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Service Providers and Related Party Agreements - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019
Sponsor [Member] | Accrued Professional Fees [Member]
Related Party Transaction [Line Items]
Sponsor's fee accrues daily and paid monthly, annual nominal Rate	0.40%

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fxy_SponsorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=fxy_AccruedProfessionalFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: