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N-2 - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2023
Oct. 31, 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
Cover [Abstract]                      
Entity Central Index Key 0001258623                    
Amendment Flag false                    
Document Type 424B3                    
Entity Registrant Name Eaton Vance Senior Floating-Rate Trust                    
Financial Highlights [Abstract]                      
Senior Securities [Table Text Block]
   Year Ended October 31, 
   2024   2023   2022   2021   2020 
Net asset value - Beginning of year (Common shares)  $12.77   $12.28   $14.30   $13.50   $14.51 
Income (Loss) From Operations                         
Net investment income(1)  $1.50   $1.45   $0.92   $0.72   $0.81 
Net realized and unrealized gain (loss)   0.27    0.44    (1.93)   0.91    (0.87)
Distributions to preferred shareholders
From net investment income(1)		   (0.22)   (0.20)   (0.05)   —    (0.03)
Total income (loss) from operations  $1.55   $1.69   $(1.06)  $1.63   $(0.09)
Less Distributions to Common Shareholders                         
From net investment income  $(1.38)  $(1.20)  $(0.88)  $(0.81)  $(0.92)
Tax return on capital   (0.03)   —    (0.10)   (0.05)   — 
Total distributions to common shareholders  $(1.41)  $(1.20)  $(0.98)  $(0.86)  $(0.92)
Premium from common shares sold through shelf offering(1)  $0.00(2)   $—   $0.02   $0.00(2)   $— 
Discount on tender offer(1)  $—   $—   $—   $0.03   $— 
Net asset value — End of year (Common shares)  $12.91   $12.77   $12.28   $14.30   $13.50 
Market value — End of year (Common shares)  $12.77   $11.64   $11.17   $14.90   $11.90 
Total Investment Return on Net Asset Value(3)   12.62%   15.09%   (7.26)%   12.69%   0.42%
Total Investment Return on Market Value(3)   22.31%   15.34%   (19.10)%   33.21%   (0.52)%
Ratios/Supplemental Data                         
Net assets applicable to common shares, end of year (000’s omitted)  $378,631   $372,481   $358,405   $403,589   $497,341 
Ratios (as a percentage of average daily net assets applicable to common shares): (4)(5)†                         
Expenses excluding interest and fees   1.29%   1.34%   1.37%   1.33%   1.32%
Interest and fee expense(6)   2.10%   1.95%   0.81%   0.46%   0.78%
Total expenses   3.39%   3.29%   2.18%   1.79%   2.10%
Net expenses   3.39%(7)   3.29%(7)   2.18%(7)   1.79%   2.10%
Net investment income   11.59%   11.37%   6.83%   5.05%   6.03%
Portfolio Turnover   28%   24%   12%   66%   30%
Senior Securities:                         
Total notes payable outstanding (in 000’s)  $133,000   $110,000   $133,000   $120,000   $223,000 
Asset coverage per $1,000 of notes payable(8)  $4,418   $5,076   $4,265   $4,995   $3,570 
Total preferred shares outstanding   3,032    3,032    3,032    3,032    3,032 
Asset coverage per preferred share(9)  $70,350   $75,134   $67,924   $76,531   $66,612 
Involuntary liquidation preference per preferred share(10)  $25,000   $25,000   $25,000   $25,000   $25,000 
Approximate market value per preferred share(10)  $25,000   $25,000   $25,000   $25,000   $25,000 
   Year Ended October 31, 
   2019   2018   2017   2016   2015 
Net asset value -  Beginning of year (Common shares)  $15.37   $15.21   $14.86   $14.35   $15.33 
Income (Loss) From Operations                         
Net investment income(1)  $0.99   $0.89   $0.89   $0.96   $0.94 
Net realized and unrealized gain (loss)   (0.80)   0.15    0.36    0.46    (0.97)
Distributions to preferred shareholders
From net investment income(1)		   (0.07)   (0.06)   (0.03)   (0.02)   (0.01)
Discount on redemption and repurchase of auction preferred shares(1)   —    0.04    —    0.05    — 
Total income (loss) from operations  $0.12   $1.02   $1.22   $1.45   $(0.04)
Less Distributions to Common Shareholders                         
From net investment income  $(0.98)  $(0.86)  $(0.87)  $(0.94)  $(0.94)
Total distributions to common shareholders  $(0.98)  $(0.86)  $(0.87)  $(0.94)  $(0.94)
Net asset value — End of year (Common shares)  $14.51   $15.37   $15.21   $14.86   $14.35 
Market value — End of year (Common shares)  $12.91   $13.43   $14.55   $14.15   $12.97 
Total Investment Return on Net Asset Value(3)   1.69%   7.25%(11)   8.54%   11.31%(12)   0.15%
Total Investment Return on Market Value(3)   3.55%   (2.04)%   9.04%   17.27%   (1.24)%
Ratios/Supplemental Data                         
Net assets applicable to common shares, end of year (000’s omitted)  $534,714   $566,490   $560,431   $547,620   $528,561 
Ratios (as a percentage of average daily net assets applicable to common shares):(4)(5)†                         
Expenses excluding interest and fees(13)   1.28%   1.31%   1.34%   1.38%   1.39%
Interest and fee expense(6)   1.40%   1.06%   0.75%   0.49%   0.42%
Total expenses   2.68%   2.37%   2.09%   1.87%   1.81%
Net investment income   6.64%   5.78%   5.93%   6.84%   6.27%
Portfolio Turnover   28%   32%   42%   35%   32%
Senior Securities:                         
Total notes payable outstanding (in 000’s)  $218,000   $222,000   $199,000   $198,000   $208,000 
Asset coverage per $1,000 of notes payable(8)  $3,801   $3,893   $4,298   $4,250   $4,172 
Total preferred shares outstanding   3,032    3,032    3,836    3,836    5,252 
Asset coverage per preferred share(9)  $70,501   $72,558   $72,511   $71,584   $63,946 
Involuntary liquidation preference per preferred share(10)  $25,000   $25,000   $25,000   $25,000   $25,000 
Approximate market value per preferred share(10)  $25,000   $25,000   $25,000   $25,000   $25,000 
(1) Computed using average shares outstanding.
(2) Amount is less than $0.005.
(3) Returns are historical and are calculated by determining the percentage change in net asset value or market value with all distributions reinvested. Distributions are assumed to be reinvested at prices obtained under the Trust’s dividend reinvestment plan.
(4) Total expenses do not reflect amounts reimbursed and/or waived by the adviser and certain of its affiliates, if applicable. Net expenses are net of all reductions and represent the net expenses paid by the Trust.
(5) Ratios do not reflect the effect of dividend payments to preferred shareholders.
(6) Interest and fee expense relates to the notes payable incurred to partially redeem the Trust’s APS.
(7) Includes a reduction by the investment adviser of a portion of its adviser fee due to the Trust’s investment in the Morgan Stanley Institutional Liquidity Funds – Government Portfolio (equal to less than 0.005% of average daily net assets for the years ended October 31, 2024, 2023 and 2022).
(8) Calculated by subtracting the Trust’s total liabilities (not including the notes payable and preferred shares) from the Trust’s total assets, and dividing the result by the notes payable balance in thousands.
(9) Calculated by subtracting the Trust’s total liabilities (not including the notes payable and preferred shares) from the Trust’s total assets, dividing the result by the sum of the value of the notes payable and liquidation value of preferred shares, and multiplying the result by the liquidation value of one preferred share. Such amount equates to 281%, 301%, 272%, 306%, 266%, 282%, 290%, 290%, 286% and 256% at October 31, 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016 and 2015, respectively.
(10) Plus accumulated and unpaid dividends.
(11) The total return based on net asset value reflects the impact of the tender and repurchase by the Trust of a portion of its APS at 92% of the per share liquidation preference. Absent this transaction, the total return based on net asset value would have been 6.94%.
(12) The total return based on net asset value reflects the impact of the tender and repurchase by the Trust of a portion of its APS at 95% of the per share liquidation preference. Absent this transaction, the total return based on net asset value would have been 10.95%.
(13) Excludes the effect of custody fee credits, if any, of less than 0.005%. Effective September 1, 2015, custody fee credits, which were earned on cash deposit balances, were discontinued by the custodian.
†  Ratios based on net assets applicable to common shares plus preferred shares and borrowings are presented below. Ratios do not reflect the effect of dividend payments to preferred shareholders and exclude the effect of custody fee credits, if any.
                    
Senior Securities Amount   $ 133,000 $ 110,000 $ 133,000 $ 120,000 $ 223,000 $ 218,000 $ 222,000 $ 199,000 $ 198,000 $ 208,000
Senior Securities Coverage per Unit [1]   $ 4,418 $ 5,076 $ 4,265 $ 4,995 $ 3,570 $ 3,801 $ 3,893 $ 4,298 $ 4,250 $ 4,172
Preferred Stock Liquidating Preference [2]   25,000 25,000 25,000 25,000 25,000 25,000 25,000 25,000 25,000 25,000
Senior Securities Average Market Value per Unit [2]   $ 25,000 $ 25,000 $ 25,000 $ 25,000 $ 25,000 $ 25,000 $ 25,000 $ 25,000 $ 25,000 $ 25,000
[1] Calculated by subtracting the Trust’s total liabilities (not including the notes payable and preferred shares) from the Trust’s total assets, and dividing the result by the notes payable balance in thousands.
[2] Plus accumulated and unpaid dividends.