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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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