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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, 2021   60,652    
Beginning Balance at Sep. 30, 2021 $ 2,360,213 $ 192,458 $ (20,073) $ 2,187,828
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   115    
Exercise of employee stock options 2,753 $ 2,753    
Issuance of stock under employee stock purchase plan (in shares)   412    
Issuance of stock under employee stock purchase plan 60,927 $ 60,927    
Issuance of restricted stock (in shares)   1,080    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (2,611)    
Repurchase of common stock (500,023) $ (394,141)   (105,882)
Taxes paid related to net share settlement of equity awards (in shares)   (92)    
Taxes paid related to net share settlement of equity awards (18,907) $ (18,907)    
Stock-based compensation 189,761 $ 189,761    
Net income 232,814     232,814
Other comprehensive income (loss) (4,553)   (4,553)  
Ending Balance ( in shares) at Jun. 30, 2022   59,556    
Ending Balance at Jun. 30, 2022 2,322,985 $ 32,851 (24,626) 2,314,760
Beginning Balance (in shares) at Mar. 31, 2022   60,465    
Beginning Balance at Mar. 31, 2022 2,397,128 $ 82,133 (22,628) 2,337,623
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   19    
Exercise of employee stock options 450 $ 450    
Issuance of stock under employee stock purchase plan (in shares)   243    
Issuance of stock under employee stock purchase plan 34,602 $ 34,602    
Issuance of restricted stock (in shares)   305    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (1,463)    
Repurchase of common stock (250,000) $ (144,118)   (105,882)
Taxes paid related to net share settlement of equity awards (in shares)   (13)    
Taxes paid related to net share settlement of equity awards (2,091) $ (2,091)    
Stock-based compensation 61,875 $ 61,875    
Net income 83,019     83,019
Other comprehensive income (loss) (1,998)   (1,998)  
Ending Balance ( in shares) at Jun. 30, 2022   59,556    
Ending Balance at Jun. 30, 2022 $ 2,322,985 $ 32,851 (24,626) 2,314,760
Beginning Balance (in shares) at Sep. 30, 2022 59,860 59,860    
Beginning Balance at Sep. 30, 2022 $ 2,468,978 $ 91,048 (26,176) 2,404,106
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   39    
Exercise of employee stock options 1,029 $ 1,029    
Issuance of stock under employee stock purchase plan (in shares)   500    
Issuance of stock under employee stock purchase plan 58,468 $ 58,468    
Issuance of restricted stock (in shares)   1,051    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (2,075)    
Repurchase of common stock (290,041) $ (290,041)    
Taxes paid related to net share settlement of equity awards (in shares)   (79)    
Taxes paid related to net share settlement of equity awards (11,369) $ (11,369)    
Stock-based compensation 183,384 $ 183,384    
Net income 242,814     242,814
Other comprehensive income (loss) $ 4,240   4,240  
Ending Balance ( in shares) at Jun. 30, 2023 59,296 59,296    
Ending Balance at Jun. 30, 2023 $ 2,657,503 $ 32,519 (21,936) 2,646,920
Beginning Balance (in shares) at Mar. 31, 2023   60,465    
Beginning Balance at Mar. 31, 2023 2,725,559 $ 190,592 (22,977) 2,557,944
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   13    
Exercise of employee stock options 313 $ 313    
Issuance of stock under employee stock purchase plan (in shares)   321    
Issuance of stock under employee stock purchase plan 36,723 $ 36,723    
Issuance of restricted stock (in shares)   320    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (1,812)    
Repurchase of common stock (250,036) $ (250,036)    
Taxes paid related to net share settlement of equity awards (in shares)   (11)    
Taxes paid related to net share settlement of equity awards (1,545) $ (1,545)    
Stock-based compensation 56,472 $ 56,472    
Net income 88,976     88,976
Other comprehensive income (loss) $ 1,041   1,041  
Ending Balance ( in shares) at Jun. 30, 2023 59,296 59,296    
Ending Balance at Jun. 30, 2023 $ 2,657,503 $ 32,519 $ (21,936) $ 2,646,920