and paid to the shareholders of MRPS are included in "Interest expense and amortization of offering costs on Mandatory Redeemable Preferred Shares" with each Fund's Statement of Operations. |  |  |  |  |  |  |  |  |  |  |
Security Voting Rights [Text Block] |  | Except as otherwise required pursuant to the Funds' governing documents or applicable law, the holders of the MRPS have one vote per share and vote together with the holders of common stock of the Funds as a single class except on matters affecting only the holders of MRPS or the holders of common stock. Pursuant to the 1940 Act, holders of the MRPS have the right to elect at least two trustees of a Fund, voting separately as a class. Except during any time when a Fund has failed to make a dividend or redemption payment in respect of MRPS outstanding, the holders of MRPS have agreed to vote in accordance with the recommendation of the Board on any matter submitted to them for their vote or to the vote of shareholders of a Fund generally. |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Restrictions, Other [Text Block] |  | With regard to the Series B and C MRPS, so long as any MRPS are outstanding, a Fund will not declare, pay or set apart for payment any dividend or other distribution (other than non-cash distributions) with respect to Fund shares ranking junior to or on parity with the MRPS, unless (1) the Fund has satisfied the MRPS Overcollateralization Test (as defined below) on at least one "valuation date" in the preceding 65 calendar days, (2) immediately after such transaction the Fund would satisfy the MRPS Asset Coverage Test (as defined below), (3) full cumulative dividends on the MRPS due on or prior to the date of the transaction have been declared and paid to the holders of MRPS and (4) the Fund has redeemed the full number of MRPS required to be redeemed by any provision for mandatory redemption or deposited sufficient monies with the Fund's paying agent for that purpose, subject to certain grace periods and exceptions. |  |  |  |  |  |  |  |  |  |  |
Outstanding Securities [Table Text Block] |  | GLOBAL TOTAL RETURN FUND
SERIES |  | ISSUE DATE |  | TERM REDEMPTION DATE |  | DIVIDEND RATE |  | SHARES (000'S) |  | LIQUIDATION PREFERENCE PER SHARE |  | AGGREGATE LIQUIDATION PREFERENCE |
Series B |  | 9/6/17 |  | 9/6/24 |  |  | 4.00 | % |  |  | 160 |  |  | $ | 25 |  |  | $ | 4,000,000 |  |
Series C |  | 9/6/17 |  | 9/6/27 |  |  | 4.24 | % |  |  | 160 |  |  | $ | 25 |  |  | $ | 4,000,000 |  |
Series D |  | 8/24/21 |  | 8/24/26 |  |  | 2.45 | % |  |  | 200 |  |  | $ | 25 |  |  | $ | 5,000,000 |  |
Series E |  | 3/8/22 |  | 5/24/27 |  |  | 2.68 | % |  |  | 160 |  |  | $ | 25 |  |  | $ | 4,000,000 |  |
Total |  | $ | 17,000,000 |  |
Mandatory Redeemable Preferred Shares Series B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Highlights [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Securities Amount |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Liquidating Preference |  | $ 25 |  |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Security, Title [Text Block] |  | Series B |  |  |  |  |  |  |  |  |  |  |
Outstanding Security, Held [Shares] |  | 160,000 |  |  |  |  |  |  |  |  |  |  |
Mandatory Redeemable Preferred Shares Series C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Highlights [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Securities Amount |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Liquidating Preference |  | $ 25 |  |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Security, Title [Text Block] |  | Series C |  |  |  |  |  |  |  |  |  |  |
Outstanding Security, Held [Shares] |  | 160,000 |  |  |  |  |  |  |  |  |  |  |
Mandatory Redeemable Preferred Shares Series D [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Highlights [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Securities Amount |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Liquidating Preference |  | $ 25 |  |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Security, Title [Text Block] |  | Series D |  |  |  |  |  |  |  |  |  |  |
Outstanding Security, Held [Shares] |  | 200,000 |  |  |  |  |  |  |  |  |  |  |
Mandatory Redeemable Preferred Shares Series E [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Highlights [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Securities Amount |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Liquidating Preference |  | $ 25 |  |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Security, Title [Text Block] |  | Series E |  |  |  |  |  |  |  |  |  |  |
Outstanding Security, Held [Shares] |  | 160,000 |  |  |  |  |  |  |  |  |  |  |
Common Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
NAV Per Share |  | $ 11.01 |  |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock [Table Text Block] |  | Note 9 – Common Shares Each Fund has unlimited common shares of beneficial interest authorized at April 30, 2024. Transactions in common shares for each fund at April 30, 2024 were as follows:
CONVERTIBLE OPPORTUNITIES AND INCOME FUND |  | SIX MONTHS ENDED APRIL 30, 2024 |  | YEAR ENDED OCTOBER 31, 2023 |
Beginning shares |  |  | 74,818,167 |  |  |  | 74,081,296 |  |
Shares sold |  |  | — |  |  |  | — |  |
Shares issued through reinvestment of distributions |  |  | 419,858 |  |  |  | 736,871 |  |
Ending shares |  |  | 75,238,025 |  |  |  | 74,818,167 |  |
CONVERTIBLE AND HIGH INCOME FUND |  | SIX MONTHS ENDED APRIL 30, 2024 |  | YEAR ENDED OCTOBER 31, 2023 |
Beginning shares |  |  | 76,379,270 |  |  |  | 75,661,499 |  |
Shares sold |  |  | — |  |  |  | — |  |
Shares issued through reinvestment of distributions |  |  | 383,304 |  |  |  | 717,771 |  |
Ending shares |  |  | 76,762,574 |  |  |  | 76,379,270 |  |
STRATEGIC TOTAL RETURN FUND |  | SIX MONTHS ENDED APRIL 30, 2024 |  | YEAR ENDED OCTOBER 31, 2023 |
Beginning shares |  |  | 160,335,126 |  |  |  | 158,887,622 |  |
Shares sold |  |  | — |  |  |  | 702,814 |  |
Shares issued through reinvestment of distributions |  |  | 34,509 |  |  |  | 744,690 |  |
Ending shares |  |  | 160,369,635 |  |  |  | 160,335,126 |  |
DYNAMIC CONVERTIBLE AND INCOME FUND |  | SIX MONTHS ENDED APRIL 30, 2024 |  | YEAR ENDED OCTOBER 31, 2023 |
Beginning shares |  |  | 26,644,318 |  |  |  | 26,080,838 |  |
Shares sold |  |  | — |  |  |  | 206,742 |  |
Shares issued through reinvestment of distributions |  |  | 128,264 |  |  |  | 356,738 |  |
Ending shares |  |  | 26,772,582 |  |  |  | 26,644,318 |  |
GLOBAL DYNAMIC INCOME FUND |  | SIX MONTHS ENDED APRIL 30, 2024 |  | YEAR ENDED OCTOBER 31, 2023 |
Beginning shares |  |  | 63,864,387 |  |  |  | 63,864,387 |  |
Shares sold |  |  | — |  |  |  | — |  |
Shares issued through reinvestment of distributions |  |  | — |  |  |  | — |  |
Ending shares |  |  | 63,864,387 |  |  |  | 63,864,387 |  |
GLOBAL TOTAL RETURN FUND |  | SIX MONTHS ENDED APRIL 30, 2024 |  | YEAR ENDED OCTOBER 31, 2023 |
Beginning shares |  |  | 9,825,838 |  |  |  | 9,823,566 |  |
Shares sold |  |  | — |  |  |  | — |  |
Shares issued through reinvestment of distributions |  |  | — |  |  |  | 2,272 |  |
Ending shares |  |  | 9,825,838 |  |  |  | 9,825,838 |  |
LONG/SHORT EQUITY & DYNAMIC INCOME TRUST |  | SIX MONTHS ENDED APRIL 30, 2024 |  | YEAR ENDED OCTOBER 31, 2023 |
Beginning shares |  |  | 19,632,194 |  |  |  | 19,632,194 |  |
Shares sold |  |  | — |  |  |  | — |  |
Shares issued through reinvestment of distributions |  |  | — |  |  |  | — |  |
Ending shares |  |  | 19,632,194 |  |  |  | 19,632,194 |  |
Notice is hereby given in accordance with Section 23(c) of the 1940 Act that each Fund may from time to time purchase its shares of common stock in the open market. The Funds also may offer and sell common shares from time to time at an offering price equal to or in excess of the net asset value per share of each Fund's common shares at the time such common shares are initially sold. |  |  |  |  |  |  |  |  |  |  |
Security Preemptive and Other Rights [Text Block] |  | Notice is hereby given in accordance with Section 23(c) of the 1940 Act that each Fund may from time to time purchase its shares of common stock in the open market. The Funds also may offer and sell common shares from time to time at an offering price equal to or in excess of the net asset value per share of each Fund's common shares at the time such common shares are initially sold. |  |  |  |  |  |  |  |  |  |  |
Outstanding Securities [Table Text Block] |  |
GLOBAL TOTAL RETURN FUND |  | SIX MONTHS ENDED APRIL 30, 2024 |  | YEAR ENDED OCTOBER 31, 2023 |
Beginning shares |  |  | 9,825,838 |  |  |  | 9,823,566 |  |
Shares sold |  |  | — |  |  |  | — |  |
Shares issued through reinvestment of distributions |  |  | — |  |  |  | 2,272 |  |
Ending shares |  |  | 9,825,838 |  |  |  | 9,825,838 |  |
Outstanding Security, Held [Shares] |  | 9,825,838 |  |  |  |  |  |  |  |  |  |  |
[1] | Calculated by subtracting the Fund's total liabilities (not including Notes payable and Mandatory Redeemable Preferred Shares) from the Fund's total assets and dividing this by the amount of Notes payable outstanding, and by multiplying the result by 1,000.

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