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Significant Accounting Policies - Schedule of Changes in Resale of Shares (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Accounting Policies [Abstract]                
Creations             12,550 375,300 [1]
Redemptions             3,150 37,900 [1]
Net change in Number of Shares Created and Redeemed             9,400 337,400 [1]
Creations $ 160,525 $ 37,409 $ 156,478 $ 30,643 $ 42,577 $ 197,934 $ 229,698
Redemptions $ (14,027) $ (33,725) $ (12,796) $ (18,006) 47,752 30,802
Net change in Value of Shares Created and Redeemed             $ 150,182 $ 198,896
[1] Adjusted for effects of a 10-for-1 stock split. Stock split was effective on March 7, 2019. See Note 1.