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Net Asset Value and Financial Highlights (Details) - $ / shares
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2016
Net Asset Value      
Net asset value per Share, beginning of period $ 25 $ 24.21 $ 24.24
Net investment income (loss) (0.05) (0.08) (0.28)
Net realized and unrealized gain (loss) (0.68) (1.19) (1.02)
Net Income (Loss) (0.73) (1.27) (1.3)
Net Asset Value per Share, end of period 24.27 22.94 22.94
Market Value per Share, end of period $ 24.32 [1] $ 23.03 $ 23.03
Ratios to Average Net Assets      
Expense Ratio [2],[3] 1.71% 1.68% 1.71%
Expense Ratio before Waiver/Assumption [2],[3] 10.56% 3.15% 4.41%
Net Investment Income (Loss) [3] (1.71%) (1.46%) (1.57%)
Total Return, at Net Asset Value [4] (2.92%) (5.25%) [3] (5.36%)
Total Return, at Market Value [4] (2.72%) (4.95%) [3] (5.73%)
[1] Represents the closing bid/ask mean as of March 31, 2015.
[2] As of February 19, 2015 Fund expenses have been capped at 1.50% of average daily net assets, plus brokerage commissions and interest expense, as disclosed in Note 4.
[3] Percentages are annualized.
[4] Percentages are not annualized.