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Consolidated Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Cash provided (used) by operating activities:    
Net income $ 46,440 $ 48,198
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization 17,795 13,691
Provision for doubtful receivables (54) 225
Share-based compensation 3,129 1,163
Gain on the sale of property and equipment (15) (84)
Unrealized loss on investments   756
Deferred income taxes and tax credits (5,231) 3,114
Changes in operating capital:    
Receivables (12,947) (12,411)
Inventories (72,450) (40,380)
Prepaid expenses and other current assets (674) (3,382)
Other assets and liabilities, net (390) (796)
Accounts payable 36,611 31,394
Accrued expenses and other current liabilities (8,544) (13,994)
Accrued income taxes 7,083 1,792
Net cash provided by operating activities 10,753 29,286
Cash provided (used) by investing activities:    
Capital and intangible asset expenditures (5,760) (6,979)
Proceeds from the sale of property and equipment 20 1,438
Proceeds from note receivable related to land sale 737  
Proceeds from sale of investments   3,100
Net cash used by investing activities (5,003) (2,441)
Cash provided (used) by financing activities:    
Proceeds from line of credit 114,950 485,500
Repayment of line of credit (125,050) (451,500)
Repayments of long-term debt (3,000) (53,000)
Payments of financing costs (28) (25)
Proceeds from exercise of stock options and employee stock purchases, including tax benefits 6,913 2,619
Directors' stock repurchased (72)  
Payment of tax obligations resulting from cashless option exercise   (12,546)
Share-based compensation tax benefit 458 52
Net cash used by financing activities (5,829) (28,900)
Net decrease in cash and cash equivalents (79) (2,055)
Cash and cash equivalents, beginning balance 21,846 27,193
Cash and cash equivalents, ending balance $ 21,767 $ 25,138