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Financial Highlights - Summary of Financial Highlights (Detail) - $ / shares
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Net Asset Value        
Net asset value per Share, beginning of period $ 121.16 $ 123.05 $ 112.35 $ 121.91
Net investment income/(loss) (0.12) (0.12) (0.24) (0.25)
Net Realized and Change in Unrealized Gain (Loss) 1.30 2.60 10.23 3.87
Net Income/(Loss) 1.18 2.48 9.99 3.62
Net asset value per Share, end of period 122.34 125.53 122.34 125.53
Market value per Share, beginning of period 121.25 123.65 112.76 121.58
Market value per Share, end of period $ 122.01 $ 125.79 $ 122.01 $ 125.79
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] 0.97% 2.02% 8.89% 2.97%
Total Return, at market value [2] 0.63% 1.73% 8.20% 3.46%
[1] Percentages are annualized.
[2] Percentages are not annualized.