Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2020	Jul. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 4,029	$ 3,905
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)	46,924,945	46,812,750
Common Stock, outstanding (in shares)	42,243,881	42,162,218
Treasury Stock (in shares)	4,681,064	4,650,532