Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Allowance for doubtful accounts	$ 1,283	$ 348
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	62,306,037	62,210,429
Treasury, shares	9,911,474	8,880,877