Average Annual Total Returns - FidelityMagellanFund-KPRO - FidelityMagellanFund-KPRO - Fidelity Magellan Fund	May 30, 2023
Fidelity Magellan Fund - Class K \| Return Before Taxes
Average Annual Return:
Past 1 year	(27.08%)
Past 5 years	8.08%
Past 10 years	12.23%
SP001
Average Annual Return:
Past 1 year	(18.11%)
Past 5 years	9.42%
Past 10 years	12.56%

Return Before Taxes.

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 iii
-Clause 1
-Exhibit 2

Name:	rr_AverageAnnualReturnYear01
Namespace Prefix:	rr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration