Consolidated Balance Sheets (Parenthetical) - USD ($)	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024
Stockholders’ equity:
Convertible preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Convertible preferred stock, shares authorized (in shares)	178,181	171,827
Convertible preferred stock, shares issued (in shares)	178,181	171,827
Redemption value of Series B-3 Convertible Preferred Stock at July 31, 2025	$ 204,153,000	$ 180,076,000
Convertible preferred stock, accrued dividends	$ 1,520,000	$ 1,341,000
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	1,821,819	1,828,173
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	44,443,626	43,766,109
Treasury stock, shares (in shares)	15,033,317	15,033,317