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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional paid in capital
Retained earnings
Accumulated other comprehensive loss
Treasury Stock
Beginning Balance at May. 31, 2012 $ 523,306          
Net income (1,051)          
Ending Balance at May. 31, 2013 526,324 $ 351 $ 500,554 $ 28,616 $ (1,093) $ (2,104)
Ending Balance, Shares at May. 31, 2013   35,060,351       (142,305)
Net income 2,347     2,347    
Exercise of stock options 1,085   1,085      
Tax effect of exercise of stock options (146)   (146)      
Exercise of stock options, Shares   105,676        
Issuance of restricted shares, net (1,357) $ 1 (1,358)      
Issuance of restricted shares, net, Shares   129,702        
Purchase of common stock under Employee Stock Purchase Plan 2,718 $ 1 2,717      
Purchase of common stock under Employee Stock Purchase Plan, Shares   146,275        
Stock-based compensation 5,502   5,502      
Other comprehensive income (loss), net of tax 412       412  
Ending Balance at May. 31, 2014 536,885 $ 353 508,354 30,963 (681) $ (2,104)
Ending Balance, Shares at May. 31, 2014   35,442,004       (142,305)
Net income 284          
Other comprehensive income (loss), net of tax 63          
Ending Balance at Aug. 31, 2014 539,585          
Beginning Balance at May. 31, 2014 536,885 $ 353 508,354 30,963 (681) $ (2,104)
Beginning Balance, Shares at May. 31, 2014   35,442,004       (142,305)
Net income 1,353          
Other comprehensive income (loss), net of tax (2)          
Ending Balance at Nov. 30, 2014 543,239          
Beginning Balance at May. 31, 2014 536,885 $ 353 508,354 30,963 (681) $ (2,104)
Beginning Balance, Shares at May. 31, 2014   35,442,004       (142,305)
Net income (2,800)          
Other comprehensive income (loss), net of tax (517)          
Ending Balance at Feb. 28, 2015 543,570          
Beginning Balance at May. 31, 2014 536,885 $ 353 508,354 30,963 (681) $ (2,104)
Beginning Balance, Shares at May. 31, 2014   35,442,004       (142,305)
Net income (3,388)     (3,388)    
Exercise of stock options 4,338 $ 3 4,335      
Exercise of stock options, Shares   341,446        
Issuance of restricted shares, net 2 $ 2        
Issuance of restricted shares, net, Shares   141,274        
Purchase of common stock under Employee Stock Purchase Plan 1,416 $ 2 1,414      
Purchase of common stock under Employee Stock Purchase Plan, Shares   119,001        
Stock-based compensation 5,998   5,998      
Other comprehensive income (loss), net of tax (152)       (152)  
Ending Balance at May. 31, 2015 545,099 $ 360 520,101 27,575 (833) $ (2,104)
Ending Balance, Shares at May. 31, 2015   36,043,725       (142,305)
Beginning Balance at Aug. 31, 2014 539,585          
Net income 1,069          
Other comprehensive income (loss), net of tax (64)          
Ending Balance at Nov. 30, 2014 543,239          
Net income (4,153)          
Other comprehensive income (loss), net of tax (514)          
Ending Balance at Feb. 28, 2015 543,570          
Net income (588)          
Ending Balance at May. 31, 2015 545,099 $ 360 520,101 27,575 (833) $ (2,104)
Ending Balance, Shares at May. 31, 2015   36,043,725       (142,305)
Net income (775)          
Ending Balance at Aug. 31, 2015 547,182          
Beginning Balance at May. 31, 2015 545,099 $ 360 520,101 27,575 (833) $ (2,104)
Beginning Balance, Shares at May. 31, 2015   36,043,725       (142,305)
Net income (1,109)          
Ending Balance at Nov. 30, 2015 547,726          
Beginning Balance at May. 31, 2015 545,099 $ 360 520,101 27,575 (833) $ (2,104)
Beginning Balance, Shares at May. 31, 2015   36,043,725       (142,305)
Net income (515)          
Ending Balance at Feb. 29, 2016 550,796          
Beginning Balance at May. 31, 2015 545,099 $ 360 520,101 27,575 (833) $ (2,104)
Beginning Balance, Shares at May. 31, 2015   36,043,725       (142,305)
Net income (43,590)     (43,590)    
Exercise of stock options $ 1,297 $ 1 1,296      
Exercise of stock options, Shares 145,260 101,040        
Issuance of restricted shares, net $ (331) $ 1 (332)      
Issuance of restricted shares, net, Shares   137,681        
Purchase of common stock under Employee Stock Purchase Plan 1,471 $ 1 1,470      
Purchase of common stock under Employee Stock Purchase Plan, Shares   137,957        
Stock-based compensation 3,240   3,240      
Other comprehensive income (loss), net of tax 42       42  
Ending Balance at May. 31, 2016 507,228 $ 363 525,775 (16,015) (791) $ (2,104)
Ending Balance, Shares at May. 31, 2016   36,420,403       (142,305)
Beginning Balance at Aug. 31, 2015 547,182          
Net income (334)          
Ending Balance at Nov. 30, 2015 547,726          
Net income 594          
Ending Balance at Feb. 29, 2016 550,796          
Net income (43,075)          
Ending Balance at May. 31, 2016 $ 507,228 $ 363 $ 525,775 $ (16,015) $ (791) $ (2,104)
Ending Balance, Shares at May. 31, 2016   36,420,403       (142,305)