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Comparative Data for the Two Months Ended December 31, 2017 (Unaudited) - Comparative Data for Statements of Cash Flows (Detail)
 2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
AUD ($)
Dec. 31, 2017
USD ($)
Oct. 31, 2018
USD ($)
Jul. 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
Jan. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Oct. 31, 2018
USD ($)
Oct. 31, 2018
AUD ($)
Oct. 31, 2017
USD ($)
Oct. 31, 2017
AUD ($)
Cash flows from operating activities                              
Cash received for accrued income $ 268,567   $ 260,546                 $ 1,727,420   $ 2,152,354  
Cash paid for Sponsor's fee (79,004)   (92,387)                 (514,607)   (693,136)  
Net cash provided by operating activities 189,563   168,159                 1,212,813   1,459,218  
Cash flows from financing activities                              
Cash received to purchase redeemable Shares 7,287,860 $ 10,000,000 3,819,070                 18,880,911 $ 25,000,000 34,369,885 $ 45,000,000
Cash paid to redeem redeemable Shares (10,854,234) $ (15,000,000) (15,275,524)                 (30,200,732) $ (40,000,000) (72,530,089) $ (95,000,000)
Cash paid for distributions (189,938)   (165,335)                 (1,210,590)   (1,460,231)  
Net cash used in financing activities (3,756,312)   (11,621,789)                 (12,530,411)   (39,620,435)  
Adjustment to period cash flows due to currency movement (761,845)   2,572,264                 (10,039,407)   1,185,525  
Decrease in cash (4,328,594)   (8,881,366)                 (21,357,005)   (36,975,692)  
Cash at beginning of period/year 120,489,875   141,846,880       $ 141,846,880       $ 178,822,572 141,846,880   178,822,572  
Cash at end of period/year 116,161,281   132,965,514 $ 120,489,875       $ 141,846,880       120,489,875   141,846,880  
Reconciliation of net comprehensive income to net cash provided by operating activities                              
Net Comprehensive Income 173,016   132,613 $ 321,645 $ 367,223 $ 299,008 $ 238,824 $ 336,638 $ 377,944 $ 357,147 $ 383,593 1,226,700   1,455,322  
Adjustments to reconcile net comprehensive income to net cash provided by operating activities:                              
Receivable from accrued interest (126,824)   (105,634)                 (144,808)   (144,205)  
Prior period receivable from accrued interest 144,808   144,205                 144,205   156,931  
Effect of exchange rate on cash (319)   1,048                 (4,279)   2,848  
Accrued Sponsor's fee 38,941   45,185                 40,253   49,258  
Prior period accrued Sponsor's fee (40,253)   (49,258)                 (49,258)   (60,936)  
Net cash provided by operating activities $ 189,563   $ 168,159                 $ 1,212,813   $ 1,459,218