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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Paid-in Capital
Accumulated Deficit
Beginning balance (in shares) at Sep. 30, 2018   33,522    
Beginning balance at Sep. 30, 2018 $ 644,027 $ 34 $ 880,025 $ (236,032)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income (loss) (93,551)     (93,551)
Stock-based compensation expense 4,294   4,294  
Exercises of stock options (in shares)   27    
Exercises of stock options 278   278  
Shares issued under employee stock plans, net (in shares)   910    
Forfeiture and other settlements of restricted stock (in shares)   (30)    
Common stock redeemed for tax liability (in shares)   (179)    
Common stock redeemed for tax liability $ (1,886)   (1,886)  
Share repurchases (in shares) (2,200) (2,206)    
Share repurchases $ (24,004) $ (2) (24,002)  
Ending balance (in shares) at Mar. 31, 2019   32,044    
Ending balance at Mar. 31, 2019 529,158 $ 32 858,709 (329,583)
Beginning balance (in shares) at Sep. 30, 2018   33,522    
Beginning balance at Sep. 30, 2018 644,027 $ 34 880,025 (236,032)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share repurchases (34,600)      
Ending balance (in shares) at Sep. 30, 2019   30,933    
Ending balance at Sep. 30, 2019 538,754 $ 31 854,275 (315,552)
Beginning balance (in shares) at Dec. 31, 2018   32,675    
Beginning balance at Dec. 31, 2018 635,109 $ 33 863,797 (228,721)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income (loss) (100,862)     (100,862)
Stock-based compensation expense 2,180   2,180  
Exercises of stock options (in shares)   26    
Exercises of stock options 271   271  
Forfeiture and other settlements of restricted stock (in shares)   (2)    
Common stock redeemed for tax liability (in shares)   (3)    
Common stock redeemed for tax liability (35)   (35)  
Share repurchases (in shares)   (652)    
Share repurchases (7,505) $ (1) (7,504)  
Ending balance (in shares) at Mar. 31, 2019   32,044    
Ending balance at Mar. 31, 2019 529,158 $ 32 858,709 (329,583)
Beginning balance (in shares) at Sep. 30, 2019   30,933    
Beginning balance at Sep. 30, 2019 538,754 $ 31 854,275 (315,552)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income (loss) 13,360     13,360
Stock-based compensation expense 3,210   3,210  
Exercises of stock options (in shares)   50    
Exercises of stock options 204   204  
Shares issued under employee stock plans, net (in shares)   581    
Forfeiture and other settlements of restricted stock (in shares)   (11)    
Forfeiture and other settlements of restricted stock (2,058)   (2,058)  
Common stock redeemed for tax liability (in shares)   (171)    
Common stock redeemed for tax liability (2,661)   (2,661)  
Share repurchases (in shares)   (362)    
Share repurchases (3,327)   (3,327)  
Ending balance (in shares) at Mar. 31, 2020   31,020    
Ending balance at Mar. 31, 2020 547,482 $ 31 849,643 (302,192)
Beginning balance (in shares) at Dec. 31, 2019   31,383    
Beginning balance at Dec. 31, 2019 539,280 $ 31 852,055 (312,806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income (loss) 10,614     10,614
Stock-based compensation expense 899   899  
Exercises of stock options (in shares)   3    
Exercises of stock options 31   31  
Shares issued under employee stock plans, net (in shares)   7    
Forfeiture and other settlements of restricted stock (in shares)   (10)    
Common stock redeemed for tax liability (in shares)   (1)    
Common stock redeemed for tax liability $ (15)   (15)  
Share repurchases (in shares) (362) (362)    
Share repurchases $ (3,327)   (3,327)  
Ending balance (in shares) at Mar. 31, 2020   31,020    
Ending balance at Mar. 31, 2020 $ 547,482 $ 31 $ 849,643 $ (302,192)