Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity - USD ($)	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock
Beginning Balance (in shares) at Jul. 31, 2022	100,000
Beginning Balance at Jul. 31, 2022	$ 105,204,000
Increase (Decrease) in Temporary Equity [Roll Forward]
Convertible preferred stock issuance costs	0
Adjustment to reflect redemption value of convertible preferred stock (including accrued dividends)	$ (5,213,000)
Ending Balance (in shares) at Apr. 30, 2023	100,000
Ending Balance at Apr. 30, 2023	$ 110,417,000
Beginning balance (in shares) at Jul. 31, 2022		42,672,827
Beginning balance (in shares) at Jul. 31, 2022					15,033,317
Beginning balance at Jul. 31, 2022	466,585,000	$ 4,267,000	$ 625,484,000	$ 278,683,000	$ (441,849,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-classified stock award compensation	6,298,000		6,298,000
CEO transition costs related to equity-classified stock-based awards	3,764,000		3,764,000
Issuance of employee stock purchase plan shares (in shares)		41,606
Issuance of employee stock purchase plan shares	334,000	$ 4,000	330,000
Issuance of restricted stock (in shares)		93,091
Issuance of restricted stock, net of forfeiture	0	$ 9,000	(9,000)
Net settlement of stock-based awards (in shares)		114,741
Net settlement of stock-based awards	(1,664,000)	$ 12,000	(1,676,000)
Adjustment to reflect redemption value of convertible preferred stock (including accrued dividends)	(5,213,000)			(5,213,000)
Cash dividends declared, net	(5,549,000)			(5,549,000)
Accrual of dividend equivalents, net of reversal	(342,000)			(342,000)
Net loss	(23,359,000)			(23,359,000)
Ending balance (in shares) at Apr. 30, 2023		42,922,265
Ending balance (in shares) at Apr. 30, 2023					15,033,317
Ending balance at Apr. 30, 2023	$ 440,854,000	$ 4,292,000	634,191,000	244,220,000	$ (441,849,000)
Beginning Balance (in shares) at Jan. 31, 2023	100,000
Beginning Balance at Jan. 31, 2023	$ 108,651,000
Increase (Decrease) in Temporary Equity [Roll Forward]
Convertible preferred stock issuance costs	0
Adjustment to reflect redemption value of convertible preferred stock (including accrued dividends)	$ (1,766,000)
Ending Balance (in shares) at Apr. 30, 2023	100,000
Ending Balance at Apr. 30, 2023	$ 110,417,000
Beginning balance (in shares) at Jan. 31, 2023		42,900,871
Beginning balance (in shares) at Jan. 31, 2023					15,033,317
Beginning balance at Jan. 31, 2023	446,096,000	$ 4,290,000	630,233,000	253,422,000	$ (441,849,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-classified stock award compensation	4,126,000		4,126,000
Issuance of employee stock purchase plan shares (in shares)		12,146
Issuance of employee stock purchase plan shares	127,000	$ 1,000	126,000
Net settlement of stock-based awards (in shares)		9,248
Net settlement of stock-based awards	(293,000)	$ 1,000	(294,000)
Adjustment to reflect redemption value of convertible preferred stock (including accrued dividends)	(1,766,000)			(1,766,000)
Reversal of dividend equivalents	(22,000)			(22,000)
Net loss	(7,458,000)			(7,458,000)
Ending balance (in shares) at Apr. 30, 2023		42,922,265
Ending balance (in shares) at Apr. 30, 2023					15,033,317
Ending balance at Apr. 30, 2023	$ 440,854,000	$ 4,292,000	634,191,000	244,220,000	$ (441,849,000)
Beginning Balance (in shares) at Jul. 31, 2023	100,000
Beginning Balance at Jul. 31, 2023	$ 112,211,000
Increase (Decrease) in Temporary Equity [Roll Forward]
Extinguishment of convertible preferred stock (in shares)	(100,000)
Extinguishment of convertible preferred stock	$ (115,721,000)
Issuance of convertible preferred stock	166,121
Issuance of convertible preferred stock	$ 166,121,000
Convertible preferred stock issuance costs	(4,349,000)
Adjustment to reflect redemption value of convertible preferred stock (including accrued dividends)	$ 11,992,000
Ending Balance (in shares) at Apr. 30, 2024	166,121
Ending Balance at Apr. 30, 2024	$ 170,254,000
Beginning balance (in shares) at Jul. 31, 2023	43,096,271	43,096,271
Beginning balance (in shares) at Jul. 31, 2023	15,033,317				15,033,317
Beginning balance at Jul. 31, 2023	$ 438,299,000	$ 4,310,000	636,925,000	238,913,000	$ (441,849,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-classified stock award compensation	5,238,000		5,238,000
Issuance of employee stock purchase plan shares (in shares)		38,554
Issuance of employee stock purchase plan shares	219,000	$ 4,000	215,000
Issuance of restricted stock (in shares)		(2,686)
Issuance of restricted stock, net of forfeiture	0	$ 0	0
Net settlement of stock-based awards (in shares)		394,233
Net settlement of stock-based awards	(2,609,000)	$ 39,000	(2,648,000)
Adjustment to reflect redemption value of convertible preferred stock (including accrued dividends)	(11,992,000)			(11,992,000)
Reversal of dividend equivalents	104,000			104,000
Net loss	$ (9,200,000)			(9,200,000)
Ending balance (in shares) at Apr. 30, 2024	43,526,372	43,526,372
Ending balance (in shares) at Apr. 30, 2024	15,033,317				15,033,317
Ending balance at Apr. 30, 2024	$ 406,419,000	$ 4,353,000	639,730,000	204,185,000	$ (441,849,000)
Beginning Balance (in shares) at Jan. 31, 2024	166,121
Beginning Balance at Jan. 31, 2024	$ 166,495,000
Increase (Decrease) in Temporary Equity [Roll Forward]
Convertible preferred stock issuance costs	(76,000)
Adjustment to reflect redemption value of convertible preferred stock (including accrued dividends)	$ (3,835,000)
Ending Balance (in shares) at Apr. 30, 2024	166,121
Ending Balance at Apr. 30, 2024	$ 170,254,000
Beginning balance (in shares) at Jan. 31, 2024		43,506,289
Beginning balance (in shares) at Jan. 31, 2024					15,033,317
Beginning balance at Jan. 31, 2024	406,959,000	$ 4,351,000	639,300,000	205,157,000	$ (441,849,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-classified stock award compensation	404,000		404,000
Issuance of employee stock purchase plan shares (in shares)		14,437
Issuance of employee stock purchase plan shares	43,000	$ 2,000	41,000
Net settlement of stock-based awards (in shares)		5,646
Net settlement of stock-based awards	(15,000)	$ 0	(15,000)
Extinguishment of convertible preferred stock	(13,640,000)			(13,640,000)
Adjustment to reflect redemption value of convertible preferred stock (including accrued dividends)	(3,835,000)			(3,835,000)
Reversal of dividend equivalents	68,000			68,000
Net loss	$ 2,795,000			2,795,000
Ending balance (in shares) at Apr. 30, 2024	43,526,372	43,526,372
Ending balance (in shares) at Apr. 30, 2024	15,033,317				15,033,317
Ending balance at Apr. 30, 2024	$ 406,419,000	$ 4,353,000	$ 639,730,000	$ 204,185,000	$ (441,849,000)