Expense Example, No Redemption (Vanguard Wellesley Income Fund, USD $)	12 Months Ended
Sep. 30, 2012
Vanguard Wellesley Income Fund - Investor Shares
Expense Example, No Redemption:
1 YEAR	$ 26
3 YEAR	80
5 YEAR	141
10 YEAR	318
Vanguard Wellesley Income Fund - Admiral Shares
Expense Example, No Redemption:
1 YEAR	18
3 YEAR	58
5 YEAR	101
10 YEAR	$ 230

Name:	rr_ExpenseExampleNoRedemptionAbstract
Namespace Prefix:	rr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

You would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.

+ References

Reference 1: 1

-Publisher SEC

-Name Form

-Number N-1A

-Chapter A

-Section 3

-Paragraph 2

-Subparagraph 1

-Subsection example

+ Details

Name:	rr_ExpenseExampleNoRedemptionYear01
Namespace Prefix:	rr_
Data Type:	rr:NonNegativeMonetaryType
Balance Type:	na
Period Type:	duration

- Definition

+ References

Reference 1: 1

-Publisher SEC

-Name Form

-Number N-1A

-Chapter A

-Section 3

-Paragraph 2

-Subparagraph 1

-Subsection example

+ Details

Name:	rr_ExpenseExampleNoRedemptionYear03
Namespace Prefix:	rr_
Data Type:	rr:NonNegativeMonetaryType
Balance Type:	na
Period Type:	duration

- Definition

+ References

Reference 1: 1

-Publisher SEC

-Name Form

-Number N-1A

-Chapter A

-Section 3

-Paragraph 4

-Subparagraph f

-Subsection instructions

+ Details

Name:	rr_ExpenseExampleNoRedemptionYear05
Namespace Prefix:	rr_
Data Type:	rr:NonNegativeMonetaryType
Balance Type:	na
Period Type:	duration

- Definition

+ References

Reference 1: 1

-Publisher SEC

-Name Form

-Number N-1A

-Chapter A

-Section 3

-Paragraph 4

-Subparagraph f

-Subsection instructions

+ Details

Name:	rr_ExpenseExampleNoRedemptionYear10
Namespace Prefix:	rr_
Data Type:	rr:NonNegativeMonetaryType
Balance Type:	na
Period Type:	duration