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Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Net revenues      
Net revenues $ 2,813,169 $ 2,695,845 $ 2,603,416
Cost of net revenues      
Cost of net revenues 593,308 539,627 493,146
Gross profit 2,219,861 2,156,218 2,110,270
Operating expenses      
Sales and marketing 878,215 926,591 929,983
Research and development 540,285 543,368 512,627
General and administrative 263,405 274,558 273,635
Restructuring charges 65,388 7,909 0
Total 1,747,293 1,752,426 1,716,245
Income from operations 472,568 403,792 394,025
Other income (expense), net 13,420 (18,399) (7,088)
Income before income taxes 485,988 385,393 386,937
Provision for income taxes 91,040 63,233 55,696
Net income $ 394,948 $ 322,160 $ 331,241
Net income per share - basic (USD per share) $ 6.59 $ 5.34 $ 5.46
Weighted average shares - basic (shares) 59,909 60,274 60,707
Net income per share - diluted (USD per share) $ 6.55 $ 5.27 $ 5.34
Weighted average shares - diluted (shares) 60,270 61,097 62,057
Product [Member]      
Net revenues      
Net revenues $ 1,334,638 $ 1,317,117 $ 1,247,084
Cost of net revenues      
Cost of net revenues 375,192 319,713 286,293
Service [Member]      
Net revenues      
Net revenues 1,478,531 1,378,728 1,356,332
Cost of net revenues      
Cost of net revenues $ 218,116 $ 219,914 $ 206,853