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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, 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]          
Net income 155,488       155,488
Other comprehensive income (loss), net of tax (6,076)     (6,076)  
Exercise of stock options (in shares)   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]          
Net income 68,699       68,699
Other comprehensive income (loss), net of tax (130)     (130)  
Exercise of stock options (in shares)   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)   0
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
Beginning balance (in shares) at Feb. 29, 2020   25,194,000      
Beginning balance at Feb. 29, 2020 1,161,723 $ 2,519 268,043 (7,005) 898,166
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 231,774       231,774
Other comprehensive income (loss), net of tax $ (5,280)     (5,280)  
Exercise of stock options (in shares) 13,540 13,000      
Exercise of stock options $ 917 $ 2 915    
Net issuance and settlement of restricted stock (in shares)   189,000      
Net issuance and settlement of restricted stock 0 $ 19 (19)    
Issuance of common stock related to stock purchase plan (in shares)   27,000      
Issuance of common stock related to stock purchase plan 3,611 $ 2 3,609    
Common stock repurchased and retired (in shares)   (1,029,000)      
Common stock repurchased and retired (202,961) $ (103) (15,913)   (186,945)
Share-based compensation 20,654   20,654    
Ending balance (in shares) at Nov. 30, 2020   24,394,000      
Ending balance at Nov. 30, 2020 1,210,438 $ 2,439 277,289 (12,285) 942,995
Beginning balance (in shares) at Aug. 31, 2020   25,328,000      
Beginning balance at Aug. 31, 2020 1,308,529 $ 2,533 274,643 (14,320) 1,045,673
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 84,155       84,155
Other comprehensive income (loss), net of tax $ 2,035     2,035  
Exercise of stock options (in shares) 850 1,000      
Exercise of stock options $ 70 $ 0 70    
Net issuance and settlement of restricted stock (in shares)   20,000      
Net issuance and settlement of restricted stock 0 $ 2 (2)    
Issuance of common stock related to stock purchase plan (in shares)   12,000      
Issuance of common stock related to stock purchase plan 1,710 $ 1 1,709    
Common stock repurchased and retired (in shares)   (967,000)      
Common stock repurchased and retired (192,800) $ (97) (5,870)   (186,833)
Share-based compensation 6,739   6,739    
Ending balance (in shares) at Nov. 30, 2020   24,394,000      
Ending balance at Nov. 30, 2020 $ 1,210,438 $ 2,439 $ 277,289 $ (12,285) $ 942,995