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Earnings (Loss) Per Share (Details 1) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Shares excluded from the calculation of diluted earnings (loss) per share	416	504		504
Non-vested restricted Class B common stock [Member]
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Shares excluded from the calculation of diluted earnings (loss) per share	409	474		474
Stock Option [Member]
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Shares excluded from the calculation of diluted earnings (loss) per share	7	30		30

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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