Statements of Assets and Liabilities (Parenthetical) - USD ($)	Apr. 30, 2018	Jan. 31, 2018
Statement of Financial Position [Abstract]
Investments in gold bullion cost	$ 138,324,120	$ 131,137,185

Cost of the investment.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=63488139&loc=d3e12121-115841

Name:	us-gaap_InvestmentOwnedAtCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant