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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)   96    
Exercise of employee stock options 2,303 $ 2,303    
Issuance of stock under employee stock purchase plan (in shares)   169    
Issuance of stock under employee stock purchase plan 26,325 $ 26,325    
Issuance of restricted stock (in shares)   775    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (1,148)    
Repurchase of common stock (250,023) $ (250,023)    
Cost of Issuance of Treasury Stock, Shares   (79)    
Taxes paid related to net share settlement of equity awards (16,816) $ (16,816)    
Stock-based compensation 127,886 $ 127,886    
Net income 149,795     149,795
Other comprehensive income (2,555)   (2,555)  
Ending Balance ( in shares) at Mar. 31, 2022   60,465    
Ending Balance at Mar. 31, 2022 2,397,128 $ 82,133 (22,628) 2,337,623
Beginning Balance (in shares) at Dec. 31, 2021   60,711    
Beginning Balance at Dec. 31, 2021 2,405,361 $ 145,189 (21,215) 2,281,387
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   46    
Exercise of employee stock options 1,048 $ 1,048    
Issuance of restricted stock (in shares)   334    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (610)    
Repurchase of common stock (125,012) $ (125,012)    
Cost of Issuance of Treasury Stock, Shares   (16)    
Taxes paid related to net share settlement of equity awards (3,222) $ (3,222)    
Stock-based compensation 64,130 $ 64,130    
Net income 56,236     56,236
Other comprehensive income (1,413)   (1,413)  
Ending Balance ( in shares) at Mar. 31, 2022   60,465    
Ending Balance at Mar. 31, 2022 $ 2,397,128 $ 82,133 (22,628) 2,337,623
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)   26    
Exercise of employee stock options 716 $ 716    
Issuance of stock under employee stock purchase plan (in shares)   179    
Issuance of stock under employee stock purchase plan 21,745 $ 21,745    
Issuance of restricted stock (in shares)   731    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (263)    
Repurchase of common stock (40,005) $ (40,005)    
Cost of Issuance of Treasury Stock, Shares   (68)    
Taxes paid related to net share settlement of equity awards (9,825) $ (9,825)    
Stock-based compensation 126,913 $ 126,913    
Net income 153,838     153,838
Other comprehensive income $ 3,199   3,199  
Ending Balance ( in shares) at Mar. 31, 2023 60,465 60,465    
Ending Balance at Mar. 31, 2023 $ 2,725,559 $ 190,592 (22,977) 2,557,944
Beginning Balance (in shares) at Dec. 31, 2022   60,117    
Beginning Balance at Dec. 31, 2022 2,582,349 $ 129,060 (23,219) 2,476,508
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   12    
Exercise of employee stock options 281 $ 281    
Issuance of restricted stock (in shares)   355    
Issuance of restricted stock 0      
Repurchase of common stock 0      
Cost of Issuance of Treasury Stock, Shares   (19)    
Taxes paid related to net share settlement of equity awards (2,788) $ (2,788)    
Stock-based compensation 64,039 $ 64,039    
Net income 81,436     81,436
Other comprehensive income $ 242   242  
Ending Balance ( in shares) at Mar. 31, 2023 60,465 60,465    
Ending Balance at Mar. 31, 2023 $ 2,725,559 $ 190,592 $ (22,977) $ 2,557,944