v3.25.1
Shareholder Report
 12 Months Ended
Feb. 28, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name EATON VANCE MUTUAL FUNDS TRUST
Entity Central Index Key 0000745463
Entity Investment Company Type N-1A
Document Period End Date Feb. 28, 2025
C000138166  
Shareholder Report [Line Items]  
Fund Name Parametric Dividend Income Fund
Class Name Class A
Trading Symbol EAPDX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Parametric Dividend Income Fund for the period of March 1, 2024 to February 28, 2025.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/parametric-fund-documents.php. You can also request this information by contacting us at 1-800-260-0761.
Additional Information Phone Number 1-800-260-0761
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/parametric-fund-documents.php</span>
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
Class A
$70
0.66%
Expenses Paid, Amount $ 70
Expense Ratio, Percent 0.66%
Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000® Value Index (the Index):

 

↓ Diversification at the sector level ― the Fund pursues an equal-sector representation ― detracted from performance relative to the Index during the period

↓ Security level diversification ― the Fund pursues an equal weighting across securities ranking highest on Parametric’s propriety score factor ― hurt returns

↓ An underweight allocation to the financials sector detracted from returns, as interest-rate cuts by the U.S. Federal Reserve helped push up bank stock prices

↓ Stock selections in the consumer discretionary sector ― particularly overweight positions in luxury and recreation stocks that fell in value ― hurt returns

↓ Stock selections in the communication services sector ― particularly overweight positions in poor-performing media and advertising firms ― hurt relative returns

↑ Stock selections in the health care sector ― especially overweight positions in medical suppliers, devices and diagnostics firms ― helped relative returns

↑ An overweight allocation to the utilities sector helped Index-relative performance as high demand for electricity to power data centers drove up utility prices

↑ An underweight allocation to health care ― the weakest-performing sector within the Index amid low pharmaceutical and insurance stock prices ― helped returns

 
Performance Past Does Not Indicate Future [Text] THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS.
Line Graph [Table Text Block]
Growth of 10K Chart
Class A with Maximum Sales Charge
S&P 500® Index
Russell 1000® Value Index
2/15
$10,000
$10,000
$10,000
3/15
$9,376
$9,842
$9,864
4/15
$9,411
$9,936
$9,956
5/15
$9,402
$10,064
$10,076
6/15
$9,213
$9,869
$9,875
7/15
$9,310
$10,076
$9,918
8/15
$8,896
$9,468
$9,327
9/15
$8,748
$9,234
$9,046
10/15
$9,394
$10,013
$9,728
11/15
$9,465
$10,042
$9,765
12/15
$9,169
$9,884
$9,555
1/16
$8,924
$9,394
$9,062
2/16
$9,142
$9,381
$9,059
3/16
$9,815
$10,017
$9,712
4/16
$9,970
$10,056
$9,916
5/16
$10,034
$10,237
$10,070
6/16
$10,255
$10,263
$10,157
7/16
$10,493
$10,642
$10,452
8/16
$10,466
$10,657
$10,532
9/16
$10,444
$10,659
$10,511
10/16
$10,232
$10,464
$10,348
11/16
$10,721
$10,852
$10,939
12/16
$10,942
$11,066
$11,212
1/17
$11,035
$11,276
$11,292
2/17
$11,333
$11,724
$11,698
3/17
$11,263
$11,738
$11,579
4/17
$11,301
$11,858
$11,557
5/17
$11,329
$12,025
$11,546
6/17
$11,425
$12,100
$11,734
7/17
$11,604
$12,349
$11,890
8/17
$11,510
$12,387
$11,752
9/17
$11,887
$12,642
$12,100
10/17
$12,039
$12,937
$12,188
11/17
$12,456
$13,334
$12,561
12/17
$12,634
$13,482
$12,744
1/18
$13,126
$14,254
$13,237
2/18
$12,451
$13,729
$12,605
3/18
$12,334
$13,380
$12,383
4/18
$12,508
$13,431
$12,424
5/18
$12,682
$13,755
$12,498
6/18
$12,752
$13,839
$12,529
7/18
$13,200
$14,354
$13,025
8/18
$13,345
$14,822
$13,217
9/18
$13,378
$14,906
$13,243
10/18
$12,542
$13,888
$12,558
11/18
$12,915
$14,171
$12,933
12/18
$11,671
$12,891
$11,691
1/19
$12,664
$13,924
$12,601
2/19
$13,050
$14,371
$13,003
3/19
$13,073
$14,650
$13,086
4/19
$13,349
$15,244
$13,550
5/19
$12,461
$14,275
$12,679
6/19
$13,314
$15,281
$13,589
7/19
$13,386
$15,501
$13,702
8/19
$12,921
$15,255
$13,299
9/19
$13,414
$15,540
$13,773
10/19
$13,476
$15,877
$13,966
11/19
$13,776
$16,453
$14,398
12/19
$14,196
$16,950
$14,794
1/20
$13,791
$16,943
$14,475
2/20
$12,428
$15,549
$13,074
3/20
$10,075
$13,628
$10,839
4/20
$11,547
$15,375
$12,058
5/20
$12,020
$16,107
$12,471
6/20
$12,049
$16,428
$12,388
7/20
$12,483
$17,354
$12,878
8/20
$12,779
$18,601
$13,411
9/20
$12,387
$17,895
$13,081
10/20
$12,398
$17,419
$12,909
11/20
$13,923
$19,326
$14,646
12/20
$14,354
$20,069
$15,207
1/21
$14,344
$19,866
$15,068
2/21
$15,181
$20,414
$15,979
3/21
$16,245
$21,308
$16,919
4/21
$16,710
$22,445
$17,595
5/21
$17,218
$22,602
$18,006
6/21
$17,044
$23,129
$17,800
7/21
$17,077
$23,679
$17,942
8/21
$17,240
$24,399
$18,298
9/21
$16,598
$23,264
$17,661
10/21
$17,375
$24,894
$18,558
11/21
$16,915
$24,721
$17,904
12/21
$18,095
$25,829
$19,033
1/22
$17,875
$24,493
$18,590
2/22
$17,875
$23,759
$18,374
3/22
$18,566
$24,642
$18,893
4/22
$17,901
$22,493
$17,827
5/22
$18,422
$22,534
$18,174
6/22
$16,927
$20,674
$16,586
7/22
$17,863
$22,580
$17,686
8/22
$17,417
$21,659
$17,159
9/22
$15,911
$19,665
$15,654
10/22
$17,583
$21,257
$17,259
11/22
$18,798
$22,445
$18,338
12/22
$18,101
$21,151
$17,599
1/23
$18,845
$22,480
$18,511
2/23
$18,134
$21,932
$17,858
3/23
$18,067
$22,737
$17,776
4/23
$18,101
$23,092
$18,044
5/23
$16,920
$23,192
$17,348
6/23
$17,999
$24,725
$18,500
7/23
$18,697
$25,519
$19,151
8/23
$18,216
$25,113
$18,634
9/23
$17,564
$23,916
$17,915
10/23
$17,160
$23,413
$17,282
11/23
$18,140
$25,551
$18,586
12/23
$18,972
$26,712
$19,616
1/24
$18,786
$27,161
$19,636
2/24
$19,007
$28,611
$20,361
3/24
$20,003
$29,531
$21,379
4/24
$19,287
$28,325
$20,465
5/24
$19,827
$29,730
$21,114
6/24
$19,586
$30,796
$20,916
7/24
$20,622
$31,171
$21,985
8/24
$20,964
$31,927
$22,575
9/24
$21,214
$32,609
$22,888
10/24
$20,834
$32,313
$22,636
11/24
$21,948
$34,210
$24,081
12/24
$20,528
$33,395
$22,434
1/25
$21,033
$34,325
$23,473
2/25
$21,116
$33,877
$23,568
Average Annual Return [Table Text Block]
Fund
1 Year
5 Years
10 Years
Class A
11.14%
11.18%
8.34%
Class A with 5.25% Maximum Sales Charge
5.33%
10.00%
7.75%
S&P 500® Index
18.41%
16.84%
12.97%
Russell 1000® Value Index
15.75%
12.50%
8.94%
AssetsNet $ 21,524,016
Holdings Count | Holding 191
Advisory Fees Paid, Amount $ 0
InvestmentCompanyPortfolioTurnover 53.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets
$21,524,016
# of Portfolio Holdings
191
Portfolio Turnover Rate
53%
Total Advisory Fees Paid (net of waiver)
$0
Holdings [Text Block]

Sector Allocation (% of total investments)

Group By Asset Type Chart
Value
Value
Short-Term Investments
0.4%
Communication Services
5.1%
Consumer Discretionary
9.9%
Information Technology
10.3%
Industrials
10.4%
Materials
10.4%
Energy
10.6%
Financials
10.6%
Utilities
10.6%
Consumer Staples
10.7%
Health Care
11.0%

Top Ten Holdings (% of total investments)Footnote Referencea

Royalty Pharma PLC, Class A
0.7%
National Fuel Gas Co.
0.7%
AT&T, Inc.
0.6%
Philip Morris International, Inc.
0.6%
American Electric Power Co., Inc.
0.6%
AbbVie, Inc.
0.6%
Fidelity National Financial, Inc.
0.6%
LKQ Corp.
0.6%
Gilead Sciences, Inc.
0.6%
Devon Energy Corp.
0.6%
Total
6.2%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-260-0761
C000138167  
Shareholder Report [Line Items]  
Fund Name Parametric Dividend Income Fund
Class Name Class I
Trading Symbol EIPDX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Parametric Dividend Income Fund for the period of March 1, 2024 to February 28, 2025.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/parametric-fund-documents.php. You can also request this information by contacting us at 1-800-260-0761.
Additional Information Phone Number 1-800-260-0761
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/parametric-fund-documents.php</span>
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
Class I
$43
0.41%
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.41%
Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000® Value Index (the Index):

 

↓ Diversification at the sector level ― the Fund pursues an equal-sector representation ― detracted from performance relative to the Index during the period

↓ Security level diversification ― the Fund pursues an equal weighting across securities ranking highest on Parametric’s propriety score factor ― hurt returns

↓ An underweight allocation to the financials sector detracted from returns, as interest-rate cuts by the U.S. Federal Reserve helped push up bank stock prices

↓ Stock selections in the consumer discretionary sector ― particularly overweight positions in luxury and recreation stocks that fell in value ― hurt returns

↓ Stock selections in the communication services sector ― particularly overweight positions in poor-performing media and advertising firms ― hurt relative returns

↑ Stock selections in the health care sector ― especially overweight positions in medical suppliers, devices and diagnostics firms ― helped relative returns

↑ An overweight allocation to the utilities sector helped Index-relative performance as high demand for electricity to power data centers drove up utility prices

↑ An underweight allocation to health care ― the weakest-performing sector within the Index amid low pharmaceutical and insurance stock prices ― helped returns

 
Performance Past Does Not Indicate Future [Text] THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS.
Line Graph [Table Text Block]
Growth of 10K Chart
Class I
S&P 500® Index
Russell 1000® Value Index
2/15
$1,000,000
$1,000,000
$1,000,000
3/15
$990,958
$984,186
$986,387
4/15
$993,724
$993,627
$995,609
5/15
$993,728
$1,006,404
$1,007,574
6/15
$973,425
$986,922
$987,456
7/15
$983,658
$1,007,600
$991,786
8/15
$939,916
$946,807
$932,718
9/15
$924,812
$923,380
$904,559
10/15
$993,211
$1,001,271
$972,811
11/15
$1,001,648
$1,004,248
$976,534
12/15
$970,830
$988,409
$955,533
1/16
$944,926
$939,360
$906,159
2/16
$967,951
$938,093
$905,930
3/16
$1,039,721
$1,001,732
$971,188
4/16
$1,056,138
$1,005,615
$991,590
5/16
$1,062,900
$1,023,674
$1,006,991
6/16
$1,085,888
$1,026,326
$1,015,699
7/16
$1,112,108
$1,064,166
$1,045,190
8/16
$1,109,191
$1,065,660
$1,053,249
9/16
$1,107,554
$1,065,861
$1,051,054
10/16
$1,085,067
$1,046,419
$1,034,787
11/16
$1,136,875
$1,085,173
$1,093,888
12/16
$1,160,379
$1,106,623
$1,121,227
1/17
$1,171,233
$1,127,611
$1,129,215
2/17
$1,202,808
$1,172,384
$1,169,792
3/17
$1,195,155
$1,173,752
$1,157,876
4/17
$1,200,111
$1,185,806
$1,155,703
5/17
$1,202,096
$1,202,494
$1,154,570
6/17
$1,213,875
$1,209,999
$1,173,444
7/17
$1,231,866
$1,234,880
$1,189,040
8/17
$1,222,874
$1,238,660
$1,175,189
9/17
$1,263,632
$1,264,211
$1,209,996
10/17
$1,279,737
$1,293,712
$1,218,781
11/17
$1,325,043
$1,333,390
$1,256,102
12/17
$1,343,601
$1,348,216
$1,274,438
1/18
$1,395,838
$1,425,406
$1,323,710
2/18
$1,324,159
$1,372,870
$1,260,501
3/18
$1,312,652
$1,337,981
$1,238,328
4/18
$1,332,190
$1,343,115
$1,242,416
5/18
$1,350,684
$1,375,459
$1,249,791
6/18
$1,357,827
$1,383,925
$1,252,886
7/18
$1,406,512
$1,435,426
$1,302,474
8/18
$1,420,973
$1,482,200
$1,321,725
9/18
$1,426,191
$1,490,637
$1,324,347
10/18
$1,337,258
$1,388,751
$1,255,770
11/18
$1,377,015
$1,417,052
$1,293,262
12/18
$1,244,470
$1,289,105
$1,169,076
1/19
$1,350,240
$1,392,409
$1,260,070
2/19
$1,391,254
$1,437,116
$1,300,332
3/19
$1,394,657
$1,465,042
$1,308,599
4/19
$1,425,088
$1,524,361
$1,355,016
5/19
$1,330,523
$1,427,491
$1,267,893
6/19
$1,421,175
$1,528,095
$1,358,908
7/19
$1,428,826
$1,550,057
$1,370,172
8/19
$1,380,423
$1,525,503
$1,329,882
9/19
$1,432,865
$1,554,046
$1,377,329
10/19
$1,439,474
$1,587,706
$1,396,581
11/19
$1,472,513
$1,645,338
$1,439,758
12/19
$1,517,262
$1,694,998
$1,479,364
1/20
$1,475,088
$1,694,333
$1,447,538
2/20
$1,328,586
$1,554,857
$1,307,350
3/20
$1,077,365
$1,362,812
$1,083,931
4/20
$1,234,641
$1,537,517
$1,205,788
5/20
$1,286,322
$1,610,745
$1,247,109
6/20
$1,290,175
$1,642,779
$1,238,831
7/20
$1,336,529
$1,735,407
$1,287,806
8/20
$1,368,184
$1,860,149
$1,341,057
9/20
$1,327,261
$1,789,469
$1,308,116
10/20
$1,327,266
$1,741,881
$1,290,924
11/20
$1,491,470
$1,932,554
$1,464,571
12/20
$1,537,407
$2,006,857
$1,520,722
1/21
$1,537,401
$1,986,596
$1,506,795
2/21
$1,627,085
$2,041,376
$1,597,855
3/21
$1,741,903
$2,130,780
$1,691,880
4/21
$1,791,667
$2,244,497
$1,759,540
5/21
$1,847,209
$2,260,173
$1,800,616
6/21
$1,828,606
$2,312,937
$1,779,996
7/21
$1,833,272
$2,367,880
$1,794,222
8/21
$1,850,754
$2,439,877
$1,829,804
9/21
$1,781,948
$2,326,399
$1,766,112
10/21
$1,866,411
$2,489,391
$1,855,791
11/21
$1,815,968
$2,472,142
$1,790,393
12/21
$1,943,782
$2,582,934
$1,903,342
1/22
$1,920,149
$2,449,274
$1,859,006
2/22
$1,921,331
$2,375,940
$1,837,433
3/22
$1,995,500
$2,464,157
$1,889,302
4/22
$1,924,190
$2,249,278
$1,782,739
5/22
$1,981,238
$2,253,405
$1,817,394
6/22
$1,820,876
$2,067,400
$1,658,605
7/22
$1,921,371
$2,258,024
$1,768,592
8/22
$1,873,516
$2,165,937
$1,715,895
9/22
$1,712,287
$1,966,457
$1,565,434
10/22
$1,892,024
$2,125,664
$1,725,938
11/22
$2,023,830
$2,244,455
$1,833,794
12/22
$1,948,725
$2,115,142
$1,759,871
1/23
$2,028,760
$2,248,045
$1,851,068
2/23
$1,953,575
$2,193,195
$1,785,801
3/23
$1,946,381
$2,273,716
$1,777,577
4/23
$1,951,265
$2,309,205
$1,804,360
5/23
$1,823,053
$2,319,243
$1,734,770
6/23
$1,940,357
$2,472,487
$1,850,005
7/23
$2,015,460
$2,551,916
$1,915,061
8/23
$1,964,981
$2,511,285
$1,863,361
9/23
$1,894,741
$2,391,553
$1,791,455
10/23
$1,851,312
$2,341,267
$1,728,248
11/23
$1,956,782
$2,555,084
$1,858,644
12/23
$2,047,474
$2,671,163
$1,961,600
1/24
$2,027,413
$2,716,050
$1,963,631
2/24
$2,052,489
$2,861,075
$2,036,068
3/24
$2,159,834
$2,953,129
$2,137,861
4/24
$2,082,697
$2,832,509
$2,046,541
5/24
$2,140,866
$2,972,958
$2,111,417
6/24
$2,116,273
$3,079,634
$2,091,556
7/24
$2,228,057
$3,117,121
$2,198,479
8/24
$2,264,895
$3,192,732
$2,257,454
9/24
$2,293,102
$3,260,920
$2,288,787
10/24
$2,252,176
$3,231,348
$2,263,597
11/24
$2,373,674
$3,421,031
$2,408,147
12/24
$2,220,445
$3,339,480
$2,243,448
1/25
$2,274,943
$3,432,476
$2,347,286
2/25
$2,286,093
$3,387,689
$2,356,817
Average Annual Return [Table Text Block]
Fund
1 Year
5 Years
10 Years
Class I
11.38%
11.46%
8.61%
S&P 500® Index
18.41%
16.84%
12.97%
Russell 1000® Value Index
15.75%
12.50%
8.94%
AssetsNet $ 21,524,016
Holdings Count | Holding 191
Advisory Fees Paid, Amount $ 0
InvestmentCompanyPortfolioTurnover 53.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets
$21,524,016
# of Portfolio Holdings
191
Portfolio Turnover Rate
53%
Total Advisory Fees Paid (net of waiver)
$0
Holdings [Text Block]

Sector Allocation (% of total investments)

Group By Asset Type Chart
Value
Value
Short-Term Investments
0.4%
Communication Services
5.1%
Consumer Discretionary
9.9%
Information Technology
10.3%
Industrials
10.4%
Materials
10.4%
Energy
10.6%
Financials
10.6%
Utilities
10.6%
Consumer Staples
10.7%
Health Care
11.0%

Top Ten Holdings (% of total investments)Footnote Referencea

Royalty Pharma PLC, Class A
0.7%
National Fuel Gas Co.
0.7%
AT&T, Inc.
0.6%
Philip Morris International, Inc.
0.6%
American Electric Power Co., Inc.
0.6%
AbbVie, Inc.
0.6%
Fidelity National Financial, Inc.
0.6%
LKQ Corp.
0.6%
Gilead Sciences, Inc.
0.6%
Devon Energy Corp.
0.6%
Total
6.2%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-260-0761