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Consolidated Statement of Stockholders' Equity - 6 months ended Nov. 30, 2015 - USD ($)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock [Member]
Beginning Balance at May. 31, 2015 $ 545,022,000 $ 360,000 $ 520,101,000 $ 28,233,000 $ (1,568,000) $ (2,104,000)
Beginning Balance, Shares at May. 31, 2015   36,043,725        
Beginning Balance,Treasury Shares at May. 31, 2015 (142,305)          
Net income (loss) $ (1,119,000)     (1,119,000)    
Exercise of stock options 793,000 $ 1,000 792,000      
Exercise of stock options, Shares   52,578        
Purchase of common stock under ESPP 748,000 $ 1,000 747,000      
Purchase of common stock under ESPP, Shares   59,589        
Issuance of performance shares (311,000) $ 0 (311,000)      
Issuance of performance shares, Shares   129,665        
Stock based compensation 2,860,000   2,860,000      
Other comprehensive income, net of tax (354,000)       (354,000)  
Ending Balance at Nov. 30, 2015 $ 547,639,000 $ 362,000 $ 524,189,000 $ 27,114,000 $ (1,922,000) $ (2,104,000)
Ending Balance, Shares at Nov. 30, 2015   36,285,557        
Ending Balance,Treasury Shares at Nov. 30, 2015 (142,305)         (142,305.000)