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General - Additional Information (Detail)	Sep. 30, 2015
Minimum [Member]
Investment Holdings [Line Items]
Individual investments percent of net assets available for benefits	5.00%

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Period Type:	duration

X

- Definition

Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 946



-SubTopic 320



-Section S99



-Paragraph 1



-Subparagraph (SX 210.12-12.3)



-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 946



-SubTopic 320



-Section S99



-Paragraph 4



-Subparagraph (SX 210.12-12C.Column D.2)



-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

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Balance Type:	na
Period Type:	instant

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