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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, 2020   61,099    
Beginning Balance at Sep. 30, 2020 $ 2,232,268 $ 305,453 $ (18,716) $ 1,945,531
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   83    
Exercise of employee stock options 2,610 $ 2,610    
Issuance of stock under employee stock purchase plan (in shares)   231    
Issuance of stock under employee stock purchase plan 26,077 $ 26,077    
Issuance of restricted stock (in shares)   742    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (2,052)    
Repurchase of common stock (400,000) $ (311,056)   (88,944)
Adjustments To Additional Paid In Capital, Equity Forward Contract (100,000) $ (100,000)    
Cost of Issuance of Treasury Stock, Shares   (51)    
Taxes paid related to net share settlement of equity awards (7,928) $ (7,928)    
Stock-based compensation 124,351 $ 124,351    
Net income 130,919     130,919
Other comprehensive loss (478)   (478)  
Ending Balance ( in shares) at Mar. 31, 2021   60,052    
Ending Balance at Mar. 31, 2021 2,007,819 $ 39,507 (19,194) 1,987,506
Beginning Balance (in shares) at Dec. 31, 2020   61,632    
Beginning Balance at Dec. 31, 2020 2,401,590 $ 386,236 (17,855) 2,033,209
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   44    
Exercise of employee stock options 1,492 $ 1,492    
Issuance of restricted stock (in shares)   445    
Issuance of restricted stock 0      
Repurchase of common stock (in shares)   (2,052)    
Repurchase of common stock (400,000) $ (311,056)   (88,944)
Adjustments To Additional Paid In Capital, Equity Forward Contract (100,000) $ (100,000)    
Cost of Issuance of Treasury Stock, Shares   (17)    
Taxes paid related to net share settlement of equity awards (3,447) $ (3,447)    
Stock-based compensation 66,282 $ 66,282    
Net income 43,241     43,241
Other comprehensive loss (1,339)   (1,339)  
Ending Balance ( in shares) at Mar. 31, 2021   60,052    
Ending Balance at Mar. 31, 2021 $ 2,007,819 $ 39,507 (19,194) 1,987,506
Beginning Balance (in shares) at Sep. 30, 2021 60,652 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 loss $ (2,555)   (2,555)  
Ending Balance ( in shares) at Mar. 31, 2022 60,465 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 loss $ (1,413)   (1,413)  
Ending Balance ( in shares) at Mar. 31, 2022 60,465 60,465    
Ending Balance at Mar. 31, 2022 $ 2,397,128 $ 82,133 $ (22,628) $ 2,337,623