CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2017	Jul. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 2,295	$ 1,808
Preferred Stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred Stock, authorized shares	1,000,000	1,000,000
Preferred Stock, shares issued	0	0
Common Stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, authorized shares	75,000,000	75,000,000
Common Stock, shares issued	46,332,826	46,194,370
Common Stock, shares outstanding	41,805,879	41,728,934
Treasury Stock, shares	4,526,947	4,465,440