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Fair Value Measurements (Details Textual) - USD ($)
$ in Millions
Oct. 31, 2015
Jul. 31, 2015
Fair Value Assets Liabilities Quantitative Information [Line Items]    
Fair value of investments in hedge funds $ 8.9 $ 9.1
Carrying value of investments 3.4 3.4
Long-term Investments [Member]    
Fair Value Assets Liabilities Quantitative Information [Line Items]    
Fair value of investments in hedge funds $ 8.9 $ 9.1