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Document and Entity Information
 6 Months Ended
Jun. 30, 2019
shares
Document And Entity Information [Abstract]  
Document Type 10-Q
Amendment Flag false
Document Period End Date Jun. 30, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q2
Trading Symbol FXY
Entity Registrant Name Invesco CurrencyShares Japanese Yen Trust
Entity Central Index Key 0001353613
Current Fiscal Year End Date --12-31
Entity Filer Category Accelerated Filer
Entity Small Business true
Entity Emerging Growth Company false
Entity Current Reporting Status Yes
Entity Shell Company false
Entity File Number 1-33298
Entity Tax Identification Number 376416176
Entity Address, Address Line One 3500 Lacey Road
Entity Address, Address Line Two Suite 700
Entity Address, City or Town Downers Grove
Entity Address, State or Province Illinois
Entity Address, Postal Zip Code 60515
City Area Code 800
Local Phone Number 983-0903
Entity Common Stock, Shares Outstanding 2,450,000