Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2024	Apr. 30, 2023
Income Statement [Abstract]
Net sales	$ 128,076,000	$ 136,316,000	$ 414,212,000	$ 401,180,000
Cost of sales	89,122,000	93,170,000	284,178,000	265,307,000
Gross profit	38,954,000	43,146,000	130,034,000	135,873,000
Expenses:
Selling, general and administrative	28,697,000	31,397,000	91,699,000	89,649,000
Research and development	5,746,000	11,676,000	20,401,000	36,868,000
Amortization of intangibles	5,289,000	5,349,000	15,866,000	16,047,000
Loss (gain) on business divestiture, net	200,000	0	(2,013,000)	0
CEO transition costs	2,492,000	0	2,492,000	9,090,000
Total operating expenses	42,424,000	48,422,000	128,445,000	151,654,000
Operating (loss) income	(3,470,000)	(5,276,000)	1,589,000	(15,781,000)
Other expenses (income):
Interest expense	5,146,000	4,386,000	15,343,000	10,412,000
Interest (income) and other	409,000	728,000	1,246,000	928,000
Change in fair value of warrants	(6,439,000)	0	(6,439,000)	0
Loss before (benefit from) provision for income taxes	(2,586,000)	(10,390,000)	(8,561,000)	(27,121,000)
(Benefit from) provision for income taxes	(5,381,000)	(2,932,000)	639,000	(3,762,000)
Net income (loss)	2,795,000	(7,458,000)	(9,200,000)	(23,359,000)
Establishment of initial convertible preferred stock purchase option liability	0	0	(13,640,000)	0
Convertible preferred stock issuance costs	76,000	0	4,349,000	0
Dividend on convertible preferred stock	(3,759,000)	(1,766,000)	(7,643,000)	(5,213,000)
Net loss attributable to common stockholders	$ (1,040,000)	$ (9,224,000)	$ (34,832,000)	$ (28,572,000)
Net loss per common share (See Note 6):
Basic (in dollars per share)	$ (0.04)	$ (0.33)	$ (1.21)	$ (1.02)
Diluted (in dollars per share)	$ (0.04)	$ (0.33)	$ (1.21)	$ (1.02)
Weighted average number of common shares outstanding - basic (in shares)	28,854,000	28,071,000	28,753,000	27,950,000
Weighted average number of common and common equivalent shares outstanding - diluted (in shares)	28,854,000	28,071,000	28,753,000	27,950,000