Perkins Small Cap Value Fund | Class A, C, S, I, N, R, T Shares

Fund summary

Perkins Small Cap Value Fund

INVESTMENT OBJECTIVE

Perkins Small Cap Value Fund seeks capital appreciation.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold Shares of the Fund. Each share class has different expenses, but represents an investment in the same Fund.

For Class A Shares, you may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund or in other Janus mutual funds. More information about these and other discounts, as well as eligibility requirements for each share class, is available from your financial professional and in the "Purchases" section on page 60 of the Fund's Prospectus and in the "Purchases" section on page 83 of the Fund's Statement of Additional Information.

SHAREHOLDER FEES
(fees paid directly from your investment)

Shareholder Fees Perkins Small Cap Value Fund Class A, C, S, I, N, R, T Shares	Class A	Class C	Class S	Class I	Class N	Class R	Class T
Shareholder Fees Column [Text]	Class A	Class C	Class S	Class I	Class N	Class R	Class T
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price)	5.75%	none	none	none	none	none	none
Maximum Deferred Sales Charge (load) (as a percentage of the lower of original purchase price or redemption proceeds)	none	1.00%	none	none	none	none	none

ANNUAL FUND OPERATING EXPENSES
(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Perkins Small Cap Value Fund Class A, C, S, I, N, R, T Shares		Class A	Class C	Class S	Class I	Class N	Class R	Class T
Operating Expenses Column [Text]		Class A	Class C	Class S	Class I	Class N	Class R	Class T
Management Fees (may adjust up or down)		0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%
Distribution/Service (12b-1) Fees		0.25%	1.00%	0.25%	none	none	0.50%	none
Other Expenses	[1]	0.39%	0.30%	0.29%	0.14%	0.04%	0.29%	0.30%
Total Annual Fund Operating Expenses	[2]	1.39%	2.05%	1.29%	0.89%	0.79%	1.54%	1.05%
Fee Waiver	[2]	0.15%	0.06%	none	none	none	none	none
Total Annual Fund Operating Expenses After Fee Waiver	[2]	1.24%	1.99%	1.29%	0.89%	0.79%	1.54%	1.05%

EXAMPLE:

The following Example is based on expenses without waivers. The 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 reinvest all dividends and distributions. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses without waivers remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

If Shares are redeemed:

Expense Example Class A, C, S, I, N, R, T Shares Perkins Small Cap Value Fund (USD $)	Expense Example, By Year, Column [Text]	1 Year	3 Years	5 Years	10 Years
Class A	Class A Shares	708	990	1,292	2,148
Class C	Class C Shares	308	643	1,103	2,379
Class S	Class S Shares	131	409	708	1,556
Class I	Class I Shares	91	284	493	1,096
Class N	Class N Shares	81	252	439	978
Class R	Class R Shares	157	486	839	1,834
Class T	Class T Shares	107	334	579	1,283

If Shares are not redeemed:

Expense Example, No Redemption Class A, C, S, I, N, R, T Shares Perkins Small Cap Value Fund (USD $)	Expense Example, No Redemption, By Year, Column [Text]	1 Year	3 Years	5 Years	10 Years
Class A	Class A Shares	708	990	1,292	2,148
Class C	Class C Shares	208	643	1,103	2,379
Class S	Class S Shares	131	409	708	1,556
Class I	Class I Shares	91	284	493	1,096
Class N	Class N Shares	81	252	439	978
Class R	Class R Shares	157	486	839	1,834
Class T	Class T Shares	107	334	579	1,283

Portfolio Turnover:

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 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 62% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund pursues its investment objective by investing primarily in the common stocks of small companies whose stock prices are believed to be undervalued by the Fund’s portfolio managers. The Fund invests, under normal circumstances, at least 80% of its net assets in equity securities of small companies whose market capitalization, at the time of initial purchase, is less than the 12-month average of the maximum market capitalization for companies included in the Russell 2000^® Value Index. This average is updated monthly. The market capitalizations within the index will vary, but as of June 30, 2012, they ranged from approximately $85 million to $2.7 billion. The Fund may also invest in foreign equity and debt securities, which may include investments in emerging markets. The Fund may invest, under normal circumstances, up to 20% of its net assets in securities of companies having market capitalizations outside of the aforementioned market capitalization ranges. In addition, when the portfolio managers believe that market conditions are unfavorable for investing, or when they are otherwise unable to locate attractive investment opportunities, the Fund may invest up to 20% of its net assets in cash or similar investments.

The Fund’s securities selection focuses on companies that are out of favor with markets or have not yet been discovered by the broader investment community.

The Fund’s portfolio managers generally look for companies with:

• strong balance sheets and solid recurring free cash flows
• attractive relative and absolute valuation ratios or that have underperformed recently
• favorable reward to risk characteristics

The portfolio managers’ philosophy is to weigh a security’s downside risk before considering its upside potential, which may help provide an element of capital preservation.

PRINCIPAL INVESTMENT RISKS

The biggest risk is that the Fund’s returns will vary, and you could lose money. The Fund is designed for long-term investors seeking an equity portfolio, including common stocks. Common stocks tend to be more volatile than many other investment choices.

Value Investing Risk. Because different types of stocks tend to shift in and out of favor depending on market and economic conditions, “value” stocks may perform differently than other types of stocks and from the market as a whole, and can continue to be undervalued by the market for long periods of time. It is also possible that a value stock will never appreciate to the extent expected by the Fund’s portfolio managers. When the Fund’s investments in cash or similar investments increase due to a lack of favorable investment opportunities or other extraordinary factors, the Fund may not participate in market advances or declines to the same extent that it would if the Fund had been fully invested.

Market Risk. The value of the Fund’s portfolio may decrease if the value of an individual company or security, or multiple companies or securities, in the portfolio decreases or if the portfolio managers’ belief about a company’s intrinsic worth is incorrect. Further, regardless of how well individual companies or securities perform, the value of the Fund’s portfolio could also decrease if there are deteriorating economic or market conditions. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Small-Sized Companies Risk. The Fund’s investments in securities issued by small-sized companies, which tend to be smaller, start-up companies offering emerging products or services, may involve greater risks than are customarily associated with larger, more established companies. Securities issued by small-sized companies tend to be more volatile and somewhat more speculative than securities issued by larger or more established companies and may underperform as compared to the securities of larger companies.

Real Estate Risk. The Fund may be affected by risks associated with investments in real estate-related securities. The value of securities of issuers in the real estate and real estate-related industries, including real estate investment trusts, is sensitive to changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, supply and demand, and the management skill and creditworthiness of the issuer. These factors may impact the Fund’s investments in foreign real estate markets differently than U.S. real estate markets.

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

PERFORMANCE INFORMATION

The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. Class T Shares (formerly named Class J Shares) of the Fund commenced operations with the Fund’s inception. Class A Shares, Class C Shares, Class S Shares, Class I Shares, and Class R Shares of the Fund commenced operations on July 6, 2009. Class N Shares of the Fund commenced operations on May 31, 2012.

• The performance shown for Class T Shares for periods following April 21, 2003, reflects the fees and expenses of Class T Shares in effect during the periods shown, net of any applicable fee and expense limitations or waivers. For the periods prior to April 21, 2003, the performance shown for Class T Shares reflects the historical performance of Berger Small Cap Value Fund – Investor Shares (as a result of a prior reorganization of Berger Small Cap Value Fund – Investor Shares into the Fund’s former Class J Shares).
• The performance shown for Class A Shares, Class C Shares, Class S Shares, and Class R Shares reflects the performance of the Fund’s Class J Shares (formerly named Investor Shares) from April 21, 2003 to July 6, 2009, calculated using the fees and expenses of each respective share class, without the effect of any fee and expense limitations or waivers. For periods prior to April 21, 2003, the performance shown for Class A Shares, Class C Shares, Class S Shares, and Class R Shares reflects the historical performance of Berger Small Cap Value Fund – Investor Shares (as a result of a prior reorganization of Berger Small Cap Value Fund – Investor Shares into the Fund’s former Class J Shares), calculated using the fees and expenses of each respective share class, without the effect of any fee and expense limitations or waivers.
• The performance shown for Class I Shares reflects the performance of the Fund’s Class J Shares (formerly named Investor Shares) from April 21, 2003 to July 6, 2009, calculated using the fees and expenses of Class J Shares, net of any applicable fee and expense limitations or waivers. For the periods prior to April 21, 2003, the performance shown for Class I Shares reflects the historical performance of Berger Small Cap Value Fund – Investor Shares (as a result of a prior reorganization of Berger Small Cap Value Fund – Investor Shares into the Fund’s former Class J Shares), calculated using the fees and expenses of Class J Shares, net of any applicable fee and expense limitations or waivers.
• The performance shown for Class N Shares reflects the performance of the Fund’s Class T Shares from July 6, 2009 to December 31, 2011, calculated using the fees and expenses of Class T Shares, net of any applicable fee and expense limitations or waivers. For the period from April 21, 2003 to July 6, 2009, the performance shown for Class N Shares reflects the performance of the Fund’s Class J Shares (formerly named Investor Shares), calculated using the fees and expenses of Class J Shares, net of any applicable fee and expense limitations or waivers. For the periods prior to April 21, 2003, the performance shown for Class N Shares reflects the historical performance of Berger Small Cap Value Fund – Investor Shares (as a result of a prior reorganization of Berger Small Cap Value Fund – Investor Shares into the Fund’s former Class J Shares), calculated using the fees and expenses of Class J Shares, net of any applicable fee and expense limitations or waivers.

If Class A Shares, Class C Shares, Class S Shares, Class I Shares, and Class R Shares of the Fund had been available during periods prior to July 6, 2009, or Class N Shares of the Fund had been available during periods prior to December 31, 2011, the performance shown for each respective share class may have been different. The performance shown for periods following the Fund’s commencement of Class A Shares, Class C Shares, Class S Shares, Class I Shares, Class N Shares, and Class R Shares reflects the fees and expenses of each respective share class, net of any applicable fee and expense limitations or waivers.

The bar chart depicts the change in performance from year to year during the periods indicated. The bar chart figures do not include any applicable sales charges that an investor may pay when they buy or sell Class A Shares or Class C Shares of the Fund. If sales charges were included, the returns would be lower. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index. The index is not actively managed and is not available for direct investment. All figures assume reinvestment of dividends and distributions. For certain periods, the Fund’s performance reflects the effect of expense waivers. Without the effect of these expense waivers, the performance shown would have been lower.

The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janus.com/advisor/mutual-funds or by calling 1-877-335-2687.

Annual Total Returns for Class T Shares (calendar year-end)

Best Quarter:  Second Quarter 2009  23.04%          Worst Quarter:  Third Quarter 2002  −22.57%

The Fund's year-to-date return as of the calendar quarter ended September 30, 2012 was 6.24%.

Average Annual Total Returns (periods ended 12/31/11)

Average Annual Total Returns Perkins Small Cap Value Fund Class A, C, S, I, N, R, T Shares	Column	Label		1 Year	5 Years	10 Years
Class T Shares Return Before Taxes	Class T Shares	Return Before Taxes		(3.43%)	4.60%	7.23%
Class T Shares Return After Taxes on Distributions	Class T Shares	Return After Taxes on Distributions		(5.87%)	2.87%	5.36%
Class T Shares Return After Taxes on Distributions and Sale of Fund Shares	Class T Shares	Return After Taxes on Distributions and Sale of Fund Shares	[1]	(0.57%)	3.41%	5.73%
Class A Shares Return Before Taxes	Class A Shares	Return Before Taxes	[2]	(9.12%)	3.17%	6.34%
Class C Shares Return Before Taxes	Class C Shares	Return Before Taxes	[3]	(5.21%)	3.62%	6.22%
Class S Shares Return Before Taxes	Class S Shares	Return Before Taxes		(3.69%)	4.36%	6.98%
Class I Shares Return Before Taxes	Class I Shares	Return Before Taxes		(3.28%)	4.60%	7.23%
Class N Shares Return Before Taxes	Class N Shares	Return Before Taxes		(3.43%)	4.60%	7.23%
Class R Shares Return Before Taxes	Class R Shares	Return Before Taxes		(3.89%)	4.10%	6.72%
Russell 2000 Value Index (reflects no deduction for expenses, fees, or taxes)		Russell 2000® Value Index		(5.50%)	(1.87%)	6.40%

After-tax returns are calculated using distributions for the Fund’s Class T Shares (formerly named Class J Shares) for the periods following April 21, 2003; and for Berger Small Cap Value Fund – Investor Shares for periods prior to April 21, 2003. If Class T Shares of the Fund had been available during the periods prior to April 21, 2003, distributions may have been different and thus, after-tax returns may have been different from those shown. After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-deferred account, such as a 401(k) plan or an IRA.

After-tax returns are only shown for Class T Shares of the Fund. After-tax returns for the other classes of Shares will vary from those shown for Class T Shares due to varying sales charges (as applicable), fees, and expenses among the classes.

[1] Other Expenses for Class N Shares are based on the estimated expenses that the Shares expect to incur during their initial fiscal period.

[2] Janus Capital has contractually agreed to waive the Fund's total annual fund operating expenses (excluding any performance adjustments to management fees, the distribution and shareholder servicing fees - applicable to Class A Shares, Class C Shares, Class S Shares, and Class R Shares; administrative services fees payable pursuant to the Transfer Agency Agreement (except for networking and omnibus fees for Class A Shares, Class C Shares, and Class I Shares); brokerage commissions; interest; dividends; taxes; acquired fund fees and expenses; and extraordinary expenses) to 0.96% until at least November 1, 2013. The contractual waiver may be terminated or modified prior to this date only at the discretion of the Board of Trustees.

[1] If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund's other return figures.

[2] Calculated assuming maximum permitted sales loads.

[3] The one year return is calculated to include the contingent deferred sales charge.