v3.26.1
Shareholder Report, Average Annual Return (Details)
 6 Months Ended 12 Months Ended 33 Months Ended 60 Months Ended 118 Months Ended 120 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
C000015937            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Champlain Small Company Fund, Advisor Shares          
C000173316            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Champlain Small Company Fund, Institutional Shares          
C000065363            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Champlain Mid Cap Fund, Advisor Shares          
C000096284            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Champlain Mid Cap Fund, Institutional Shares          
C000245657            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Champlain Strategic Focus Fund, Institutional Shares          
Without Sales Load [Member] | C000015937            
Average Annual Return [Line Items]            
Average Annual Return, Percent   3.34%   1.59%   9.01%
Without Sales Load [Member] | C000173316            
Average Annual Return [Line Items]            
Average Annual Return, Percent   3.62%   1.85% 8.50%  
Without Sales Load [Member] | C000065363            
Average Annual Return [Line Items]            
Average Annual Return, Percent   1.56%   0.45%   9.82%
Without Sales Load [Member] | C000096284            
Average Annual Return [Line Items]            
Average Annual Return, Percent   1.80%   0.71%   10.10%
Without Sales Load [Member] | C000245657            
Average Annual Return [Line Items]            
Average Annual Return, Percent   2.63% 9.83%      
Russell 3000 Index (USD) (TR)            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name [1] Russell 3000 Index (USD) (TR)          
Average Annual Return, Percent   22.81%   12.30%   15.06%
Russell 3000 Index (USD) (TR)            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name [2] Russell 3000 Index (USD) (TR)          
Average Annual Return, Percent   22.81%   12.30% 14.84%  
Russell 3000 Index (USD) (TR)            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name [3] Russell 3000 Index (USD) (TR)          
Average Annual Return, Percent   22.81%   12.30%   15.06%
Russell 3000 Index (USD) (TR)            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name [4] Russell 3000 Index (USD) (TR)          
Average Annual Return, Percent   22.81%   12.30%   15.06%
Russell 3000 Index (USD) (TR)            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name [5] Russell 3000 Index (USD) (TR)          
Average Annual Return, Percent   22.81% 23.55%      
Russell 2000 Index (USD) (TR)            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name [1] Russell 2000 Index (USD) (TR)          
Average Annual Return, Percent   40.78%   6.98%   11.62%
Russell 2000 Index (USD) (TR)            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name [2] Russell 2000 Index (USD) (TR)          
Average Annual Return, Percent   40.78%   6.98% 10.97%  
Russell Midcap Index (USD) (TR)            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name [3] Russell Midcap Index (USD) (TR)          
Average Annual Return, Percent   21.63%   8.50%   12.00%
Russell Midcap Index (USD) (TR)            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name [4] Russell Midcap Index (USD) (TR)          
Average Annual Return, Percent   21.63%   8.50%   12.00%
Russell Midcap Growth Benchmark Index (USD) (TR)            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name [5],[6] Russell Midcap Growth Benchmark Index (USD) (TR)          
Average Annual Return, Percent   6.17% 19.45%      
[1] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[2] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[3] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[4] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[5] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[6] As of March 2025, the benchmark name changed from Russell Midcap Growth Index to Russell Midcap Growth Benchmark Index, to reflect that it follows an uncapped methodology. Specifically, the Russell Midcap Growth Benchmark Index reflects the full market-cap weightings and does not apply the capping constraints introduced in 2025.