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Statements of Financial Condition (Parenthetical) - $ / shares
Jan. 31, 2018
Oct. 31, 2017
Statement of Financial Position [Abstract]    
Redeemable Capital Shares, no par value
Redeemable Capital Shares, shares authorized 137,000,000 137,000,000
Redeemable Capital Shares, shares issued 2,750,000 3,500,000
Redeemable Capital Shares, shares outstanding 2,750,000 3,500,000