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Commitments and Contingencies (Details) (USD $)	Nov. 30, 2011	Aug. 31, 2011
Securities class action liability	$ 161,000,000	$ 161,150,000
Securities Class Action (Policeman's Annuity and Benefit Fund of Chicago) [Member]
Agreement in principle settlement amount	145,000,000
Securities class action liability	$ 161,000,000

Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

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