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Marketable Securities - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Marketable Securities [Abstract]
Net unrealized gains (losses)	$ (159,000)us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities	$ 210,000us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities	$ (820,000)us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities	$ 704,000us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities
Transfers of investments between Level 1 and Level 2	$ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount	$ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount	$ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount	$ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount

X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

The sum of the realized and unrealized net gain (loss) on trading securities during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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