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Significant Accounting Policies - Summary of Fund's Investments at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Investment Holdings [Line Items]
Fund's investments at fair value	$ 5,094,532	$ 4,387,731
SPDR Gold Mini Shares Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	5,094,532	4,387,731
Investment in Gold [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	5,094,532	4,387,731
Investment in Gold [Member] | SPDR Gold Mini Shares Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	5,094,532	4,387,731
Fair Value, Inputs, Level 1 [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	5,094,532	4,387,731
Fair Value, Inputs, Level 1 [Member] | SPDR Gold Mini Shares Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	5,094,532	4,387,731
Fair Value, Inputs, Level 1 [Member] | Investment in Gold [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	5,094,532	4,387,731
Fair Value, Inputs, Level 1 [Member] | Investment in Gold [Member] | SPDR Gold Mini Shares Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	5,094,532	4,387,731
Fair Value, Inputs, Level 2 [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	0	0
Fair Value, Inputs, Level 2 [Member] | SPDR Gold Mini Shares Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Investment in Gold [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Investment in Gold [Member] | SPDR Gold Mini Shares Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	0	0
Fair Value, Inputs, Level 3 [Member] | SPDR Gold Mini Shares Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Investment in Gold [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Investment in Gold [Member] | SPDR Gold Mini Shares Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	$ 0	$ 0

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5D
-Subparagraph (SX 210.12-13D(Column C))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column C))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010

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