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Significant Accounting Policies - Creations and Redemptions of Shares (Detail)
$ in Thousands
 9 Months Ended
Jun. 30, 2017
USD ($)
shares
Activity in Number of Shares Issued and Outstanding:  
Creations | shares 220,000
Redemptions | shares 0
Net change in number of Shares Issued and Outstanding | shares 220,000
Activity in Value of Shares Issued and Outstanding:  
Creations | $ $ 26,550 [1]
Redemptions | $ 0
Net change in value of Shares Issued and Outstanding | $ $ 26,550
SPDR Long Dollar Gold Trust [Member]  
Activity in Number of Shares Issued and Outstanding:  
Creations | shares 220,000
Redemptions | shares 0
Net change in number of Shares Issued and Outstanding | shares 220,000
Activity in Value of Shares Issued and Outstanding:  
Creations | $ $ 26,550 [1]
Redemptions | $ 0
Net change in value of Shares Issued and Outstanding | $ $ 26,550
[1] No comparative has been provided as operations commenced on January 27, 2017. See Note 1.