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Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees (Details) (USD $)
In Thousands
Sep. 30, 2011
Sep. 30, 2010
Amounts Payable to Related Parties  
Accounts payable to related parties$ 21,500$ 16,065
Marketing agent [Member]
  
Amounts Payable to Related Parties  
Accounts payable to related parties8,7606,530
Custodian [Member]
  
Amounts Payable to Related Parties  
Accounts payable to related parties3,8162,841
Trustee [Member]
  
Amounts Payable to Related Parties  
Accounts payable to related parties164164
Sponsor [Member]
  
Amounts Payable to Related Parties  
Accounts payable to related parties$ 8,760$ 6,530