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Short-Term Investments	12 Months Ended
Short-Term Investments	Jul. 31, 2012
Short-Term Investments [Abstract]
Short-Term Investments	NOTE B Short-Term Investments All short-term investments are time deposits and have original maturities in excess of three months but not more than twelve months. The Company had $92.4 million in short-term investments as of July 31, 2012, and the Company did not have any short-term investments as of July 31, 2011.