v3.26.1
Expense Example
May 01, 2026
USD ($)
Royce International Premier Fund | Royce International Premier Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 121
Expense Example, with Redemption, 3 Years 422
Expense Example, with Redemption, 5 Years 746
Expense Example, with Redemption, 10 Years 1,662
Royce International Premier Fund | Royce International Premier Fund - Service Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 147
Expense Example, with Redemption, 3 Years 517
Expense Example, with Redemption, 5 Years 911
Expense Example, with Redemption, 10 Years 2,017
Royce International Premier Fund | Royce International Premier Fund - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 106
Expense Example, with Redemption, 3 Years 403
Expense Example, with Redemption, 5 Years 723
Expense Example, with Redemption, 10 Years 1,628
Royce Micro-Cap Fund | Royce Micro-Cap Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 126
Expense Example, with Redemption, 3 Years 398
Expense Example, with Redemption, 5 Years 690
Expense Example, with Redemption, 10 Years 1,521
Royce Micro-Cap Fund | Royce Micro-Cap Fund - Service Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 152
Expense Example, with Redemption, 3 Years 488
Expense Example, with Redemption, 5 Years 848
Expense Example, with Redemption, 10 Years 1,861
Royce Premier Fund | Royce Premier Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 124
Expense Example, with Redemption, 3 Years 387
Expense Example, with Redemption, 5 Years 670
Expense Example, with Redemption, 10 Years 1,477
Royce Premier Fund | Royce Premier Fund - Service Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 152
Expense Example, with Redemption, 3 Years 503
Expense Example, with Redemption, 5 Years 878
Expense Example, with Redemption, 10 Years 1,931
Royce Premier Fund | Royce Premier Fund - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 117
Expense Example, with Redemption, 3 Years 365
Expense Example, with Redemption, 5 Years 633
Expense Example, with Redemption, 10 Years 1,398
Royce Small-Cap Fund | Royce Small-Cap Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 97
Expense Example, with Redemption, 3 Years 303
Expense Example, with Redemption, 5 Years 525
Expense Example, with Redemption, 10 Years 1,166
Royce Small-Cap Fund | Royce Small-Cap Fund - Service Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 133
Expense Example, with Redemption, 3 Years 415
Expense Example, with Redemption, 5 Years 718
Expense Example, with Redemption, 10 Years 1,579
Royce Small-Cap Fund | Royce Small-Cap Fund - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 93
Expense Example, with Redemption, 3 Years 290
Expense Example, with Redemption, 5 Years 504
Expense Example, with Redemption, 10 Years 1,120
Royce Small-Cap Opportunity Fund | Royce Small-Cap Opportunity Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 126
Expense Example, with Redemption, 3 Years 393
Expense Example, with Redemption, 5 Years 681
Expense Example, with Redemption, 10 Years 1,500
Royce Small-Cap Opportunity Fund | Royce Small-Cap Opportunity Fund - Service Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 152
Expense Example, with Redemption, 3 Years 494
Expense Example, with Redemption, 5 Years 860
Expense Example, with Redemption, 10 Years 1,891
Royce Small-Cap Opportunity Fund | Royce Small-Cap Opportunity Fund - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 116
Expense Example, with Redemption, 3 Years 362
Expense Example, with Redemption, 5 Years 628
Expense Example, with Redemption, 10 Years 1,386
Royce Small-Cap Special Equity Fund | Royce Small-Cap Special Equity Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 126
Expense Example, with Redemption, 3 Years 396
Expense Example, with Redemption, 5 Years 685
Expense Example, with Redemption, 10 Years 1,510
Royce Small-Cap Special Equity Fund | Royce Small-Cap Special Equity Fund - Service Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 152
Expense Example, with Redemption, 3 Years 503
Expense Example, with Redemption, 5 Years 878
Expense Example, with Redemption, 10 Years 1,931
Royce Small-Cap Special Equity Fund | Royce Small-Cap Special Equity Fund - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 120
Expense Example, with Redemption, 3 Years 375
Expense Example, with Redemption, 5 Years 649
Expense Example, with Redemption, 10 Years 1,432
Royce Small-Cap Total Return Fund | Royce Small-Cap Total Return Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 125
Expense Example, with Redemption, 3 Years 390
Expense Example, with Redemption, 5 Years 676
Expense Example, with Redemption, 10 Years 1,489
Royce Small-Cap Total Return Fund | Royce Small-Cap Total Return Fund - Service Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 152
Expense Example, with Redemption, 3 Years 494
Expense Example, with Redemption, 5 Years 860
Expense Example, with Redemption, 10 Years 1,891
Royce Small-Cap Total Return Fund | Royce Small-Cap Total Return Fund - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 104
Expense Example, with Redemption, 3 Years 350
Expense Example, with Redemption, 5 Years 616
Expense Example, with Redemption, 10 Years 1,375
Royce Small-Cap Value Fund | Royce Small-Cap Value Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 126
Expense Example, with Redemption, 3 Years 423
Expense Example, with Redemption, 5 Years 742
Expense Example, with Redemption, 10 Years 1,645
Royce Small-Cap Value Fund | Royce Small-Cap Value Fund - Service Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 152
Expense Example, with Redemption, 3 Years 498
Expense Example, with Redemption, 5 Years 869
Expense Example, with Redemption, 10 Years 1,911
Royce Smaller-Companies Growth Fund | Royce Smaller-Companies Growth Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 104
Expense Example, with Redemption, 3 Years 380
Expense Example, with Redemption, 5 Years 677
Expense Example, with Redemption, 10 Years 1,522
Royce Smaller-Companies Growth Fund | Royce Smaller-Companies Growth Fund - Service Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 152
Expense Example, with Redemption, 3 Years 488
Expense Example, with Redemption, 5 Years 848
Expense Example, with Redemption, 10 Years 1,861
Royce Smaller-Companies Growth Fund | Royce Smaller-Companies Growth Fund - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 104
Expense Example, with Redemption, 3 Years 427
Expense Example, with Redemption, 5 Years 773
Expense Example, with Redemption, 10 Years 1,750
Royce SMid-Cap Total Return Fund | Royce Smid-Cap Total Return Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 111
Expense Example, with Redemption, 3 Years 394
Expense Example, with Redemption, 5 Years 697
Expense Example, with Redemption, 10 Years 1,560
Royce SMid-Cap Total Return Fund | Royce Smid-Cap Total Return Fund - Service Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 136
Expense Example, with Redemption, 3 Years 492
Expense Example, with Redemption, 5 Years 872
Expense Example, with Redemption, 10 Years 1,939
Royce Micro-Cap Fund - Consultant Class | Royce Micro-Cap Fund | Royce Micro-Cap Fund - Consultant Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 227
Expense Example, with Redemption, 3 Years 752
Expense Example, with Redemption, 5 Years 1,303
Expense Example, with Redemption, 10 Years 2,807
Royce Premier Fund - Consultant Class | Royce Premier Fund | Royce Premier Fund - Consultant Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 227
Expense Example, with Redemption, 3 Years 746
Expense Example, with Redemption, 5 Years 1,291
Expense Example, with Redemption, 10 Years 2,780
Royce Small-Cap Fund - Consultant Class | Royce Small-Cap Fund | Royce Small-Cap Fund - Consultant Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 201
Expense Example, with Redemption, 3 Years 621
Expense Example, with Redemption, 5 Years 1,068
Expense Example, with Redemption, 10 Years 2,306
Royce Small-Cap Opportunity Fund - Consultant & R Class | Royce Small-Cap Opportunity Fund | Royce Small-Cap Opportunity Fund - Consultant Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 227
Expense Example, with Redemption, 3 Years 729
Expense Example, with Redemption, 5 Years 1,258
Expense Example, with Redemption, 10 Years 2,706
Royce Small-Cap Opportunity Fund - Consultant & R Class | Royce Small-Cap Opportunity Fund | Royce Small-Cap Opportunity Fund - R Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 192
Expense Example, with Redemption, 3 Years 594
Expense Example, with Redemption, 5 Years 1,021
Expense Example, with Redemption, 10 Years 2,212
Royce Small-Cap Special Equity Fund - Consultant Class | Royce Small-Cap Special Equity Fund | Royce Small-Cap Special Equity Fund - Consultant Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 227
Expense Example, with Redemption, 3 Years 744
Expense Example, with Redemption, 5 Years 1,287
Expense Example, with Redemption, 10 Years 2,770
Royce Small-Cap Total Return Fund - Consultant & R Class | Royce Small-Cap Total Return Fund | Royce Small-Cap Total Return Fund - Consultant Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 227
Expense Example, with Redemption, 3 Years 706
Expense Example, with Redemption, 5 Years 1,212
Expense Example, with Redemption, 10 Years 2,603
Royce Small-Cap Total Return Fund - Consultant & R Class | Royce Small-Cap Total Return Fund | Royce Small-Cap Total Return Fund - R Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 197
Expense Example, with Redemption, 3 Years 609
Expense Example, with Redemption, 5 Years 1,047
Expense Example, with Redemption, 10 Years 2,264
Royce Premier Fund - A Class | Royce Premier Fund | Royce Premier Fund - A Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 255 [1]
Expense Example, with Redemption, 3 Years 1,001 [2]
Expense Example, with Redemption, 5 Years 1,357 [2]
Expense Example, with Redemption, 10 Years 2,357 [2]
Royce Small-Cap Fund - A Class | Royce Small-Cap Fund | Royce Small-Cap Fund - A Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 237 [3]
Royce Small-Cap Special Equity Fund - A Class | Royce Small-Cap Special Equity Fund | Royce Small-Cap Special Equity Fund - A Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 255 [4]
Expense Example, with Redemption, 3 Years 1,001 [5]
Expense Example, with Redemption, 5 Years 1,357 [5]
Expense Example, with Redemption, 10 Years $ 2,357 [5]
[1] Assumes your investment is not subject to an initial sales charge but that your redemption of all of your shares is subject to a deferred sales charge of 1.00%.
[2] Assumes your investment is subject to the maximum initial sales charge of 5.25%.
[3] Assumes your investment is not subject to an initial sales charge but that your redemption of all of your shares is subject to a deferred sales charge of 1.00%.
[4] Assumes your investment is not subject to an initial sales charge but that your redemption of all of your shares is subject to a deferred sales charge of 1.00%.
[5] Assumes your investment is subject to the maximum initial sales charge of 5.25%.