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Significant Accounting Policies - Creations and Redemptions of Shares (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015		Sep. 30, 2014	Sep. 30, 2013
Activity in Number of Shares Issued and Outstanding:
Creations	55,100,000		47,200,000	51,100,000
Redemptions	(81,700,000)		(91,500,000)	(187,400,000)
Net increase/(decrease) Shares Issued and Outstanding	(26,600,000)		(44,300,000)	(136,300,000)
Activity in Value of Shares Issued and Outstanding:
Creations	$ 6,447,849	[1]	$ 5,893,107	$ 7,734,465
Redemptions	(9,247,346)	[1]	(11,209,535)	(26,693,165)
Net increase/(decrease) Shares Issued and Outstanding	$ (2,799,497)		$ (5,316,428)	$ (18,958,700)
[1] Effective October 1, 2014, the Trust adopted the financial presentation provisions for an investment company. See note 2.2 to our audited financial statements.

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