XML 19 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol FXY    
Entity Registrant Name Invesco CurrencyShares Japanese Yen Trust    
Entity Central Index Key 0001353613    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   2,300,000  
Entity Public Float     $ 216,457,500
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Title of 12(b) Security Common Units of Beneficial Interest    
Entity File Number 001-33298    
Entity Incorporation, State or Country Code NY    
Entity Tax Identification Number 37-6416176    
Entity Interactive Data Current Yes    
Security Exchange Name NYSEArca    
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 IL    
Entity Address, Postal Zip Code 60515    
City Area Code 800    
Local Phone Number 983-0903    
Document Annual Report true    
Document Transition Report false