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Significant Accounting Policies - Creations and Redemptions of Shares (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Activity in Number of Shares Created and Redeemed:
Creations			66,800	50,500
Redemptions			(50,400)	(35,700)
Net Change in Number of Shares Created and Redeemed			16,400	14,800
Activity in Value of Shares Created and Redeemed:
Creations	$ 8,555,872	$ 2,820,652	$ 9,938,241	$ 6,027,193
Redemptions	$ (4,620,586)	$ (2,959,784)	(7,254,854)	(4,324,677)
Net Change in Value of Shares Created and Redeemed			$ 2,683,387	$ 1,702,516

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