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Fair Value Measurements - Additional Information (Detail) (USD $)	6 Months Ended
	Feb. 28, 2013	Feb. 29, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement transfer	$ 0	$ 0

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- Details

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- Definition

Fair value measurements transfers between level one and level two.

+ References

No definition available.

+ Details

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