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Net Income Per Common Share (Narrative) (Detail) - $ / shares
shares in Thousands
1 Months Ended 3 Months Ended
Dec. 21, 2016
Sep. 30, 2018
Sep. 30, 2017
Nov. 30, 2015
Net Income Per Common Share [Line Items]        
Number of shares issued in connection with acquisition included in weighted average shares outstanding   5,122 5,122  
Common equivalent shares excluded from computation of earnings per share due to net loss   35 61  
Antidilutive securities excluded from computation of earnings per share   1,171    
Citron and Lucid        
Net Income Per Common Share [Line Items]        
Number of shares issued in connection with acquisition included in weighted average shares outstanding 5,122   5,122  
Convertible Senior Notes        
Net Income Per Common Share [Line Items]        
Senior notes, initial conversion price per share       $ 33.215