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Consolidated Statements of Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Beginning Balance at May. 31, 2018 $ 560,175 $ 8,278 $ 202,572 $ (9,746) $ 359,071
Beginning Balance (in shares) at May. 31, 2018   51,736,000      
Issuance of shares under share-based compensation plan 8,473 $ 40 8,433    
Issuance of shares under share-based compensation plan (in shares)   251,000      
Issuance of shares under employee stock purchase plan 519 $ 2 517    
Issuance of shares under employee stock purchase plan (in shares)   8,000      
Net income 15,237       15,237
Other comprehensive income (loss) (2,778)     (2,778)  
Ending Balance at Aug. 31, 2018 581,626 $ 8,320 211,522 (12,524) 374,308
Ending Balance (in shares) at Aug. 31, 2018   51,995,000      
Beginning Balance at May. 31, 2018 560,175 $ 8,278 202,572 (9,746) 359,071
Beginning Balance (in shares) at May. 31, 2018   51,736,000      
Net income 44,361        
Ending Balance at Feb. 28, 2019 619,916 $ 8,339 217,274 (9,129) 403,432
Ending Balance (in shares) at Feb. 28, 2019   52,120,000      
Beginning Balance at Aug. 31, 2018 581,626 $ 8,320 211,522 (12,524) 374,308
Beginning Balance (in shares) at Aug. 31, 2018   51,995,000      
Issuance of shares under share-based compensation plan 4,107 $ 14 4,093    
Issuance of shares under share-based compensation plan (in shares)   87,000      
Net income 16,051       16,051
Other comprehensive income (loss) 290     290  
Ending Balance at Nov. 30, 2018 602,074 $ 8,334 215,615 (12,234) 390,359
Ending Balance (in shares) at Nov. 30, 2018   52,082,000      
Issuance of shares under share-based compensation plan 4,158 $ 12 4,146    
Issuance of shares under share-based compensation plan (in shares)   78,000      
Issuance of shares under employee stock purchase plan 641 $ 1 640    
Issuance of shares under employee stock purchase plan (in shares)   10,000      
Shares repurchased (3,135) $ (8) (3,127)    
Shares repurchased (in shares)   (50,000)      
Net income 13,073       13,073
Other comprehensive income (loss) 3,105     3,105  
Ending Balance at Feb. 28, 2019 619,916 $ 8,339 217,274 (9,129) 403,432
Ending Balance (in shares) at Feb. 28, 2019   52,120,000      
Beginning Balance at May. 31, 2019 $ 637,899 $ 8,355 221,937 (11,640) 419,247
Beginning Balance (in shares) at May. 31, 2019 52,216,589 52,217,000      
Issuance of shares under share-based compensation plan $ 9,713 $ 30 9,683    
Issuance of shares under share-based compensation plan (in shares)   196,000      
Issuance of shares under employee stock purchase plan 538 $ 2 536    
Issuance of shares under employee stock purchase plan (in shares)   10,000      
Net income 14,652       14,652
Other comprehensive income (loss) (2,496)     (2,496)  
Ending Balance at Aug. 31, 2019 660,306 $ 8,387 232,156 (14,136) 433,899
Ending Balance (in shares) at Aug. 31, 2019   52,423,000      
Beginning Balance at May. 31, 2019 $ 637,899 $ 8,355 221,937 (11,640) 419,247
Beginning Balance (in shares) at May. 31, 2019 52,216,589 52,217,000      
Net income $ 43,128        
Ending Balance at Feb. 29, 2020 $ 711,871 $ 8,466 254,537 (13,507) 462,375
Ending Balance (in shares) at Feb. 29, 2020 52,910,832 52,911,000      
Beginning Balance at Aug. 31, 2019 $ 660,306 $ 8,387 232,156 (14,136) 433,899
Beginning Balance (in shares) at Aug. 31, 2019   52,423,000      
Issuance of shares under share-based compensation plan 12,117 $ 47 12,070    
Issuance of shares under share-based compensation plan (in shares)   288,000      
Net income 16,276       16,276
Other comprehensive income (loss) 2,218     2,218  
Ending Balance at Nov. 30, 2019 690,917 $ 8,434 244,226 (11,918) 450,175
Ending Balance (in shares) at Nov. 30, 2019   52,711,000      
Issuance of shares under share-based compensation plan 9,736 $ 31 9,705    
Issuance of shares under share-based compensation plan (in shares)   188,000      
Issuance of shares under employee stock purchase plan 607 $ 1 606    
Issuance of shares under employee stock purchase plan (in shares)   12,000      
Net income 12,200       12,200
Other comprehensive income (loss) (1,589)     (1,589)  
Ending Balance at Feb. 29, 2020 $ 711,871 $ 8,466 $ 254,537 $ (13,507) $ 462,375
Ending Balance (in shares) at Feb. 29, 2020 52,910,832 52,911,000