XML 9 R4.htm IDEA: XBRL DOCUMENT v2.3.0.11

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Jan. 31, 2011

The date of the prospectus.

Reference 1: 1
-Publisher SEC
-Name Form
-Number N-1A
-Chapter A
-Section 1
-Paragraph 3
-Subsection a

Name:	rr_ProspectusDate
Namespace Prefix:	rr
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

Name:	rr_RiskReturnAbstract
Namespace Prefix:	rr
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration