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brokerage commissions and other charges when buying or selling shares of the fund, which are not reflected
in the table or example below.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
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fund operating expenses (expenses that you pay each
year as a percentage of the value of
your investment)</rr:OperatingExpensesCaption>
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      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
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    <rr:ManagementFeesOverAssets
      contextRef="Context_20240531_20240531_C000219349Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140194"
      unitRef="pure">0.0032</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140195"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140196"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140197"
      unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20240531_20240531_C000005531Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140198"
      unitRef="pure">0.0050</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20240531_20240531_C000219349Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140199"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140200"
      unitRef="pure">0.0022</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140201"
      unitRef="pure">0.0004</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140202"
      unitRef="pure">0.0072</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="Context_20240531_20240531_C000005531Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140203"
      unitRef="pure">0.0044</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="Context_20240531_20240531_C000219349Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140204"
      unitRef="pure">0</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140205"
      unitRef="pure">0.0054</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140206"
      unitRef="pure">0.0036</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140207"
      unitRef="pure">0.0129</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="Context_20240531_20240531_C000005531Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140208"
      unitRef="pure">0.0126</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="Context_20240531_20240531_C000219349Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140209"
      unitRef="pure">0.0032</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="_42_"
      unitRef="pure">-0.0010</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140211"
      unitRef="pure">0</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="_44_"
      unitRef="pure">-0.0037</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20240531_20240531_C000005531Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="_45_"
      unitRef="pure">-0.0018</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20240531_20240531_C000219349Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="_46_"
      unitRef="pure">-0.0032</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="_47_"
      unitRef="pure">0.0044</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140216"
      unitRef="pure">0.0036</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="_49_"
      unitRef="pure">0.0092</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="Context_20240531_20240531_C000005531Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="_50_"
      unitRef="pure">0.0108</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="Context_20240531_20240531_C000219349Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="_51_"
      unitRef="pure">0.0000</rr:NetExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140220">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140221">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, that your investment has a 5% return
each year, and that the fund&#x2019;s operating expenses remain the same. The example also assumes that any
current expense limitation arrangement remains in place for the period noted in the previous table; therefore,
the figures have been adjusted to reflect fee waivers or expense reimbursements only in the periods for
which the expense limitation arrangement is expected to continue. Although your actual costs may be higher
or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140222"
      unitRef="usd">45</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140223"
      unitRef="usd">161</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140224"
      unitRef="usd">290</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140225"
      unitRef="usd">666</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140226"
      unitRef="usd">37</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140227"
      unitRef="usd">116</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140228"
      unitRef="usd">202</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140229"
      unitRef="usd">456</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140230"
      unitRef="usd">94</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140231"
      unitRef="usd">366</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140232"
      unitRef="usd">666</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140233"
      unitRef="usd">1518</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="Context_20240531_20240531_C000005531Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140234"
      unitRef="usd">110</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="Context_20240531_20240531_C000005531Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140235"
      unitRef="usd">379</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="Context_20240531_20240531_C000005531Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140236"
      unitRef="usd">671</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="Context_20240531_20240531_C000005531Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140237"
      unitRef="usd">1504</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="Context_20240531_20240531_C000219349Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140238"
      unitRef="usd">0</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="Context_20240531_20240531_C000219349Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140239"
      unitRef="usd">0</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="Context_20240531_20240531_C000219349Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140240"
      unitRef="usd">0</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="Context_20240531_20240531_C000219349Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140241"
      unitRef="usd">0</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-1034">&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:bold; text-decoration:none;"&gt;Portfolio Turnover  The fund pays transaction
costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio). A
higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when
the fund&#x2019;s shares &lt;/p&gt;

&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:bold; text-decoration:none;"&gt;are
held in a taxable account. These costs, which are not reflected in annual fund operating expenses or
in the example, affect the fund&#x2019;s performance. During the most recent fiscal year, the fund&#x2019;s portfolio
turnover rate was 179.3% of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverHeading
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140242">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverRate
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140243"
      unitRef="pure">1.793</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140244">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-1053">&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The fund invests at least
80% of its net assets in income-producing securities, which may include, but are not limited to, U.S.
government and agency obligations, mortgage- and asset-backed securities (including commercial mortgage-backed
securities), corporate bonds, foreign bonds, and Treasury Inflation Protected Securities. For purposes
of this 80% policy, the fund includes derivative instruments that are linked to, or provide investment
exposure to, income-producing securities.&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Over the long term, the fund seeks to achieve its objective
by investing primarily in income-producing securities that possess what the fund believes are favorable
total return (income plus increases in principal value) characteristics.&lt;/p&gt;&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Eighty percent (80%) of
the debt securities purchased by the fund are rated investment grade (i.e., rated in one of the four
highest rating categories) by each of the credit rating agencies (S&amp;amp;P Global Ratings, Moody&#x2019;s,
and Fitch) that have assigned a rating to the security or, if unrated, deemed by the adviser to be of
investment-grade quality. Up to 15% of the fund&#x2019;s net assets may be invested in &#x201c;split-rated securities,&#x201d;
which are securities that have been rated investment grade by at least one credit rating agency but below
investment grade by another credit rating agency. The fund may maintain a net exposure of up to 5% of
its net assets in instruments (through direct holdings and derivatives) that have received below investment-grade
ratings from each of the credit rating agencies that have assigned ratings to the instruments or, if
unrated, deemed by the adviser to be below investment-grade quality (including high yield or &#x201c;junk&#x201d;
bonds). The fund may invest up to 20% of its net assets in non-U.S. dollar-denominated foreign debt securities
(including securities of issuers in emerging markets) and take currency positions to hedge this exposure
as well as to capture appreciation from favorable currency changes.&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The fund has considerable
flexibility in seeking high income. There are no maturity restrictions so the fund can purchase long-term
bonds, which tend to have higher yields than shorter-term bonds. In addition, when there is a large yield
difference between the various quality levels, the fund may move down the credit scale and purchase lower-rated
bonds with higher yields. When the difference is small or the outlook warrants, the fund may concentrate
investments in higher-rated issues.&lt;/p&gt;&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The fund may use a variety of derivatives, such as futures,
forwards, and swaps for a number of purposes, such as for exposure or hedging. Specifically, the fund
uses interest rate futures, interest rate future options, interest rate swaptions, forward currency exchange
contracts, credit default swaps, credit default swap indexes (CDX), and mortgage-backed securities on
a delayed delivery or forward commitment basis through the &#x201c;to-be-announced&#x201d; (TBA) market as a means
of adjusting the fund&#x2019;s duration and gaining exposure to investment-grade bonds.&lt;/p&gt;

&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The
fund buys or sells credit default swaps in order to generate returns, adjust the fund&#x2019;s overall credit
quality, or protect the value of certain portfolio holdings, as well as to profit from expected deterioration
in the credit quality of an issuer or the widening of credit spreads. CDXs are primarily used to hedge
the portfolio&#x2019;s overall credit risk or to efficiently gain exposure to certain sectors or asset classes
(such as high yield bonds). Interest rate futures and interest rate future options are primarily used
to manage the fund&#x2019;s exposure to interest rate changes and limit overall volatility by adjusting the
portfolio&#x2019;s duration and extending or shortening the overall maturity of the fund. Interest rate swaptions
would typically be used to manage the fund&#x2019;s exposure to interest rate changes or to adjust portfolio
duration. Forward currency exchange contracts may be used to limit overall volatility by protecting the
fund&#x2019;s non-U.S. dollar-denominated holdings from adverse currency movements relative to the U.S. dollar
or to generate returns by gaining long or short exposure to certain currencies expected to increase or
decrease in value relative to other currencies.&lt;/p&gt;&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The fund may also purchase or sell mortgage-backed securities
on a delayed delivery or forward commitment basis through the &#x201c;to-be-announced&#x201d; (TBA) market. With
TBA transactions, the particular securities to be delivered are not identified at the trade date, but
the delivered securities must meet specified terms and standards. The fund will generally enter into
TBA transactions with the intention of taking possession of the underlying mortgage-backed securities.
However, in an effort to obtain underlying mortgage-backed securities on more preferable terms or to
enhance returns, the fund may extend the settlement by entering into &#x201c;dollar roll&#x201d; transactions in
which the fund sells mortgage-backed securities to a dealer and simultaneously agrees to purchase substantially
similar securities in the future at a predetermined price. The fund also expects to engage in short sales
of TBA mortgages, including short sales on TBA mortgages the fund does not own, to potentially enhance
returns or manage risk. &lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140245">Principal Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_RiskLoseMoneyMember_S000002136Summary1Member"
      id="ixv-140246"> The fund&#x2019;s share price fluctuates, which means you could lose
money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Fixedincomemarkets_S000002136Summary1Member"
      id="ixv-1077">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Fixed income markets:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;Economic and other market
developments can adversely affect the fixed income securities markets. &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;At times, participants
in these markets may develop concerns about the ability of certain issuers of debt instruments to make
timely principal and interest payments, or they may develop concerns about the ability of financial institutions
that make markets in certain debt instruments to facilitate an orderly market. Those concerns could cause
increased volatility and reduced liquidity in particular securities or in the overall fixed income markets
and the related derivatives markets. A lack of liquidity or other adverse credit market conditions may
hamper the fund&#x2019;s ability to sell the debt instruments in which it invests or to find and purchase
suitable debt instruments.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Marketconditions_S000002136Summary1Member"
      id="ixv-1083">&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Market conditions:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The value of the fund&#x2019;s investments
may decrease, sometimes rapidly or unexpectedly, due to factors affecting an issuer held by the fund,
particular industries, or the &lt;/span&gt;&lt;/p&gt;

&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;overall
securities markets. A variety of factors can increase the volatility of the fund&#x2019;s holdings and markets
generally, including economic, political, or regulatory developments, recessions, inflation, rapid interest
rate changes, war, military conflict, acts of terrorism, natural disasters, and outbreaks of infectious
illnesses or other widespread public health issues (such as the coronavirus pandemic) and related governmental
and public responses (including sanctions). Certain events may cause instability across global markets,
including reduced liquidity and disruptions in trading markets, while some events may affect certain
geographic regions, countries, sectors, and industries more significantly than others. Government intervention
in markets may impact interest rates, market volatility, and security pricing. These adverse developments
may cause broad declines in market value due to short-term market movements or for significantly longer
periods during more prolonged market downturns.&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Interestrates_S000002136Summary1Member"
      id="ixv-1102">&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Interest rates:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;A rise in interest rates
typically causes the price of a fixed rate debt instrument to fall and its yield to rise. Conversely,
a decline in interest rates typically causes the price of a fixed rate debt instrument to rise and the
yield to fall. The prices and yields of inflation-linked bonds are directly impacted by the rate of inflation
as well as changes in interest rates. Generally, funds with longer weighted average maturities and durations
carry greater interest rate risk. Changes in monetary policy made by central banks and/or governments
are likely to affect the interest rates or yields of the securities in which the fund invests.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Prepaymentsandextensions_S000002136Summary1Member"
      id="ixv-1107">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Prepayments
and extensions:  &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The fund is subject to prepayment risks because the principal on mortgage-backed
securities, asset-backed securities, or any debt instrument with an embedded call option may be prepaid
at any time, which could reduce the security&#x2019;s yield and market value. The rate of prepayments tends
to increase as interest rates fall, which could cause the average maturity of the portfolio to shorten.
Extension risk may result from a rise in interest rates, which tends to make mortgage-backed securities,
asset-backed securities, and other callable debt instruments more volatile.&lt;/span&gt;&lt;/p&gt;&lt;span style="-sec-ix-redline:true;"&gt;&#160;&lt;/span&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_TBAsanddollarrolls_S000002136Summary1Member"
      id="ixv-1112">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;TBAs
and dollar rolls:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Although the securities that are delivered in TBA transactions must meet certain
standards, there is a risk that the actual securities received by the fund may be less favorable than
what was anticipated when entering into the transaction. TBA transactions are collateralized but they
still involve the risk that a counterparty will fail to deliver the security, exposing the fund to potential
losses. Whether or not the fund takes delivery of the securities at the termination date of a TBA transaction,
it will nonetheless be exposed to changes in the value of the underlying investments during the term
of the agreement. Forward settling securities, such as TBAs, involve leverage which may magnify investment
risks and can cause losses to be realized more quickly. In addition, the fund&#x2019;s portfolio turnover
rate and transaction costs are increased when the fund enters into dollar roll transactions.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Derivatives_S000002136Summary1Member"
      id="ixv-1116">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Derivatives:
 &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The
use of derivatives exposes the fund to additional volatility and potential losses. A derivative involves
risks different from, and possibly greater than, the risks associated with investing directly in the
assets on which the derivative is based, including liquidity risk, valuation risk, correlation risk,
market risk, interest rate risk, leverage risk, counterparty and credit risk, operational risk, management
risk, legal risk, and regulatory risk. Derivatives can be highly volatile, illiquid, and difficult to
value, and changes in the value of a derivative may not properly &lt;/span&gt;&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;correlate
with changes in the value of the underlying asset, reference rate, or index. The fund could be exposed
to significant losses if it is unable to close a derivatives position due to the lack of a liquid secondary
trading market. The prices of derivatives may move in unexpected ways, especially in abnormal market
conditions. Certain derivatives are also subject to counterparty risk, which is the risk that the derivative
counterparty will not fulfill its contractual obligations. The use of derivatives includes the risk of
potential operational issues, such as settlement issues. Derivatives are exposed to legal risks, such
as the legality or enforceability of a contract. The adviser may not be able to accurately predict the
direction of prices, economic factors, or other associated risks which could cause loss in value or impair
the fund&#x2019;s efforts to reduce overall volatility. New regulations may make derivatives more costly,
limit availability, or otherwise affect their value or performance.&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Foreigninvesting_S000002136Summary1Member"
      id="ixv-1135">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Foreign investing:  &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;Investments in the securities
of non-U.S. issuers may be adversely affected by local, political, social, and economic conditions overseas;
greater volatility; reduced liquidity; or decreases in foreign currency values relative to the U.S. dollar.
The risks of investing outside the U.S. are heightened for any investments in emerging markets, which
are susceptible to greater volatility than investments in developed markets.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Creditquality_S000002136Summary1Member"
      id="ixv-1139">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Credit quality:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;
 An issuer of a debt instrument could suffer an adverse change in financial condition that results in
a payment default (failure to make scheduled interest or principal payments), rating downgrade, or inability
to meet a financial obligation. Securities that are rated below investment grade carry greater risk of
default and should be considered speculative.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Liquidity_S000002136Summary1Member"
      id="ixv-1143">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The fund may not be
able to meet requests to redeem shares issued by the fund without significant dilution of the remaining
shareholders&#x2019; interests in the fund. In addition, the fund may not be able to sell a holding in a timely
manner at a desired price. Reduced liquidity in the bond markets can result from a number of events,
such as limited trading activity, reductions in bond inventory, and rapid or unexpected changes in interest
rates. Markets with lower overall liquidity could lead to greater price volatility and limit the fund&#x2019;s
ability to sell a holding at a suitable price.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Portfolioturnover_S000002136Summary1Member"
      id="ixv-1147">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Portfolio turnover:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  High portfolio turnover
may adversely affect the fund&#x2019;s performance and increase transaction costs, which could increase the
fund&#x2019;s expenses. High portfolio turnover may also result in the distribution of higher capital gains
when compared with a fund with less active trading policies, which could have an adverse tax impact if
the fund&#x2019;s shares are held in a taxable account. &lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Activemanagement_S000002136Summary1Member"
      id="ixv-1151">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Active management:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The fund&#x2019;s overall
investment program and holdings selected by the fund&#x2019;s investment adviser may underperform the broad
markets, relevant indices, or other funds with similar objectives and investment strategies.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_Cybersecuritybreaches_S000002136Summary1Member"
      id="ixv-1155">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Cybersecurity
breaches:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The fund could be harmed by intentional cyberattacks and other cybersecurity
breaches, including unauthorized access to the fund&#x2019;s assets, confidential information, or other proprietary
information. In addition, a cybersecurity breach could cause one of the fund&#x2019;s service providers or
financial intermediaries to suffer unauthorized data access, data corruption, or loss of operational
functionality.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140247">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-1173">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The
following performance information provides some indication of the risks of investing in the fund. The
fund&#x2019;s performance information represents only past performance (before and after taxes) and is not
necessarily an indication of future results.&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The following bar chart illustrates how much returns can differ
from year to year by showing calendar year returns and the best and worst calendar quarter returns during
those &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;years for the fund&#x2019;s Investor Class. Returns for other share classes vary since
they have different expenses.&lt;/span&gt;&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140248">The
following performance information provides some indication of the risks of investing in the fund. The following bar chart illustrates how much returns can differ
from year to year by showing calendar year returns and the best and worst calendar quarter returns during
those  years for the fund&#x2019;s Investor Class. Returns for other share classes vary since
they have different expenses. The following table shows the average annual
total returns for each class of the fund that has been in operation for at least one full calendar year.
The fund&#x2019;s performance information included in the table is compared with a regulatory required index
that represents an overall securities market (Regulatory Benchmark). In addition, the table may also
include one or more indexes that more closely aligns to the fund&#x2019;s investment strategy (Strategy Benchmark(s)).</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140249"> The
fund&#x2019;s performance information represents only past performance (before and after taxes) and is not
necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140250">Calendar Year Returns</rr:BarChartHeading>
    <rr:BarChartClosingTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-1190">&lt;table cellpadding="0" cellspacing="0" style="-sec-ix-redline:true;border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:9.02%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.01%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.99%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:13%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:.49%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.99%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.99%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:13%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:5.5%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="font-size:8.0pt; font-family:Sans-Serif; text-align:center; font-weight:normal; text-decoration:none;"&gt;Quarter Ended&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="font-size:8.0pt; font-family:Sans-Serif; text-align:center; font-weight:normal; text-decoration:none;"&gt;Total Return&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="font-size:8.0pt; font-family:Sans-Serif; text-align:center; font-weight:normal; text-decoration:none;"&gt;Quarter Ended&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="font-size:8.0pt; font-family:Sans-Serif; text-align:center; font-weight:normal; text-decoration:none;"&gt;Total Return&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Sans-Serif; text-align:center; font-weight:normal; text-decoration:none;"&gt;Best
Quarter&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Sans-Serif; text-align:center; font-weight:normal; text-decoration:none;"&gt;12/31/23&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Sans-Serif; text-align:center; font-weight:normal; text-decoration:none;"&gt;6.29%&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Sans-Serif; text-align:center; font-weight:normal; text-decoration:none;"&gt;Worst Quarter&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Sans-Serif; text-align:center; font-weight:normal; text-decoration:none;"&gt;3/31/22&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Sans-Serif; text-align:center; font-weight:normal; text-decoration:none;"&gt;-5.79%&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
    <rr:HighestQuarterlyReturnLabel
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      id="ixv-140251">Best
Quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      id="ixv-140252">2023-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140253"
      unitRef="pure">0.0629</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      id="ixv-140254">Worst Quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      id="ixv-140255">2022-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140256"
      unitRef="pure">-0.0579</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartFootnotesTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-1232">&lt;p style="-sec-ix-redline:true;font-size:7.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;The
fund&#x2019;s return for the six months ended 6/30/24 was -0.67%.&lt;/p&gt;</rr:BarChartFootnotesTextBlock>
    <rr:YearToDateReturnLabel
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      id="ixv-140257">The
fund&#x2019;s return for the six months ended</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      id="ixv-140258">2024-06-30</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140259"
      unitRef="pure">-0.0067</rr:BarChartYearToDateReturn>
    <rr:PerformanceTableNarrativeTextBlock
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-1234">&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following table shows the average annual
total returns for each class of the fund that has been in operation for at least one full calendar year.
The fund&#x2019;s performance information included in the table is compared with a regulatory required index
that represents an overall securities market (Regulatory Benchmark). In addition, the table may also
include one or more indexes that more closely aligns to the fund&#x2019;s investment strategy (Strategy Benchmark(s)).&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;In
addition, the table shows hypothetical after-tax returns to demonstrate how taxes paid by a shareholder
may influence returns. After-tax returns are calculated using the historical highest individual federal
marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns
depend on an investor&#x2019;s tax situation and may differ from those shown. After-tax returns shown are
not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k)
account or an IRA. After-tax returns are shown only for the Investor Class and will differ for other
share classes.&lt;/p&gt;</rr:PerformanceTableNarrativeTextBlock>
    <rr:PerformanceTableUsesHighestFederalRate
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140260"> After-tax returns are calculated using the historical highest individual federal
marginal income tax rates and do not reflect the impact of state and local taxes.</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableNotRelevantToTaxDeferred
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140261"> Actual after-tax returns
depend on an investor&#x2019;s tax situation and may differ from those shown. After-tax returns shown are
not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k)
account or an IRA.</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableOneClassOfAfterTaxShown
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140262">After-tax returns are shown only for the Investor Class and will differ for other
share classes.</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableHeading
      contextRef="Context_20240531_20240531_S000002136Member_S000002136Summary1Member"
      id="ixv-140263">Average
Annual Total Returns Periods
ended December 31, 2023</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnInceptionDate
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      id="ixv-140264">1973-08-31</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnYear01
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140265"
      unitRef="pure">0.0472</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140266"
      unitRef="pure">0.0060</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140267"
      unitRef="pure">0.0148</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="Context_20240531_20240531_AfterTaxesOnDistributionsMember_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140268"
      unitRef="pure">0.0308</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="Context_20240531_20240531_AfterTaxesOnDistributionsMember_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140269"
      unitRef="pure">-0.0057</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="Context_20240531_20240531_AfterTaxesOnDistributionsMember_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140270"
      unitRef="pure">0.0031</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="Context_20240531_20240531_AfterTaxesOnDistributionsAndSalesMember_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140271"
      unitRef="pure">0.0276</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="Context_20240531_20240531_AfterTaxesOnDistributionsAndSalesMember_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140272"
      unitRef="pure">0.0003</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="Context_20240531_20240531_AfterTaxesOnDistributionsAndSalesMember_C000005529Member_S000002136Member_S000002136Summary1Member"
      decimals="INF"
      id="ixv-140273"
      unitRef="pure">0.0066</rr:AverageAnnualReturnYear10>
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      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
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      contextRef="Context_20240531_20240531_C000159679Member_S000002136Member_S000002136Summary1Member"
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    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20240531_20240531_C000005529Member_S000002136Member_S000002136Summary1Member"
      id="ixv-140604">September
30, 2025</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
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      contextRef="Context_20240531_20240531_C000005530Member_S000002136Member_S000002136Summary1Member"
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30, 2025</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
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      contextRef="Context_20240531_20240531_C000005531Member_S000002136Member_S000002136Summary1Member"
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30, 2025</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
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    <link:footnoteLink
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        <link:footnote id="fn1_" xlink:label="fn1_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; text-align:left; font-weight:normal; text-decoration:none;">Subject
to certain exceptions and account minimums, accounts are charged an annual $20 fee.</xhtml:p></link:footnote>
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        <link:footnote id="fn2_" xlink:label="fn2_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; text-align:left; font-weight:normal; text-decoration:none;">T.
Rowe Price Associates, Inc., has contractually agreed (through September 30, 2025) to waive its fees
and/or bear any expenses (excluding interest; expenses related to borrowings, taxes, and brokerage; nonrecurring,
extraordinary expenses; and acquired fund fees and expenses) that would cause the class&#x2019; ratio of expenses
to average daily net assets to exceed 0.44%. The agreement may only be terminated at any time after September
30, 2025, with approval by the fund&#x2019;s Board of Directors. Fees waived and expenses paid under this
agreement (and any applicable prior limitations) are subject to reimbursement to T. Rowe Price Associates,
Inc., by the class whenever the class&#x2019; expense ratio is below 0.44%. However, the class will not reimburse
T. Rowe Price Associates, Inc., more than three years from the date such amounts were initially waived
or paid. The class may only reimburse T. Rowe Price Associates, Inc., if the reimbursement does not cause
the class&#x2019; expense ratio (after the reimbursement is taken into account) to exceed the class&#x2019; current
expense limitation (or the expense limitation in place at the time the amounts were waived or paid).</xhtml:p></link:footnote>
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Rowe Price Associates, Inc., has contractually agreed (through September 30, 2025) to waive its fees
and/or bear any expenses (excluding interest; expenses related to borrowings, taxes, and brokerage; nonrecurring,
extraordinary expenses; and acquired fund fees and expenses) that would cause the class&#x2019; ratio of expenses
to average daily net assets to exceed 0.92%. The agreement may only be terminated at any time after September
30, 2025, with approval by the fund&#x2019;s Board of Directors. Fees waived and expenses paid under this
agreement (and any applicable prior limitations) are subject to reimbursement to T. Rowe Price Associates,
Inc., by the class whenever the class&#x2019; expense ratio is below 0.92%. However, the class will not reimburse
T. Rowe Price Associates, Inc., more than three years from the date such amounts were initially waived
or paid. The class may only reimburse T. Rowe Price Associates, Inc., if the reimbursement does not cause
the class&#x2019; expense ratio (after the reimbursement is taken into account) to exceed the class&#x2019; current
expense limitation (or the expense limitation in place at the time the amounts were waived or paid).</xhtml:p></link:footnote>
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Rowe Price Associates, Inc., has contractually agreed (through September 30, 2025) to waive its fees
and/or bear any expenses (excluding interest; expenses related to borrowings, taxes, and brokerage; nonrecurring,
extraordinary expenses; and acquired fund fees and expenses) that would cause the class&#x2019; ratio of expenses
to average daily net assets to exceed 1.08%. The agreement may only be terminated at any time after September
30, 2025, with approval by the fund&#x2019;s Board of Directors. Fees waived and expenses paid under this
agreement (and any applicable prior limitations) are subject to reimbursement to T. Rowe Price Associates,
Inc., by the class whenever the class&#x2019; expense ratio is below 1.08%. However, the class will not reimburse
T. Rowe Price Associates, Inc., more than three years from the date such amounts were initially waived
or paid. The class may only reimburse T. Rowe Price Associates, Inc., if the reimbursement does not cause
the class&#x2019; expense ratio (after the reimbursement is taken into account) to exceed the class&#x2019; current
expense limitation (or the expense limitation in place at the time the amounts were waived or paid).</xhtml:p></link:footnote>
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Rowe Price Associates, Inc., has contractually agreed to waive and/or bear all the Z Class&#x2019; expenses
(excluding interest; expenses related to borrowings, taxes, and brokerage; nonrecurring, extraordinary
expenses; and acquired fund fees and expenses) in their entirety. T. Rowe Price Associates, Inc., expects
this fee waiver and/or expense reimbursement arrangement to remain in place indefinitely, and the agreement
may only be amended or terminated with approval by the fund&#x2019;s Board of Directors.</xhtml:p></link:footnote>
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to new SEC Rules on shareholder reporting, the fund adopted a new broad-based securities market index,
referred to as the Regulatory Benchmark.</xhtml:span></link:footnote>
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        <link:footnote id="fn8_" xlink:label="fn8_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;">Return since 3/16/20.</xhtml:span></link:footnote>
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          xlink:href="#_167_"
          xlink:label="_167_"
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        <link:footnote id="fn9_" xlink:label="fn9_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;">Return since 8/31/15.</xhtml:span></link:footnote>
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