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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 29, 2012
Cash provided (used) by operating activities:      
Net income $ 86,248 $ 115,666 $ 110,374
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 34,750 35,328 30,178
Provision for doubtful receivables 400 188 548
Non-cash share-based compensation 31,683 5,913 2,928
Intangible asset impairment charges 12,049    
(Gain) loss on the sale of property and equipment 81 175 (537)
Realized and unrealized loss on investments     697
Deferred income taxes and tax credits (10,109) (12,061) 5,070
Changes in operating capital, net of effects of acquisition of businesses:      
Receivables 6,265 (24,624) (7,368)
Inventories (8,383) (34,625) (28,912)
Prepaid expenses and other current assets 1,166 (1,545) (1,927)
Other assets and liabilities, net (1,867) (326) 189
Accounts payable 3,733 2,507 (3,476)
Accrued expenses and other current liabilities 8,129 1,360 (4,874)
Accrued income taxes (9,980) (398) 990
Net cash provided by operating activities 154,165 87,558 103,880
Cash provided (used) by investing activities:      
Capital and intangible asset expenditures (40,463) (14,688) (16,051)
Proceeds from the sale of property and equipment 5 26 2,339
Note receivable from land sale   737 (733)
Proceeds from sale of investments     22,421
Payment to acquire a business, net of cash received     (160,000)
Net cash used by investing activities (40,458) (13,925) (152,024)
Cash provided (used) by financing activities:      
Proceeds from line of credit 107,300 234,650 1,369,850
Repayment of line of credit (189,300) (323,750) (1,269,750)
Proceeds from issuance of long-term debt 37,607    
Repayment of long-term debt (20,000) (3,000) (53,000)
Payment of financing costs (367) (28) (499)
Proceeds from share issuances under share-based compensation plans, including tax benefits 10,285 10,392 8,688
Payment of tax obligations resulting from cashless share award exercises (6,445)   (12,591)
Payments for repurchases of common stock (1,311) (1,759)  
Share-based compensation tax benefit 5,709 858 99
Net cash provided (used) by financing activities (56,522) (82,637) 42,797
Net increase (decrease) in cash and cash equivalents 57,185 (9,004) (5,347)
Cash and cash equivalents, beginning balance 12,842 21,846 27,193
Cash and cash equivalents, ending balance 70,027 12,842 21,846
Supplemental cash flow information:      
Interest paid 10,632 11,681 12,719
Income taxes paid, net of refunds 31,289 26,449 (797)
Value of common stock received as exercise price of options 492 1,627 27,482
Transfer of auction rate securities from noncurrent assets to investments     $ 18,950