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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Beginning balance (in shares) at Feb. 28, 2018   26,576,000      
Beginning balance at Feb. 28, 2018 $ 1,014,459 $ 2,658 $ 230,676 $ 631 $ 780,494
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Income from continuing operations 136,510       136,510
Loss from discontinued operations (5,231)       (5,231)
Other comprehensive income, net of tax 4,576     4,576  
Exercise of stock options (in shares)   121,000      
Exercise of stock options 6,081 $ 12 6,069    
Net issuance and settlement of restricted stock (in shares)   144,000      
Net issuance and settlement of restricted stock 0 $ 14 (14)    
Issuance of common stock related to stock purchase plan (in shares)   31,000      
Issuance of common stock related to stock purchase plan 2,412 $ 3 2,409    
Common stock repurchased and retired (in shares)   (1,279,000)      
Common stock repurchased and retired (142,415) $ (127) (11,273)   (131,015)
Share-based compensation 17,029   17,029    
Ending balance (in shares) at Nov. 30, 2018   25,593,000      
Ending balance at Nov. 30, 2018 1,033,258 $ 2,534 244,888 5,207 780,629
Beginning balance (in shares) at Aug. 31, 2018   26,380,000      
Beginning balance at Aug. 31, 2018 1,075,740 $ 2,635 241,633 4,647 826,825
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Income from continuing operations 54,320       54,320
Loss from discontinued operations (4,850)        
Other comprehensive income, net of tax 560     560  
Exercise of stock options (in shares)   10,000      
Exercise of stock options 566 $ 1 565    
Net issuance and settlement of restricted stock (in shares)   4,000      
Net issuance and settlement of restricted stock 0        
Issuance of common stock related to stock purchase plan (in shares)   14,000      
Issuance of common stock related to stock purchase plan 1,077 $ 1 1,076    
Common stock repurchased and retired (in shares)   (815,000)      
Common stock repurchased and retired (100,175) $ (81) (4,396)   (95,698)
Share-based compensation 6,016   6,016    
Ending balance (in shares) at Nov. 30, 2018   25,593,000      
Ending balance at Nov. 30, 2018 1,033,258 $ 2,534 244,888 5,207 780,629
Beginning balance (in shares) at Feb. 28, 2019   24,946,000      
Beginning balance at Feb. 28, 2019 996,637 $ 2,495 246,585 1,191 746,366
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Income from continuing operations 155,488       155,488
Other comprehensive income, net of tax $ (6,076)     (6,076)  
Exercise of stock options (in shares) 68,657 69,000      
Exercise of stock options $ 4,190 $ 7 4,183    
Net issuance and settlement of restricted stock (in shares)   199,000      
Net issuance and settlement of restricted stock 0 $ 21 (21)    
Issuance of common stock related to stock purchase plan (in shares)   30,000      
Issuance of common stock related to stock purchase plan 2,835 $ 2 2,833    
Common stock repurchased and retired (in shares)   (77,000)      
Common stock repurchased and retired (10,133) $ (8) (9,592)   (533)
Share-based compensation 18,743   18,743    
Ending balance (in shares) at Nov. 30, 2019   25,167,000      
Ending balance at Nov. 30, 2019 1,161,684 $ 2,517 262,731 (4,885) 901,321
Beginning balance (in shares) at Aug. 31, 2019   25,130,000      
Beginning balance at Aug. 31, 2019 1,087,375 $ 2,513 256,995 (4,755) 832,622
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Income from continuing operations 68,699       68,699
Loss from discontinued operations         (4,850)
Other comprehensive income, net of tax $ (130)     (130)  
Exercise of stock options (in shares) 6,892 7,000      
Exercise of stock options $ 557 $ 1 556    
Net issuance and settlement of restricted stock (in shares)   21,000      
Net issuance and settlement of restricted stock 0 $ 3 (3)    
Issuance of common stock related to stock purchase plan (in shares)   15,000      
Issuance of common stock related to stock purchase plan 1,427 $ 1 1,426    
Common stock repurchased and retired (in shares)   (6,000)      
Common stock repurchased and retired (1,002) $ (1) (1,001)    
Share-based compensation 4,758   4,758    
Ending balance (in shares) at Nov. 30, 2019   25,167,000      
Ending balance at Nov. 30, 2019 $ 1,161,684 $ 2,517 $ 262,731 $ (4,885) $ 901,321