Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2019	Jul. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 1,498	$ 1,149
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)	46,356,251	46,243,582
Common Stock, outstanding (in shares)	41,765,917	41,706,084
Treasury Stock (in shares)	4,590,334	4,537,498