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S000010027 [Member] Annual Fund Operating Expenses - The MidCap Growth Fund - Shares
Oct. 31, 2025
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.30% [1]
Other Expenses (as a percentage of Assets): 0.33%
Acquired Fund Fees and Expenses 0.01%
Expenses (as a percentage of Assets) 0.64% [2]
[1] Management fees have been restated to reflect current fees.
[2] The “Total Annual Fund Operating Expenses” do not correlate to the ratios of net and total expenses to average net assets provided in the Financial Highlights, which reflect the operating expenses of the Fund and do not include Acquired (Underlying) Fund Fees and Expenses.