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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Revenue:      
Revenue $ 430,221 $ 424,046 $ 444,849
Cost of sales:      
Amortization 3,933 3,813 3,962
Total cost of sales 159,544 174,140 192,646
Gross profit 270,677 249,906 252,203
Operating expenses:      
Sales and marketing 91,834 83,278 81,681
Research and development 63,659 60,289 58,648
General and administrative 58,894 58,250 61,779
Total operating expenses 214,387 201,817 202,108
Operating income 56,290 48,089 50,095
Other expense, net:      
Interest expense, net (6,319) (15,415) (25,236)
Other (expense) income, net (54) (94) 59
Total other expense, net (6,373) (25,231) (25,177)
Income before income taxes 49,917 22,858 24,918
Income tax expense 9,113 353 148
Net income $ 40,804 $ 22,505 $ 24,770
Net income per common share:      
Basic $ 1.10 $ 0.62 $ 0.69
Diluted net income per common share:      
Diluted $ 1.08 $ 0.61 $ 0.67
Weighted average common shares:      
Basic (shares) 36,959,000 36,316,000 35,820,000
Diluted (shares) 37,739,000 36,984,000 36,869,000
Deferred Debt Issuance Cost, Writeoff $ 0 $ (9,722) $ 0
Product      
Revenue:      
Revenue 296,584 304,540 331,162
Cost of sales:      
Cost of sales 128,028 144,790 161,451
Service      
Revenue:      
Revenue 133,637 119,506 113,687
Cost of sales:      
Cost of sales $ 27,583 $ 25,537 $ 27,233