Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2020	Jul. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 3,905	$ 2,322
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	46,812,750	46,362,902
Common Stock, shares outstanding	42,162,218	41,771,228
Treasury Stock, shares	4,650,532	4,591,674