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Fair Value Measurements (Narrative) (Details) (USD $)	Feb. 29, 2012	Aug. 31, 2011	Feb. 28, 2011
Fair Value Measurements [Abstract]
Principal Payments due on long-term debt	$ 6,429,000	$ 8,571,000	$ 10,714,000
Long-term portion	$ 6,400,000	$ 8,500,000	$ 10,500,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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