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Consolidated Statements of Shareholders' Equity Statement - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
AOCI Attributable to Parent
Retained Earnings
Beginning Balance (in shares) at Sep. 30, 2023   59,207    
Beginning Balance at Sep. 30, 2023 $ 2,800,232 $ 24,399 $ (23,221) $ 2,799,054
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   33    
Exercise of employee stock options 1,088 $ 1,088    
Issuance of stock under employee stock purchase plan (in shares)   188    
Issuance of stock under employee stock purchase plan 21,469 $ 21,469    
Issuance of restricted stock (in shares)   701    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (1,465)    
Repurchase of common stock, including excise taxes (251,589) $ (130,403)   (121,186)
Taxes paid related to net share settlement of equity awards (in shares)   (55)    
Taxes paid related to net share settlement of equity awards (8,667) $ (8,667)    
Stock-based compensation 111,143 $ 111,143    
Net income 257,403     257,403
Other comprehensive income (loss) 2,187   2,187  
Ending Balance ( in shares) at Mar. 31, 2024   58,609    
Ending Balance at Mar. 31, 2024 2,933,266 $ 19,029 (21,034) 2,935,271
Beginning Balance (in shares) at Dec. 31, 2023   58,797    
Beginning Balance at Dec. 31, 2023 2,860,977 $ 18,348 (20,668) 2,863,297
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   19    
Exercise of employee stock options 680 $ 680    
Issuance of restricted stock (in shares)   346    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (543)    
Repurchase of common stock, including excise taxes (100,351) $ (53,304)   (47,047)
Taxes paid related to net share settlement of equity awards (in shares)   (10)    
Taxes paid related to net share settlement of equity awards (1,836) $ (1,836)    
Stock-based compensation 55,141 $ 55,141    
Net income 119,021     119,021
Other comprehensive income (loss) (366)   (366)  
Ending Balance ( in shares) at Mar. 31, 2024   58,609    
Ending Balance at Mar. 31, 2024 $ 2,933,266 $ 19,029 (21,034) 2,935,271
Beginning Balance (in shares) at Sep. 30, 2024 58,094 58,094    
Beginning Balance at Sep. 30, 2024 $ 3,129,378 $ 5,889 (20,912) 3,144,401
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   19    
Exercise of employee stock options 699 $ 699    
Issuance of stock under employee stock purchase plan (in shares)   163    
Issuance of stock under employee stock purchase plan 23,172 $ 23,172    
Issuance of restricted stock (in shares)   680    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (971)    
Repurchase of common stock, including excise taxes (250,490) $ (90,217)   (160,273)
Taxes paid related to net share settlement of equity awards (in shares)   (66)    
Taxes paid related to net share settlement of equity awards (16,083) $ (16,083)    
Stock-based compensation 116,792 $ 116,792    
Net income 311,975     311,975
Other comprehensive income (loss) $ (1,398)   (1,398)  
Ending Balance ( in shares) at Mar. 31, 2025 57,919 57,919    
Ending Balance at Mar. 31, 2025 $ 3,314,045 $ 40,252 (22,310) 3,296,103
Beginning Balance (in shares) at Dec. 31, 2024   58,132    
Beginning Balance at Dec. 31, 2024 3,235,751 $ 9,461 (24,199) 3,250,489
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   6    
Exercise of employee stock options 176 $ 176    
Issuance of restricted stock (in shares)   271    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (481)    
Repurchase of common stock, including excise taxes (125,470) $ (25,554)   (99,916)
Taxes paid related to net share settlement of equity awards (in shares)   (9)    
Taxes paid related to net share settlement of equity awards (2,715) $ (2,715)    
Stock-based compensation 58,884 $ 58,884    
Net income 145,530     145,530
Other comprehensive income (loss) $ 1,889   1,889  
Ending Balance ( in shares) at Mar. 31, 2025 57,919 57,919    
Ending Balance at Mar. 31, 2025 $ 3,314,045 $ 40,252 $ (22,310) $ 3,296,103