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Significant Accounting Policies - Summary of Trust's Investments at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Investment Holdings [Line Items]
Investment in Gold	$ 36,013,428	$ 35,669,225
Level 1 [Member]
Investment Holdings [Line Items]
Investment in Gold	36,013,428	35,669,225
Level 1 [Member] | Investment in Gold [Member]
Investment Holdings [Line Items]
Investment in Gold	36,013,428	35,669,225
Level 2 [Member]
Investment Holdings [Line Items]
Investment in Gold	0	0
Level 2 [Member] | Investment in Gold [Member]
Investment Holdings [Line Items]
Investment in Gold	0	0
Level 3 [Member]
Investment Holdings [Line Items]
Investment in Gold	0	0
Level 3 [Member] | Investment in Gold [Member]
Investment Holdings [Line Items]
Investment in Gold	$ 0	$ 0

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- Definition

Fair value of investment held in physical commodities, for example, but not limited to, gold, silver, platinum, crude oil, coal, sugar, rice, wheat.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

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