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Organization - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2012
Organization (Textual) [Abstract]
Minimum block of shares issued redeemed against gold	100,000

X

- Definition

The minimum block of shares that can be created or redeemed against gold deposits or distributions.

+ References

No definition available.

+ Details

Name:	gld_MinimumBlockOfSharesIssuedRedeemedAgainstGold
Namespace Prefix:	gld_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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