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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 28, 2010
Cash provided (used) by operating activities:      
Net income $ 110,374 $ 93,305 $ 71,817
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation and amortization 30,178 18,502 15,261
Provision for doubtful receivables 548 865 448
Share-based compensation 2,928 2,017 1,744
Intangible asset impairment charges   2,161 900
(Gain) loss on the sale of property and equipment (537) 22 115
Realized and unrealized (gain) loss on investments 697 0 (417)
Write off of deferred finance costs due to early extinguishment of debt   92  
Deferred income taxes and tax credits 5,070 2,219 3,316
Changes in operating capital, net of effects of acquisition of businesses:      
Receivables (7,368) (166) (6,622)
Inventories (28,912) (26,049) 45,653
Prepaid expenses and other current assets (1,927) (75) 334
Other assets and liabilities, net 189 (917) (476)
Accounts payable (3,476) (8,130) 1,121
Accrued expenses and other current liabilities (4,874) 8,479 15,775
Accrued income taxes 990 (4,895) 3,130
Net cash provided by operating activities 103,880 87,430 152,099
Cash provided (used) by investing activities:      
Capital and intangible asset expenditures (16,051) (4,629) (7,715)
Proceeds from the sale of property and equipment 2,339 78 45
Note receivable from land sale (733)    
Payments to acquire investments     (9)
Proceeds from sale of investments 22,421 350 1,246
Payments to acquire businesses, net of cash received (160,000) (336,240) (60,000)
Net cash used by investing activities (152,024) (340,441) (66,433)
Cash provided (used) by financing activities:      
Proceeds from line of credit 1,369,850 94,000  
Repayment of line of credit (1,269,750) (23,000)  
Proceeds from issuance of long-term debt   100,000  
Repayments of long-term debt (53,000) (3,000) (78,000)
Payments of financing costs (499) (3,898)  
Proceeds from exercise of stock options and employee stock purchases, including tax benefits 8,688 7,594 7,365
Payment of tax obligations resulting from cashless option exercises (12,591)   (7,166)
Payments for repurchases of common stock   (1,799) (419)
Share-based compensation tax benefit 99 99 87
Net cash provided (used) by financing activities 42,797 169,996 (78,133)
Net increase (decrease) in cash and cash equivalents (5,347) (83,015) 7,533
Cash and cash equivalents, beginning balance 27,193 110,208 102,675
Cash and cash equivalents, ending balance 21,846 27,193 110,208
Supplemental cash flow information:      
Interest paid 12,719 8,632 10,781
Income taxes paid, net of refunds (797) 11,226 (2,913)
Value of common stock received as exercise price of options 27,482 226 23,261
Transfer of auction rate securities from non-current assets to investments $ 18,950