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 loss	(42,471)			(42,471)
Preferred dividends	(1,074)			(1,074)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		499
Restricted stock grants, net of forfeitures (in shares)		(2,642,275)
Restricted stock grants, net of forfeitures	0	$ (27)	27
Share-based compensation	408		408
Other comprehensive items	185				185
Ending balance (in shares) at Jan. 31, 2022		60,457,720
Ending balance at Jan. 31, 2022	(36,740)	$ 605	7,479,073	(7,523,765)	7,347
Beginning balance (in shares) at Oct. 31, 2021		60,437,654
Beginning balance at Oct. 31, 2021	(13,431)	$ 605	7,478,855	(7,500,251)	7,360
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(22,977)			(22,977)
Preferred dividends	(537)			(537)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		331
Restricted stock grants, net of forfeitures (in shares)		19,735
Share-based compensation	218		218
Other comprehensive items	(13)				(13)
Ending balance (in shares) at Jan. 31, 2022		60,457,720
Ending balance at Jan. 31, 2022	$ (36,740)	$ 605	7,479,073	(7,523,765)	7,347
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 loss	4,431			4,431
Preferred dividends	(1,074)			(1,074)
Restricted stock grants (in shares)		255,031
Restricted stock grants	0	$ 2	(2)
Share-based compensation	355		355
Other comprehensive items	$ 740				740
Ending balance (in shares) at Jan. 31, 2023	60,784,589	60,784,589
Ending balance at Jan. 31, 2023	$ (4,754)	$ 607	7,479,719	(7,489,960)	4,880
Beginning balance (in shares) at Oct. 31, 2022		60,657,539
Beginning balance at Oct. 31, 2022	(8,524)	$ 606	7,479,542	(7,488,897)	225
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(526)			(526)
Preferred dividends	(537)			(537)
Restricted stock grants (in shares)		127,050
Restricted stock grants	0	$ 1	(1)
Share-based compensation	178		178
Other comprehensive items	$ 4,655				4,655
Ending balance (in shares) at Jan. 31, 2023	60,784,589	60,784,589
Ending balance at Jan. 31, 2023	$ (4,754)	$ 607	$ 7,479,719	$ (7,489,960)	$ 4,880