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Long Term Debt (Schedule Of Minimum Principal Payments) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011
Debt Disclosure [Abstract]
2013	$ 1,084
2014	2,888
Total long term debt	$ 3,972	$ 5,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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