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Quarterly Information Quarterly Information (unaudited) Statement of Immaterial Errors (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
Feb. 28, 2014
May 31, 2014
May 31, 2013
May 31, 2012
Cost of sales   $ 43,277               $ 174,594 $ 173,037 $ 95,829
Gross profit 47,531 44,918 44,930 42,482 44,241 41,201 44,088 39,459   179,861 168,989 125,958
Operating income   6,852               13,448 7,094 (2,962)
Income before income tax provision   4,867               6,380 (643) (5,282)
Income tax expense   176               3,292 (31) (188)
Net income (1,078) 4,691 (99) (426) (868) (992) 1,969 (721) 4,691 3,088 (612) (5,094)
Income per common share $ (0.03) $ 0.14 $ 0.00 $ (0.01) $ (0.03) $ (0.03) $ 0.06 $ (0.02)   $ 0.09 $ (0.02) $ (0.20)
Income per diluted share $ (0.03) $ 0.13 $ 0.00 $ (0.01) $ (0.03) $ (0.03) $ 0.06 $ (0.02)   $ 0.09 $ (0.02) $ (0.20)
Inventory, net 61,056 59,117     55,062       59,117 61,056 55,062  
Income taxes payable 689 579     0       579 689 0  
Change in inventories                 (3,508) (5,447) (1,909) (1,522)
Accounts payable, accrued and other liabilities                 2,399 7,245 (10,039) 6,673
Net cash provided by operating activities                 15,174 25,280 26,883 11,497
As Previously Reported
                        
Cost of sales   42,560                    
Gross profit   45,635                    
Operating income   7,569                    
Income before income tax provision   5,584                    
Income tax expense   476                    
Net income   5,108             5,108      
Income per common share   $ 0.15                    
Income per diluted share   $ 0.14                    
Inventory, net   59,834             59,834      
Income taxes payable   879             879      
Change in inventories                 (4,225)      
Accounts payable, accrued and other liabilities                 2,699      
Net cash provided by operating activities                 15,174      
Adjustments
                        
Cost of sales   717                    
Gross profit   (717)                    
Operating income   (717)                    
Income before income tax provision   (717)                    
Income tax expense   (300)                    
Net income   (417)             (417)      
Income per common share   $ (0.01)                    
Income per diluted share   $ (0.01)                    
Inventory, net   (717)             (717)      
Income taxes payable   (300)             (300)      
Change in inventories                 717      
Accounts payable, accrued and other liabilities                 (300)      
Net cash provided by operating activities                 $ 0