Vanguard Target Retirement 2050 Fund Annual Fund Operating Expenses - Investor Prospectus [Member] - Vanguard Target Retirement 2050 Fund - Investor Shares	Sep. 30, 2025
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.00%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses (as a percentage of Assets):	0.00%
Acquired Fund Fees and Expenses	0.08%
Expenses (as a percentage of Assets)	0.08%

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 3
-Subparagraph f
-Sentence i

+ Details

Name:	oef_AcquiredFundFeesAndExpensesOverAssets
Namespace Prefix:	oef_
Data Type:	oef:nonNegativePure4ItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 3
-Subparagraph b

+ Details

Name:	oef_DistributionAndService12b1FeesOverAssets
Namespace Prefix:	oef_
Data Type:	oef:nonNegativePure4ItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 3
-Subparagraph d

+ Details

Name:	oef_ExpensesOverAssets
Namespace Prefix:	oef_
Data Type:	oef:nonNegativePure4ItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 3
-Subparagraph a

+ Details

Name:	oef_ManagementFeesOverAssets
Namespace Prefix:	oef_
Data Type:	oef:nonNegativePure4ItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 3
-Subparagraph c
-Sentence i

+ Details

Name:	oef_OtherExpensesOverAssets
Namespace Prefix:	oef_
Data Type:	oef:nonNegativePure4ItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 1
-Subsection a

+ Details

Name:	oef_ProspectusLineItems
Namespace Prefix:	oef_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_DocumentInformationDocumentAxis=chester_InvestorProspectusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=chester_S000012762Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	oef_ClassAxis=chester_C000034441Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: