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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 |  |  |

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