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Significant Accounting Policies - Creations and Redemptions of Shares (Detail) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 27, 2017 | Mar. 31, 2018 | Sep. 30, 2017
Activity in Number of Shares Issued and Outstanding: |  |  |
Creations | 10 | 40,000 | 220,000
Redemptions |  | (20,000) | (100,000)
Net change in number of Shares Issued and Outstanding |  | 20,000 | 120,000
Activity in Value of Shares Issued and Outstanding: |  |  |
Creations |  | $ 4,814 | $ 26,550
Redemptions |  | (2,393) | (11,840)
Net change in value of Shares Issued and Outstanding |  | $ 2,421 | $ 14,710
SPDR Long Dollar Gold Trust [Member] |  |  |
Activity in Number of Shares Issued and Outstanding: |  |  |
Creations | 10 | 40,000 | 220,000
Redemptions |  | (20,000) | (100,000)
Net change in number of Shares Issued and Outstanding |  | 20,000 | 120,000
Activity in Value of Shares Issued and Outstanding: |  |  |
Creations |  | $ 4,814 | $ 26,550
Redemptions |  | (2,393) | (11,840)
Net change in value of Shares Issued and Outstanding |  | $ 2,421 | $ 14,710

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- Definition Number of new stock issued during the period. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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