The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

	INVESTMENT CLASS	SERVICE CLASS	INSTITUTIONAL CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%	0.00%
Maximum deferred sales charge	0.00%	0.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%	0.00%

Annual Fund Operating Expenses [Table]


Management fees	1.00%	1.00%	1.00%
Distribution and/or service (12b-1) fees	0.00%	0.25%	0.00%
Other expenses	0.40%	0.48%	0.38%
Total annual Fund operating expenses	1.40%	1.73%	1.38%
Fee waivers and/or expense reimbursements	-0.21%	-0.29%	-0.34%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	1.19%	1.44%	1.04%

Expense Example Narrative [Text Block]

	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 total operating expenses (net of fee waivers and/or expense reimbursements for the Investment, Service, and Institutional Classes in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

22.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	INVESTMENT CLASS	SERVICE CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%
Maximum deferred sales charge	0.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%

Annual Fund Operating Expenses [Table]


Management fees	1.00%	1.00%
Distribution and/or service (12b-1) fees	0.00%	0.25%
Other expenses	0.26%	0.32%
Total annual Fund operating expenses	1.26%	1.57%
Fee waivers and/or expense reimbursements	-0.02%	-0.08%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	1.24%	1.49%

Expense Example Narrative [Text Block]


	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 total operating expenses (net of fee waivers and/or expense reimbursements for the Investment and Service Classes in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

38.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	INVESTMENT CLASS	SERVICE CLASS	INSTITUTIONAL CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%	0.00%
Maximum deferred sales charge	0.00%	0.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%	0.00%

Annual Fund Operating Expenses [Table]


Management fees	1.00%	1.00%	1.00%
Distribution and/or service (12b-1) fees	0.00%	0.25%	0.00%
Other expenses	0.22%	0.39%	0.15%
Total annual Fund operating expenses	1.22%	1.64%	1.15%
Fee waivers and/or expense reimbursements	0.00%	-0.15%	0.00%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	1.22%	1.49%	1.15%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements for the Service Class in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

20.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	INVESTMENT CLASS	SERVICE CLASS	INSTITUTIONAL CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%	0.00%
Maximum deferred sales charge	0.00%	0.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%	0.00%
Annual Trustee’s Fee—applies only to GiftShare Accounts*	$50	$50	N/A

Annual Fund Operating Expenses [Table]


Management fees	0.76%	0.76%	0.76%
Distribution and/or service (12b-1) fees	0.00%	0.25%	0.00%
Other expenses	0.19%	0.30%	0.15%
Total annual Fund operating expenses	0.95%	1.31%	0.91%

Expense Example Narrative [Text Block]

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 total operating expenses remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

43.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	INVESTMENT CLASS	SERVICE CLASS	INSTITUTIONAL CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%	0.00%
Maximum deferred sales charge	0.00%	0.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%	0.00%

Annual Fund Operating Expenses [Table]


Management fees	1.00%	1.00%	1.00%
Distribution and/or service (12b-1) fees	0.00%	0.25%	0.00%
Other expenses	0.24%	0.35%	0.14%
Total annual Fund operating expenses	1.24%	1.60%	1.14%
Fee waivers and/or expense reimbursements	0.00%	-0.11%	0.00%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	1.24%	1.49%	1.14%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements for the Service Class in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

51.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	INVESTMENT CLASS	SERVICE CLASS	INSTITUTIONAL CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%	0.00%
Maximum deferred sales charge	0.00%	0.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%	0.00%

Annual Fund Operating Expenses [Table]


Management fees	1.00%	1.00%	1.00%
Distribution and/or service (12b-1) fees	0.00%	0.25%	0.00%
Other expenses	0.25%	0.39%	0.18%
Total annual Fund operating expenses	1.25%	1.64%	1.18%
Fee waivers and/or expense reimbursements	-0.01%	-0.15%	0.00%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	1.24%	1.49%	1.18%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements for the Investment and Service Classes in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

12.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below. INVESTMENT CLASS

Shareholder Fees [Table]

	INVESTMENT CLASS	SERVICE CLASS	INSTITUTIONAL CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%	0.00%
Maximum deferred sales charge	0.00%	0.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%	0.00%

Annual Fund Operating Expenses [Table]


Management fees	1.00%	1.00%	1.00%
Distribution and/or service (12b-1) fees	0.00%	0.25%	0.00%
Other expenses	0.23%	0.35%	0.14%
Total annual Fund operating expenses	1.23%	1.60%	1.14%
Fee waivers and/or expense reimbursements	0.00%	-0.11%	-0.12%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	1.23%	1.49%	1.02%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements for the Service and Institutional Classes in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

59.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]


	INVESTMENT CLASS	SERVICE CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%
Maximum deferred sales charge	0.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%

Annual Fund Operating Expenses [Table]


Management fees	1.00%	1.00%
Distribution and/or service (12b-1) fees	0.00%	0.25%
Other expenses	0.38%	0.37%
Total annual Fund operating expenses	1.38%	1.62%
Fee waivers and/or expense reimbursements	-0.14%	-0.13%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	1.24%	1.49%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements for the Investment and Service Classes in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

51.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	INVESTMENT CLASS	SERVICE CLASS	INSTITUTIONAL CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%	0.00%
Maximum deferred sales charge	0.00%	0.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%	0.00%

Annual Fund Operating Expenses [Table]


Management fees	1.00%	1.00%	1.00%
Distribution and/or service (12b-1) fees	0.00%	0.25%	0.00%
Other expenses	0.28%	0.32%	0.50%
Total annual Fund operating expenses	1.28%	1.57%	1.50%
Fee waivers and/or expense reimbursements	-0.26%	-0.08%	-0.48%
Total annual Fund operating expenses after fee waivers and/or
expense reimbursements	1.02%	1.49%	1.02%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements for the Investment, Service, and Institutional Classes in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

75.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	INVESTMENT CLASS	SERVICE CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%
Maximum deferred sales charge	0.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%

Annual Fund Operating Expenses [Table]


Management fees	0.85%	0.85%
Distribution and/or service (12b-1) fees	0.00%	0.25%
Other expenses	0.46%	0.56%
Total annual Fund operating expenses	1.31%	1.66%
Fee waivers and/or expense reimbursements	-0.22%	-0.32%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	1.09%	1.34%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements for the Investment and Service Classes in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

47.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

Shareholder Fees (fees paid directly from your investment)
Royce Micro-Cap Fund - Consultant Class	CONSULTANT CLASS
Maximum sales charge (load) imposed on purchases	0.00%
Maximum deferred sales charge on purchases held for less than 365 days (as a percentage of net asset value at the time of purchase or
redemption, whichever is less)	1.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%

Annual Fund Operating Expenses [Table]


Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management fees	1.00%
Distribution and/or service (12b-1) fees	1.00%
Other expenses	0.49%
Total annual Fund operating expenses	2.49%
Fee waivers and/or expense reimbursements	-0.25%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	2.24%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

38.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

Shareholder Fees (fees paid directly from your investment)
	CONSULTANT CLASS
Maximum sales charge (load) imposed on purchases	0.00%
Maximum deferred sales charge on purchases held for less than 365 days (as a percentage of net asset value at the time of purchase or redemption, whichever is less)	1.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%

Annual Fund Operating Expenses [Table]


Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management fees	1.00%
Distribution and/or service (12b-1) fees	1.00%
Other expenses	0.46%
Total annual Fund operating expenses	2.46%
Fee waivers and/or expense reimbursements	-0.22%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	2.24%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

20.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	CONSULTANT CLASS
Maximum sales charge (load) imposed on purchases	0.00%
Maximum deferred sales charge on purchases held for less than 365 days (as a percentage of net asset value at the time of purchase or redemption, whichever is less)	1.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%

Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management fees	0.76%
Distribution and/or service (12b-1) fees	1.00%
Other expenses	0.22%
Total annual Fund operating expenses	1.98%

Expense Example Narrative [Text Block]

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 total operating expenses remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

43.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	CONSULTANT CLASS	R CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%
Maximum deferred sales charge on purchases held for less than 365 days (as a percentage of net asset value at the time of purchase or redemption, whichever is less)	1.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%

Annual Fund Operating Expenses [Table]


Management fees	1.00%	1.00%
Distribution and/or service (12b-1) fees	1.00%	0.50%
Other expenses	0.38%	0.39%
Total annual Fund operating expenses	2.38%	1.89%
Fee waivers and/or expense reimbursements	-0.14%	0.00%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	2.24%	1.89%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements for the Consultant Class in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

51.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	CONSULTANT CLASS
Maximum sales charge (load) imposed on purchases	0.00%
Maximum deferred sales charge on purchases held for less than 365 days (as a percentage of net asset value at the time of purchase or redemption, whichever is less)	1.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%

Annual Fund Operating Expenses [Table]


Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management fees	1.00%
Distribution and/or service (12b-1) fees	1.00%
Other expenses	0.45%
Total annual Fund operating expenses	2.45%
Fee waivers and/or expense reimbursements	-0.21%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	2.24%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

12.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund. Shares of the Fund purchased or held through a third party, such as a broker-dealer, bank, or other financial intermediary, may incur fees and expenses that are not reflected in the tables and examples below.

Shareholder Fees [Table]

	CONSULTANT CLASS	R CLASS
Maximum sales charge (load) imposed on purchases	0.00%	0.00%
Maximum deferred sales charge on purchases held for less than 365 days (as a percentage of net asset value at the time of purchase or redemption, whichever is less)	1.00%	0.00%
Maximum sales charge (load) imposed on reinvested dividends	0.00%	0.00%

Annual Fund Operating Expenses [Table]


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

Management fees	1.00%	1.00%
Distribution and/or service (12b-1) fees	1.00%	0.50%
Other expenses	0.27%	0.44%
Total annual Fund operating expenses	2.27%	1.94%
Fee waivers and/or expense reimbursements	-0.03%	0.00%
Total annual Fund operating expenses	2.24%	1.94%

Expense Example Narrative [Text Block]

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 total operating expenses (net of fee waivers and/or expense reimbursements for the Consultant Class in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

59.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund.

You may qualify for Class A sales charge discounts from certain financial intermediaries if you and your family invest, or agree to invest in the future, at least $25,000 in certain Royce, Franklin Templeton, and Legg Mason funds. More information about these and other sales charge discounts and waivers is available from your financial intermediary, under the heading “General Shareholder Information−Sales Charges” in this Prospectus (pages 20-21), in Appendix A: Sales Charge Waivers and Discounts from Certain Financial Intermediaries, and under the heading “Sales Charge Waivers and Reductions for A Class Shares” in The Royce Fund’s Statement of Additional Information. “Financial intermediaries” include banks, brokers, dealers, insurance companies, investment advisers, financial consultants or advisers, and other financial intermediaries that have entered into an agreement with Royce Fund Services, LLC to sell Fund shares.

Expense Breakpoint, Minimum Investment Required [Amount]

$ 25,000

Shareholder Fees [Table]

Shareholder Fees (fees paid directly from your investment)
Royce Premier Fund - A Class	A CLASS
Maximum sales charge (load) imposed on purchases	5.25%¹
Maximum deferred sales charge	None²
Maximum sales charge (load) imposed on reinvested dividends	0.00%

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Annual Fund Operating Expenses [Table]


Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) Management fees	1.00%
Distribution and/or service (12b-1) fees	0.25%
Other expenses	0.39%
Total annual Fund operating expenses	1.64%
Fee waivers and/or expense reimbursements	-0.15%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	1.49%

Expense Example Narrative [Text Block]

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. The example also assumes that your investment has a 5% return each year and that the Fund’s total operating expenses (net of fee waivers and/or expense reimbursements in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Expense Example, No Redemption [Table]

	A CLASS
1 Year (without redemption of any of your shares)³	$668

Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in total annual Fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 20% of the average value of its portfolio.

Expense Heading [Optional Text]

Fees and Expenses of the Fund

Expense Breakpoint Discounts [Text]

You may qualify for Class A sales charge discounts from certain financial intermediaries if you and your family invest, or agree to invest in the future, at least $25,000 in certain Royce, Franklin Templeton, and Legg Mason funds.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Optional Text]

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

Expense Example [Heading]

Example

Expense Example, With Redemption [Table]

1 Year (with redemption of all of your shares)⁴	$237
3 Years (with or without redemption of all of your shares)³	$918
5 Years (with or without redemption of all of your shares)³	$1,206
10 Years (with or without redemption of all of your shares)³	$2,023

³

Assumes your investment is subject to the maximum initial sales charge of 5.25%.

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%.

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

43.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund.

You may qualify for Class A sales charge discounts from certain financial intermediaries if you and your family invest, or agree to invest in the future, at least $25,000 in certain Royce, Franklin Templeton, and Legg Mason funds. More information about these and other sales charge discounts and waivers is available from your financial intermediary, under the heading “General Shareholder Information−Sales Charges” in this Prospectus (pages 20-21), in Appendix A: Sales Charge Waivers and Discounts from Certain Financial Intermediaries, and under the heading “Sales Charge Waivers and Reductions for A Class Shares” in The Royce Fund’s Statement of Additional Information. “Financial intermediaries” include banks, brokers, dealers, insurance companies, investment advisers, financial consultants or advisers, and other financial intermediaries that have entered into an agreement with Royce Fund Services, LLC to sell Fund shares.

Shareholder Fees [Table]

Shareholder Fees (fees paid directly from your investment)
	A CLASS
Maximum sales charge (load) imposed on purchases	5.25%¹
Maximum deferred sales charge	None²
Maximum sales charge (load) imposed on reinvested dividends	0.00%

Annual Fund Operating Expenses [Table]


Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) Management fees	1.00%
Distribution and/or service (12b-1) fees	0.25%
Other expenses	0.39%
Total annual Fund operating expenses	1.64%
Fee waivers and/or expense reimbursements	-0.15%
Total annual Fund operating expenses after fee waivers and/or expense reimbursements	1.49%

Expense Example Narrative [Text Block]

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. The example also assumes that your investment has a 5% return each year and that the Fund’s total operating expenses (net of fee waivers and/or expense reimbursements in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:

Expense Example, No Redemption [Table]

	A CLASS
1 Year (without redemption of any of your shares)³	$668

Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in total annual Fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 12% of the average value of its portfolio.