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Consolidated Statement 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 51,735,732 51,736,000      
Issuance of shares under share-based compensation plan $ 8,473 $ 40 8,433 0 0
Issuance of shares under share-based compensation plan (in shares)   251,000      
Issuance of shares under employee stock purchase plan 519 $ 2 517 0 0
Issuance of shares under employee stock purchase plan (in shares)   8,000      
Net income 15,237 $ 0 0 0 15,237
Other comprehensive income (loss) (2,778) 0 0 (2,778) 0
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 51,735,732 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 52,120,422 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 0 0
Issuance of shares under share-based compensation plan (in shares)   87,000      
Net income 16,051 $ 0 0 0 16,051
Other comprehensive income (loss) 290 0 0 290 0
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 0 0
Issuance of shares under share-based compensation plan (in shares)   78,000      
Issuance of shares under employee stock purchase plan 641 $ 1 640 0 0
Issuance of shares under employee stock purchase plan (in shares)   10,000      
Shares repurchased (3,135) $ (8) (3,127) 0 0
Shares repurchased (in shares)   (50,000)      
Net income 13,073 $ 0 0 0 13,073
Other comprehensive income (loss) 3,105 0 0 3,105 0
Ending Balance at Feb. 28, 2019 $ 619,916 $ 8,339 $ 217,274 $ (9,129) $ 403,432
Ending Balance (in shares) at Feb. 28, 2019 52,120,422 52,120,000