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Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Net revenues        
Revenue from contract with customer, excluding assessed tax $ 731,123 $ 681,354 $ 1,497,612 $ 1,373,951
Cost of net revenues        
Cost of net revenues 140,959 141,113 281,469 277,502
Gross profit 590,164 540,241 1,216,143 1,096,449
Operating expenses        
Sales and marketing 218,061 210,800 424,096 409,727
Research and development 136,561 122,207 267,079 241,782
General and administrative 76,645 67,184 149,668 131,902
Restructuring charges 0 90 11,321 8,562
Total 431,267 400,281 852,164 791,973
Income from operations 158,897 139,960 363,979 304,476
Other income, net 12,303 5,974 16,265 15,856
Income before income taxes 171,200 145,934 380,244 320,332
Provision for income taxes 25,670 26,913 68,269 62,929
Net income $ 145,530 $ 119,021 $ 311,975 $ 257,403
Net income per share — basic (dollars per share) $ 2.51 $ 2.02 $ 5.37 $ 4.37
Weighted average shares — basic (shares) 57,886 58,788 58,098 58,956
Net income per share — diluted (dollars per share) $ 2.48 $ 2.00 $ 5.30 $ 4.32
Weighted average shares — diluted (shares) 58,764 59,580 58,913 59,617
Product        
Net revenues        
Revenue from contract with customer, excluding assessed tax $ 337,196 $ 300,162 $ 705,693 $ 606,021
Cost of net revenues        
Cost of net revenues 81,287 85,313 164,123 168,021
Service        
Net revenues        
Revenue from contract with customer, excluding assessed tax 393,927 381,192 791,919 767,930
Cost of net revenues        
Cost of net revenues $ 59,672 $ 55,800 $ 117,346 $ 109,481