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Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Net revenues      
Net revenues $ 3,088,072 $ 2,816,120 $ 2,813,169
Cost of net revenues      
Cost of net revenues 573,978 557,647 593,308
Gross profit 2,514,094 2,258,473 2,219,861
Operating expenses      
Sales and marketing 860,506 832,279 878,215
Research and development 539,815 490,120 540,285
General and administrative 322,340 268,828 263,405
Restructuring charges 25,484 8,655 65,388
Total 1,748,145 1,599,882 1,747,293
Income from operations 765,949 658,591 472,568
Other income, net 42,387 36,874 13,420
Income before income taxes 808,336 695,465 485,988
Provision for income taxes 115,956 128,687 91,040
Net income $ 692,380 $ 566,778 $ 394,948
Net income per share - basic (USD per share) $ 11.96 $ 9.65 $ 6.59
Weighted average shares - basic (shares) 57,904 58,720 59,909
Net income per share - diluted (USD per share) $ 11.80 $ 9.55 $ 6.55
Weighted average shares - diluted (shares) 58,684 59,359 60,270
Product [Member]      
Net revenues      
Net revenues $ 1,508,640 $ 1,272,795 $ 1,334,638
Cost of net revenues      
Cost of net revenues 338,037 336,237 375,192
Service [Member]      
Net revenues      
Net revenues 1,579,432 1,543,325 1,478,531
Cost of net revenues      
Cost of net revenues $ 235,941 $ 221,410 $ 218,116