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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid in Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Beginning balance (in shares) at Feb. 29, 2020   25,194      
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 60,286       60,286
Other comprehensive income (loss), net of tax (1,912)     (1,912)  
Exercise of stock options (in shares)   8      
Exercise of stock options 476 $ 1 475    
Net issuance and settlement of restricted stock (in shares)   165      
Issuance and settlement of restricted stock 0 $ 17 (17)    
Issuance of common stock related to stock purchase plan (in shares)   15      
Issuance of common stock related to stock purchase plan 1,901 $ 1 1,900    
Common stock repurchased and retired (in shares)   (61)      
Common stock repurchased and retired (10,013) $ (6) (9,895)   (112)
Share-based compensation 9,291   9,291    
Ending balance (in shares) at May. 31, 2020   25,321      
Ending balance at May. 31, 2020 1,221,752 $ 2,532 269,797 (8,917) 958,340
Beginning balance (in shares) at Feb. 29, 2020   25,194      
Beginning balance at Feb. 29, 2020 1,161,723 $ 2,519 268,043 (7,005) 898,166
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Other comprehensive income (loss), net of tax (5,280)        
Ending balance (in shares) at Nov. 30, 2020   24,394      
Ending balance at Nov. 30, 2020 1,210,438 $ 2,439 277,289 (12,285) 942,995
Beginning balance (in shares) at May. 31, 2020   25,321      
Beginning balance at May. 31, 2020 1,221,752 $ 2,532 269,797 (8,917) 958,340
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 87,333       87,333
Other comprehensive income (loss), net of tax (5,403)     (5,403)  
Exercise of stock options (in shares)   4      
Exercise of stock options 371 $ 1 370    
Net issuance and settlement of restricted stock (in shares)   4      
Common stock repurchased and retired (in shares)   (1)      
Common stock repurchased and retired (148)   (148)    
Share-based compensation 4,624   4,624    
Ending balance (in shares) at Aug. 31, 2020   25,328      
Ending 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)   1      
Exercise of stock options 70   70    
Net issuance and settlement of restricted stock (in shares)   20      
Issuance and settlement of restricted stock 0 $ 2 (2)    
Issuance of common stock related to stock purchase plan (in shares)   12      
Issuance of common stock related to stock purchase plan 1,710 $ 1 1,709    
Common stock repurchased and retired (in shares)   (967)      
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      
Ending balance at Nov. 30, 2020 1,210,438 $ 2,439 277,289 (12,285) 942,995
Beginning balance (in shares) at Feb. 28, 2021   24,406      
Beginning balance at Feb. 28, 2021 1,239,347 $ 2,441 283,396 (11,656) 965,166
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 56,972       56,972
Other comprehensive income (loss), net of tax (797)     (797)  
Exercise of stock options (in shares)   4      
Exercise of stock options 275   275    
Net issuance and settlement of restricted stock (in shares)   177      
Issuance and settlement of restricted stock 0 $ 18 (18)    
Issuance of common stock related to stock purchase plan (in shares)   13      
Issuance of common stock related to stock purchase plan 2,338 $ 1 2,337    
Common stock repurchased and retired (in shares)   (502)      
Common stock repurchased and retired (110,074) $ (50) (16,616)   (93,408)
Share-based compensation 14,020   14,020    
Ending balance (in shares) at May. 31, 2021   24,098      
Ending balance at May. 31, 2021 1,202,081 $ 2,410 283,394 (12,453) 928,730
Beginning balance (in shares) at Feb. 28, 2021   24,406      
Beginning balance at Feb. 28, 2021 1,239,347 $ 2,441 283,396 (11,656) 965,166
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Other comprehensive income (loss), net of tax 10,590        
Ending balance (in shares) at Nov. 30, 2021   24,136      
Ending balance at Nov. 30, 2021 1,354,958 $ 2,414 298,708 (1,066) 1,054,902
Beginning balance (in shares) at May. 31, 2021   24,098      
Beginning balance at May. 31, 2021 1,202,081 $ 2,410 283,394 (12,453) 928,730
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 51,315       51,315
Other comprehensive income (loss), net of tax 6,242     6,242  
Exercise of stock options (in shares)   6      
Exercise of stock options 520 $ 1 519    
Net issuance and settlement of restricted stock (in shares)   2      
Issuance and settlement of restricted stock 0 $ 0 0    
Common stock repurchased and retired (in shares)   (1)      
Common stock repurchased and retired (116) $ 0 (104)   (12)
Share-based compensation 7,780   7,780    
Ending balance (in shares) at Aug. 31, 2021   24,105      
Ending balance at Aug. 31, 2021 1,267,822 $ 2,411 291,589 (6,211) 980,033
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 75,683       75,683
Other comprehensive income (loss), net of tax 5,145     5,145  
Exercise of stock options (in shares)   11      
Exercise of stock options 665 $ 1 664    
Net issuance and settlement of restricted stock (in shares)   22      
Issuance and settlement of restricted stock 0 $ 2 (2)    
Issuance of common stock related to stock purchase plan (in shares)   10      
Issuance of common stock related to stock purchase plan 1,923 $ 1 1,922    
Common stock repurchased and retired (in shares)   (12)      
Common stock repurchased and retired (2,829) $ (1) (2,014)   (814)
Share-based compensation 6,549   6,549    
Ending balance (in shares) at Nov. 30, 2021   24,136      
Ending balance at Nov. 30, 2021 $ 1,354,958 $ 2,414 $ 298,708 $ (1,066) $ 1,054,902