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Significant Accounting Policies - Summary of Fund's Investments at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Investment Holdings [Line Items]
Fund's investments at fair value	$ 16,666	$ 14,406
SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	16,666	14,406
Investment in Gold [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	16,666	14,406
Investment in Gold [Member] | SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	16,666	14,406
Fair Value, Inputs, Level 1 [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	16,666	14,406
Fair Value, Inputs, Level 1 [Member] | SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	16,666	14,406
Fair Value, Inputs, Level 1 [Member] | Investment in Gold [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	16,666	14,406
Fair Value, Inputs, Level 1 [Member] | Investment in Gold [Member] | SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value	$ 16,666	14,406
Fair Value, Inputs, Level 1 [Member] | Gold Delivery Agreement [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 1 [Member] | Gold Delivery Agreement [Member] | SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 2 [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 2 [Member] | SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 2 [Member] | Investment in Gold [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 2 [Member] | Investment in Gold [Member] | SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 2 [Member] | Gold Delivery Agreement [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 2 [Member] | Gold Delivery Agreement [Member] | SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 3 [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 3 [Member] | SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 3 [Member] | Investment in Gold [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 3 [Member] | Investment in Gold [Member] | SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 3 [Member] | Gold Delivery Agreement [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		0
Fair Value, Inputs, Level 3 [Member] | Gold Delivery Agreement [Member] | SPDR Long Dollar Gold Trust [Member]
Investment Holdings [Line Items]
Fund's investments at fair value		$ 0

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No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=63488139&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12.Column C.3,4)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14.Column E.2,3)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-12C.Column C.7)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13.Column C.6)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010

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