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Significant accounting policies (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Mar. 31, 2012
Sep. 30, 2011
Sep. 30, 2010
Valuation of Gold      
Investment in gold - average cost $ 46,663,999 [1] $ 42,736,696 [1],[2] $ 37,736,064
Unrealized gain on investment in gold 22,107,220 21,948,152  
Investment in gold - market value 68,771,219 64,684,848  
Gold Receivable      
Gold receivable 0 0  
Gold Payable      
Gold payable 0 520,297 [2]  
Number of Redeemable Shares:      
Opening Balance 406,800,000 [2] 429,200,000  
Creations 41,400,000 115,600,000  
Redemptions (22,500,000) (138,000,000)  
Closing Balance 425,700,000 406,800,000 [2]  
Redeemable Shares:      
Opening Balance 64,137,833 [2],[3] 54,809,779  
Creations 6,953,446 17,521,097  
Redemptions (3,554,367) (20,567,866)  
Adjustment to redemption value 1,205,585 12,374,823  
Closing Balance $ 68,742,497 [3] $ 64,137,833 [2],[3]  
Redemption Value per Redeemable Share at Period End $ 161.48 $ 157.66  
Significant accounting policies (Textual) [Abstract]      
Minimum block of shares issued redeemed against gold 100,000    
Maximum number of days within which ownership of the gold is transferred 3 days    
[1] The market value of Investment in Gold at March 31, 2012 is $68,771,219 and at September 30, 2011 was $64,684,848.
[2] Derived from audited statement of condition as of September 30, 2011.
[3] Authorized share capital is unlimited and the par value of the shares is $0.00. Shares issued and outstanding at March 31, 2012 was 425,700,000 and at September 30, 2011 was 406,800,000.