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Investment in Gold - Investment in Gold (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 oz | Sep. 30, 2012 oz | Sep. 30, 2011 oz
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Investment in Gold [Line Items] |  |  |
Gold receivable, Ounces of gold | 0 | 0 | 0
Gold payable, Ounces of gold | 115.9 | 339.3 | 321.2
Gold receivable | $ 0 | $ 0 | $ 0
Gold payable | $ 153,680 | $ 602,591 | $ 520,297

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

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- Definition Ounces of gold payable by the Trust. + References No definition available. + Details
Name: | gld_GoldPayableOuncesOfGold
Namespace Prefix: | gld_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

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- Definition Ounces of gold receivable by the Trust. + References No definition available. + Details
Name: | gld_GoldReceivableOuncesOfGold
Namespace Prefix: | gld_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | gld_InvestmentInGoldLineItems
Namespace Prefix: | gld_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
Name: | us-gaap_ReceivablesNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant