Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2020	Jul. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 3,077	$ 2,322
Preferred Stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred Stock, authorized (in shares)	1,000,000	1,000,000
Preferred Stock, issued (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, authorized (in shares)	75,000,000	75,000,000
Common Stock, issued (in shares)	47,229,396	46,362,902
Common Stock, outstanding (in shares)	42,145,737	41,771,228
Treasury Stock (in shares)	4,645,300	4,591,674