EXPLANATORY NOTE
Attached for filing are exhibits containing interactive data format risk/return summary information that mirrors the risk/return summary information in the Prospectuses dated July 27, 2012 (as supplemented on May 23, 2013) filed under Rule 497(e) of the Securities Act of 1933, as amended, with the Securities and Exchange Commission on May 23, 2013 (Accession No. 0000740372-13-000059) with respect to the Institutional, Institutional Service, Investor, Investor Service and Retail Share classes of the U.S. Treasury Portfolio of Daily Income Fund.
| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Registrant Name | dei_EntityRegistrantName | DAILY INCOME FUND |
| Prospectus Date | rr_ProspectusDate | Jul. 27, 2012 |
| Document Creation Date | dei_DocumentCreationDate | May 23, 2013 |
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| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Registrant Name | dei_EntityRegistrantName | DAILY INCOME FUND |
| Prospectus Date | rr_ProspectusDate | Jul. 27, 2012 |
| Supplement [Text Block] | rtdif_SupplementTextBlock | U.S. Treasury Portfolio of Daily Income Fund Institutional Class, Institutional Service Class, Investor Class, Investor Service Class and Retail Class Shares SUPPLEMENT DATED MAY 23, 2013, TO THE SUMMARY PROSPECTUSES AND PROSPECTUSES, EACH DATED JULY 27, 2012 The purpose of this supplement is to inform you that the U.S. Treasury Portfolio of Daily Income Fund (the "Portfolio") has revised certain language concerning its investment strategy. The investment objective of the Portfolio has not changed. The following sections of the Prospectus are revised effective May 23, 2013. On page 2 of each Summary Prospectus and page 8 of each Prospectus, the first paragraph of "Principal Investment Strategies" should be replaced with the following: "The Daily Income Fund (the "Fund") seeks to maintain investment portfolios with a dollar-weighted average maturity of 60 days or less, to value its investment portfolios at amortized cost and maintain a net asset value of $1.00 per share. The U.S. Treasury Portfolio seeks to achieve its objective by investing at least 80% of the Portfolio's net assets (plus any borrowings for investment purposes) in U.S. Treasury Bills, U.S. Treasury Notes, and U.S. Treasury Bonds (collectively, "U.S. Treasury Obligations") with maturities of 397 days or less and repurchase agreements which are collateralized by U.S. Treasury Obligations. Up to 20% of the Portfolio's net assets may be invested in other United States Government obligations and repurchase agreements which are collateralized by such U.S. Government obligations. The Fund will provide shareholders with at least 60 days' prior notice of any change in this policy." On page 2 of each Summary Prospectus and Page 8 of each Prospectus, the last bullet point under "Principal Risks" should be replaced with the following: " • The U.S. Treasury Portfolio's investment policy of primarily investing in U.S. Treasury Obligations and repurchase agreements collateralized by U.S. Treasury Obligations, while minimizing risk of loss, may produce a lower yield than a policy of investing in other types of instruments. " |
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U.S. Treasury Portfolio
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| Risk/Return: | rr_RiskReturnAbstract | |
| Supplement [Text Block] | rtdif_SupplementTextBlock | U.S. Treasury Portfolio of Daily Income Fund Institutional Class, Institutional Service Class, Investor Class, Investor Service Class and Retail Class Shares SUPPLEMENT DATED MAY 23, 2013, TO THE SUMMARY PROSPECTUSES AND PROSPECTUSES, EACH DATED JULY 27, 2012 The purpose of this supplement is to inform you that the U.S. Treasury Portfolio of Daily Income Fund (the "Portfolio") has revised certain language concerning its investment strategy. The investment objective of the Portfolio has not changed. The following sections of the Prospectus are revised effective May 23, 2013. On page 2 of each Summary Prospectus and page 8 of each Prospectus, the first paragraph of "Principal Investment Strategies" should be replaced with the following: "The Daily Income Fund (the "Fund") seeks to maintain investment portfolios with a dollar-weighted average maturity of 60 days or less, to value its investment portfolios at amortized cost and maintain a net asset value of $1.00 per share. The U.S. Treasury Portfolio seeks to achieve its objective by investing at least 80% of the Portfolio's net assets (plus any borrowings for investment purposes) in U.S. Treasury Bills, U.S. Treasury Notes, and U.S. Treasury Bonds (collectively, "U.S. Treasury Obligations") with maturities of 397 days or less and repurchase agreements which are collateralized by U.S. Treasury Obligations. Up to 20% of the Portfolio's net assets may be invested in other United States Government obligations and repurchase agreements which are collateralized by such U.S. Government obligations. The Fund will provide shareholders with at least 60 days' prior notice of any change in this policy." On page 2 of each Summary Prospectus and Page 8 of each Prospectus, the last bullet point under "Principal Risks" should be replaced with the following: " • The U.S. Treasury Portfolio's investment policy of primarily investing in U.S. Treasury Obligations and repurchase agreements collateralized by U.S. Treasury Obligations, while minimizing risk of loss, may produce a lower yield than a policy of investing in other types of instruments. " |
U.S. Treasury Portfolio of Daily Income Fund Institutional Class, Institutional Service Class, Investor Class, Investor Service Class and Retail Class Shares SUPPLEMENT DATED MAY 23, 2013, TO THE SUMMARY PROSPECTUSES AND PROSPECTUSES, EACH DATED JULY 27, 2012 The purpose of this supplement is to inform you that the U.S. Treasury Portfolio of Daily Income Fund (the "Portfolio") has revised certain language concerning its investment strategy. The investment objective of the Portfolio has not changed. The following sections of the Prospectus are revised effective May 23, 2013. On page 2 of each Summary Prospectus and page 8 of each Prospectus, the first paragraph of "Principal Investment Strategies" should be replaced with the following: "The Daily Income Fund (the "Fund") seeks to maintain investment portfolios with a dollar-weighted average maturity of 60 days or less, to value its investment portfolios at amortized cost and maintain a net asset value of $1.00 per share. The U.S. Treasury Portfolio seeks to achieve its objective by investing at least 80% of the Portfolio's net assets (plus any borrowings for investment purposes) in U.S. Treasury Bills, U.S. Treasury Notes, and U.S. Treasury Bonds (collectively, "U.S. Treasury Obligations") with maturities of 397 days or less and repurchase agreements which are collateralized by U.S. Treasury Obligations. Up to 20% of the Portfolio's net assets may be invested in other United States Government obligations and repurchase agreements which are collateralized by such U.S. Government obligations. The Fund will provide shareholders with at least 60 days' prior notice of any change in this policy." On page 2 of each Summary Prospectus and Page 8 of each Prospectus, the last bullet point under "Principal Risks" should be replaced with the following: " • The U.S. Treasury Portfolio's investment policy of primarily investing in U.S. Treasury Obligations and repurchase agreements collateralized by U.S. Treasury Obligations, while minimizing risk of loss, may produce a lower yield than a policy of investing in other types of instruments. " |
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Document and Entity Information
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12 Months Ended |
|---|---|
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Jul. 27, 2012
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| Risk/Return: | |
| Document Type | Other |
| Document Period End Date | Mar. 31, 2012 |
| Registrant Name | DAILY INCOME FUND |
| Central Index Key | 0000918267 |
| Amendment Flag | false |
| Document Creation Date | May 23, 2013 |
| Document Effective Date | May 23, 2013 |
| Prospectus Date | Jul. 27, 2012 |