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Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000795264
Thompson LargeCap Fund (Prospectus Summary) | Thompson LargeCap Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading

LARGECAP FUND

Risk/Return Supplement ck0000795264_SupplementTextBlock

THOMPSON IM FUNDS, INC.

 

LARGECAP FUND

 

Supplement Dated January 23, 2018 to Prospectus Dated March 31, 2017

   

Change in Expense Reimbursement for the LargeCap Fund and MidCap Fund

 

Thompson Investment Management, Inc., investment advisor to the Funds, has contractually agreed to increase the amount of expenses it will reimburse the LargeCap Fund and MidCap Fund. Effective December 1, 2017, the Advisor has contractually agreed to waive management fees and/or reimburse expenses incurred by the LargeCap Fund and MidCap Fund through March 31, 2019, so that the annual operating expenses of the LargeCap Fund do not exceed 1.05% of its average daily net assets and the annual operating expenses of the MidCap Fund do not exceed 1.15% of its average daily net assets. The previous expense limitations were 1.10% for the LargeCap Fund and 1.20% for the MidCap Fund.

 

As a result of these changes:

 

The following table and related text on Page 3 of the Prospectus relating to the LargeCap Fund are deleted and replaced in their entirety by the following:

Operating Expenses, Caption rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Expense Example, Heading rr_ExpenseExampleHeading

Example

Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

 

The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.

Expense Example by, Year, Caption rr_ExpenseExampleByYearCaption

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Thompson LargeCap Fund (Prospectus Summary) | Thompson LargeCap Fund | Thompson LargeCap Fund  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.95%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.30%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.25%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.20%) [1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.05%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

March 31, 2019

Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 377
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 667
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,494
[1] The Advisor has contractually agreed to waive management fees and/or reimburse expenses incurred by the LargeCap Fund through March 31, 2019, so that the annual operating expenses of the Fund do not exceed 1.05% of its average daily net assets. This waiver/reimbursement may only be terminated by the Advisor with the consent of the Board of Directors of the Funds.