Annual Total Returns - Fidelity Managed Retirement 2020 Fund [BarChart] - 07.31 Fidelity Managed Retirement Funds AI Combo PRO-15 - Fidelity Managed Retirement 2020 Fund - Fidelity Advisor Managed Retirement 2020 Fund-Class A	Sep. 29, 2021
Bar Chart Table:
Annual Return 2011	(1.95%)
Annual Return 2012	12.63%
Annual Return 2013	17.35%
Annual Return 2014	5.53%
Annual Return 2015	(0.24%)
Annual Return 2016	6.80%
Annual Return 2017	13.01%
Annual Return 2018	(4.69%)
Annual Return 2019	15.89%
Annual Return 2020	11.78%

Annual Total Returns - Fidelity Managed Retirement 2020 Fund [BarChart] - 07.31 Fidelity Managed Retirement Funds AI Combo PRO-15 - Fidelity Managed Retirement 2020 Fund - Fidelity Advisor Managed Retirement 2020 Fund-Class A

Sep. 29, 2021

(1.95%)

Annual Return 2012

12.63%

17.35%

5.53%

(0.24%)

6.80%

13.01%

(4.69%)

15.89%

11.78%

If the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form
-Number N-1A
-Chapter A
-Section 4
-Subsection b
-Paragraph 2
-Subparagraph instructions
-Clause 3
-Exhibit a

+ Details

Name:	rr_AnnualReturn2011
Namespace Prefix:	rr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

+ References