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Consolidated Statement Of Stockholders' Equity And Comprehensive Income (USD $)
In Thousands, except Share data
Common Stock [Member]
Additional Paid In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Comprehensive Income [Member]
Total
Balance at May. 31, 2011 $ 250 $ 371,393 $ 35,269 $ (1,273)   $ 405,639
Balance, shares at May. 31, 2011 24,985,657          
Net income     1,373   1,373 1,373
Exercise of stock options 1 1,204       1,205
Exercise of stock options, shares 117,291          
Purchase of common stock under ESPP 1 600       601
Purchase of common stock under ESPP, shares 49,024          
Issuance/Cancellation of performance shares 33,457          
Tax effect of exercise of stock options   (240)       (240)
Stock based compensation   799       799
Unrealized loss on marketable securities, net of tax of $23       (39) (39) (39)
Unrealized loss on interest rate swap, net of tax of $22       (37) (37) (37)
Comprehensive income         1,297  
Balance at Aug. 31, 2011 $ 252 $ 373,756 $ 36,642 $ (1,349)   $ 409,301
Balance, shares at Aug. 31, 2011 25,185,429