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Significant Accounting Policies - Gold Payable (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Gold Payable
Gold payable	$ 0	$ 0

X

- Definition

The total amount of gold due by the trust within one year of the balance sheet date in respect of the redemption of shares.

+ References

No definition available.

+ Details

Name:	gld_GoldPayable
Namespace Prefix:	gld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Gold Payable [Abstract]

+ References

No definition available.

+ Details

Name:	gld_GoldPayableAbstract
Namespace Prefix:	gld_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration