CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Jul. 31, 2021		63,099,496
Beginning balance at Jul. 31, 2021	$ 6,212	$ 632	$ 7,478,638	$ (7,480,220)	$ 7,162
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(19,494)			(19,494)
Preferred dividends	(537)			(537)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		168
Restricted stock forfeitures, net of issuance (in shares)		(2,662,010)
Restricted stock grants, net of forfeitures	0	$ (27)	27
Share-based compensation	190		190
Other comprehensive items	198				198
Ending balance (in shares) at Oct. 31, 2021		60,437,654
Ending balance at Oct. 31, 2021	$ (13,431)	$ 605	7,478,855	(7,500,251)	7,360
Beginning balance (in shares) at Jul. 31, 2022	60,529,558	60,529,558
Beginning balance at Jul. 31, 2022	$ (9,206)	$ 605	7,479,366	(7,493,317)	4,140
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,957			4,957
Preferred dividends	(537)			(537)
Restricted stock grants (in shares)		127,981
Restricted stock grants, net of forfeitures	0	$ 1	(1)
Share-based compensation	177		177
Other comprehensive items	$ (3,915)				(3,915)
Ending balance (in shares) at Oct. 31, 2022	60,657,539	60,657,539
Ending balance at Oct. 31, 2022	$ (8,524)	$ 606	$ 7,479,542	$ (7,488,897)	$ 225