3.21.2 html 25 163 1 false 5 0 false 6 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.currencyshares.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Statements of Financial Condition (Parenthetical) (Unaudited) Sheet http://www.currencyshares.com/20210930/taxonomy/role/StatementStatementsOfFinancialConditionParentheticalUnaudited Statements of Financial Condition (Parenthetical) (Unaudited) Statements 2 false false R3.htm 100020 - Statement - Statements of Financial Condition (Unaudited) Sheet http://www.currencyshares.com/20210930/taxonomy/role/StatementStatementsOfFinancialConditionUnaudited Statements of Financial Condition (Unaudited) Statements 3 false false R4.htm 100030 - Statement - Statements of Comprehensive Income (Unaudited) Sheet http://www.currencyshares.com/20210930/taxonomy/role/StatementStatementsOfComprehensiveIncomeUnaudited Statements of Comprehensive Income (Unaudited) Statements 4 false false R5.htm 100040 - Statement - Statements of Changes in Shareholders' Equity and Redeemable Capital Shares Sheet http://www.currencyshares.com/20210930/taxonomy/role/StatementStatementsOfChangesInShareholdersEquityAndRedeemableCapitalShares Statements of Changes in Shareholders' Equity and Redeemable Capital Shares Statements 5 false false R6.htm 100050 - Statement - Statements of Cash Flows (Unaudited) Sheet http://www.currencyshares.com/20210930/taxonomy/role/StatementStatementsOfCashFlowsUnaudited Statements of Cash Flows (Unaudited) Statements 6 false false R7.htm 100060 - Disclosure - Background Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureBackground Background Notes 7 false false R8.htm 100070 - Disclosure - Organization Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureOrganization Organization Notes 8 false false R9.htm 100080 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 100090 - Disclosure - Japanese Yen Deposits Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureJapaneseYenDeposits Japanese Yen Deposits Notes 10 false false R11.htm 100100 - Disclosure - Concentration Risk Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureConcentrationRisk Concentration Risk Notes 11 false false R12.htm 100110 - Disclosure - Service Providers and Related Party Agreements Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureServiceProvidersAndRelatedPartyAgreements Service Providers and Related Party Agreements Notes 12 false false R13.htm 100120 - Disclosure - Share Purchases and Redemptions Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureSharePurchasesAndRedemptions Share Purchases and Redemptions Notes 13 false false R14.htm 100130 - Disclosure - Commitments and Contingencies Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 14 false false R15.htm 100140 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.currencyshares.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies 15 false false R16.htm 100150 - Disclosure - Organization - Additional Information (Detail) Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureOrganizationAdditionalInformationDetail Organization - Additional Information (Detail) Details 16 false false R17.htm 100160 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail Summary of Significant Accounting Policies - Additional Information (Detail) Details 17 false false R18.htm 100170 - Disclosure - Japanese Yen Deposits - Additional Information (Detail) Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureJapaneseYenDepositsAdditionalInformationDetail Japanese Yen Deposits - Additional Information (Detail) Details 18 false false R19.htm 100180 - Disclosure - Service Providers and Related Party Agreements - Additional Information (Detail) Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureServiceProvidersAndRelatedPartyAgreementsAdditionalInformationDetail Service Providers and Related Party Agreements - Additional Information (Detail) Details 19 false false R20.htm 100190 - Disclosure - Share Purchase and Redemptions - Additional Information (Detail) Sheet http://www.currencyshares.com/20210930/taxonomy/role/DisclosureSharePurchaseAndRedemptionsAdditionalInformationDetail Share Purchase and Redemptions - Additional Information (Detail) Details 20 false false All Reports Book All Reports fxy-10q_20210930.htm fxy-20210930.xsd fxy-20210930_cal.xml fxy-20210930_def.xml fxy-20210930_lab.xml fxy-20210930_pre.xml fxy-ex311_8.htm fxy-ex312_9.htm fxy-ex321_6.htm fxy-ex322_7.htm gwv4rcdq5x0w000001.jpg gwv4rcdq5x0w000002.jpg gwv4rcdq5x0w000003.jpg http://xbrl.sec.gov/dei/2021 http://fasb.org/us-gaap/2021-01-31 true true