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Consolidated Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Cash provided (used) by operating activities:    
Net income $ 84,159 $ 81,077
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization 26,591 21,066
Provision for doubtful receivables 114 605
Share-based compensation 4,417 2,231
(Gain) loss on the sale of property and equipment 43 (95)
Realized loss on investments   697
Deferred income taxes and tax credits (10,906) 5,041
Changes in operating capital:    
Receivables (62,955) (41,363)
Inventories (60,052) (34,530)
Prepaid expenses and other current assets (512) (1,071)
Other assets and liabilities, net (469) 128
Accounts payable 16,414 23,327
Accrued expenses and other current liabilities 20,574 (1,488)
Accrued income taxes 6,909 548
Net cash provided by operating activities 24,327 56,173
Cash provided (used) by investing activities:    
Capital and intangible asset expenditures (6,405) (11,238)
Proceeds from the sale of property and equipment 26 1,534
Proceeds from note receivable related to land sale 737  
Proceeds from sale of investments   22,421
Net cash provided (used) by investing activities (5,642) 12,717
Cash provided (used) by financing activities:    
Proceeds from line of credit 184,950 809,450
Repayment of line of credit (212,650) (810,450)
Repayments of long-term debt (3,000) (53,000)
Payments of financing costs (28) (25)
Proceeds from share issuances under share-based compensation plans, including tax benefits 7,417 5,831
Common shares repurchased on the open market (1,759)  
Payment of tax obligations resulting from cashless option exercise   (12,546)
Share-based compensation tax benefit 661 76
Net cash used by financing activities (24,409) (60,664)
Net increase in cash and cash equivalents (5,724) 8,226
Cash and cash equivalents, beginning balance 21,846 27,193
Cash and cash equivalents, ending balance $ 16,122 $ 35,419