Earnings (Loss) Per Share (Details 1) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Shares excluded from the calculation of diluted loss per share		1,311
Non-vested restricted Class B common stock [Member]
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Shares excluded from the calculation of diluted loss per share		1,279
Shares underlying stock options [Member]
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Shares excluded from the calculation of diluted loss per share		32