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Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Sep. 30, 2011
Amounts Payable to Related Parties    
Accounts payable to related parties $ 21,675 $ 21,500 [1]
Custodian [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 3,850 3,816
Trustee [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 169 164
Sponsor [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 8,828 8,760
Marketing agent [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties $ 8,828 $ 8,760
[1] Derived from audited statement of condition as of September 30, 2011.