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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Income Statement [Abstract]        
Net sales $ 120,381,000 $ 161,292,000 $ 237,140,000 $ 296,510,000
Cost of sales 74,523,000 105,612,000 149,547,000 190,622,000
Gross profit 45,858,000 55,680,000 87,593,000 105,888,000
Expenses:        
Selling, general and administrative 29,827,000 29,462,000 58,069,000 57,002,000
Research and development 12,632,000 12,664,000 25,129,000 24,299,000
Amortization of intangibles 5,349,000 4,795,000 10,698,000 10,361,000
CEO transition costs 13,554,000 0 13,554,000 0
Proxy solicitation costs 9,086,000 0 11,248,000 0
Acquisition plan expenses 0 3,357,000 0 94,540,000
Total operating expenses 70,448,000 50,278,000 118,698,000 186,202,000
Operating (loss) income (24,590,000) 5,402,000 (31,105,000) (80,314,000)
Other expenses (income):        
Interest expense 988,000 1,418,000 2,595,000 3,715,000
Interest (income) and other (30,000) (66,000) 189,000 0
Change in fair value of convertible preferred stock purchase option liability (398,000) 0 (702,000) 0
(Loss) income before benefit from income taxes (25,150,000) 4,050,000 (33,187,000) (84,029,000)
Benefit from income taxes (3,276,000) (155,000) (5,329,000) (2,394,000)
Net (loss) income (21,874,000) 4,205,000 (27,858,000) (81,635,000)
Convertible preferred stock issuance costs 0 0 (4,007,000) 0
Establishment of initial convertible preferred stock purchase option liability 0 0 (1,005,000) 0
Dividend on convertible preferred stock (1,632,000) 0 (1,867,000) 0
Net (loss) income attributable to common stockholders $ (23,506,000) $ 4,205,000 $ (34,737,000) $ (81,635,000)
Net (loss) income per common share (See Note 6):        
Basic (in dollars per share) $ (0.89) $ 0.17 $ (1.31) $ (3.22)
Diluted (in dollars per share) $ (0.89) $ 0.17 $ (1.31) $ (3.22)
Weighted average number of common shares outstanding - basic (in shares) 26,472,000 25,337,000 26,449,000 25,321,000
Weighted average number of common and common equivalent shares outstanding - diluted (in shares) 26,472,000 25,420,000 26,449,000 25,321,000