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Organization - Additional Information (Detail)	6 Months Ended
	Mar. 31, 2018 shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Formation date	Nov. 12, 2004
Minimum denomination of shares issued redeemed against gold	100,000

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- Definition

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

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No definition available.

+ Details

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- Definition

Trust Formation Date

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No definition available.

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Namespace Prefix:	gld_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

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No definition available.

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Namespace Prefix:	us-gaap_
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