Earnings (Loss) Per Share (Details 1) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Shares excluded from the calculation of diluted earnings (loss) per share				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				474
Stock options [Member]
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Shares excluded from the calculation of diluted earnings (loss) per share				30