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Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees - Amounts Payable to Related Parties (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Amounts Payable to Related Parties
Accounts payable to related parties	$ 12,133	$ 22,038
Custodian [Member]
Amounts Payable to Related Parties
Accounts payable to related parties	2,190	3,908
Trustee [Member]
Amounts Payable to Related Parties
Accounts payable to related parties	165	164
Sponsor [Member]
Amounts Payable to Related Parties
Accounts payable to related parties	4,889	8,983
Marketing Agent [Member]
Amounts Payable to Related Parties
Accounts payable to related parties	$ 4,889	$ 8,983

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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