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Financial Highlights - Summary of Financial Highlights (Detail) - $ / shares
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Net Asset Value        
Net asset value per Share, beginning of period $ 143.41 $ 121.16 $ 140.00 $ 112.35
Net investment income/(loss) (0.15) (0.12) (0.29) (0.24)
Net Realized and Change in Unrealized Gain/(Loss) 8.09 1.30 11.64 10.23
Net Income/(Loss) 7.94 1.18 11.35 9.99
Net asset value per Share, end of period 151.35 122.34 151.35 122.34
Market value per Share, beginning of period 142.90 121.25 138.87 112.76
Market value per Share, end of period $ 148.05 $ 122.01 $ 148.05 $ 122.01
Ratio to average net assets        
Net investment loss [1] (0.40%) (0.40%) (0.40%) (0.40%)
Gross expenses [1] 0.40% 0.40% 0.40% 0.40%
Net expenses [1] 0.40% 0.40% 0.40% 0.40%
Total Return, at net asset value [2] 5.54% 0.97% 8.11% 8.89%
Total Return, at market value [2] 3.60% 0.63% 6.61% 8.20%
[1] Percentages are annualized.
[2] Percentages are not annualized.