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Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Net revenues        
Revenue from contract with customer, excluding assessed tax $ 681,354 $ 703,175 $ 1,373,951 $ 1,403,553
Cost of net revenues        
Cost of net revenues 141,113 155,654 277,502 310,661
Gross profit 540,241 547,521 1,096,449 1,092,892
Operating expenses        
Sales and marketing 210,800 233,076 409,727 466,181
Research and development 122,207 141,363 241,782 283,686
General and administrative 67,184 67,036 131,902 137,027
Restructuring charges 90 0 8,562 8,740
Total 400,281 441,475 791,973 895,634
Income from operations 139,960 106,046 304,476 197,258
Other income, net 5,974 2,737 15,856 7,439
Income before income taxes 145,934 108,783 320,332 204,697
Provision for income taxes 26,913 27,347 62,929 50,859
Net income $ 119,021 $ 81,436 $ 257,403 $ 153,838
Net income per share — basic (dollars per share) $ 2.02 $ 1.35 $ 4.37 $ 2.55
Weighted average shares — basic (shares) 58,788 60,330 58,956 60,211
Net income per share — diluted (dollars per share) $ 2.00 $ 1.34 $ 4.32 $ 2.54
Weighted average shares — diluted (shares) 59,580 60,691 59,617 60,537
Product        
Net revenues        
Revenue from contract with customer, excluding assessed tax $ 300,162 $ 340,581 $ 606,021 $ 681,139
Cost of net revenues        
Cost of net revenues 85,313 99,795 168,021 198,650
Service        
Net revenues        
Revenue from contract with customer, excluding assessed tax 381,192 362,594 767,930 722,414
Cost of net revenues        
Cost of net revenues $ 55,800 $ 55,859 $ 109,481 $ 112,011