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Statements of Financial Condition (Parenthetical) - $ / shares
Oct. 31, 2017
Oct. 31, 2016
Statement of Financial Position [Abstract]    
Redeemable Capital Shares, no par value
Redeemable Capital Shares, shares authorized 38,500,000 38,500,000
Redeemable Capital Shares, shares issued 1,850,000 2,350,000
Redeemable Capital Shares, shares outstanding 1,850,000 2,350,000