Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Cash provided (used) by operating activities:
Net income	$ 115,666	$ 110,374	$ 93,305
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	35,328	30,178	18,502
Provision for doubtful receivables	188	548	865
Non-cash share-based compensation	5,913	2,928	2,017
Intangible asset impairment charges			2,161
(Gain) loss on the sale of property and equipment	175	(537)	22
Realized and unrealized loss on investments		697
Write off of deferred finance costs due to early extinguishment of debt			92
Deferred income taxes and tax credits	(12,061)	5,070	2,219
Changes in operating capital, net of effects of acquisition of businesses:
Receivables	(24,624)	(7,368)	(166)
Inventories	(34,625)	(28,912)	(26,049)
Prepaid expenses and other current assets	(1,545)	(1,927)	(75)
Other assets and liabilities, net	(326)	189	(917)
Accounts payable	2,507	(3,476)	(8,130)
Accrued expenses and other current liabilities	1,360	(4,874)	8,479
Accrued income taxes	(398)	990	(4,895)
Net cash provided by operating activities	87,558	103,880	87,430
Cash provided (used) by investing activities:
Capital and intangible asset expenditures	(14,688)	(16,051)	(4,629)
Proceeds from the sale of property and equipment	26	2,339	78
Note receivable from land sale	737	(733)
Proceeds from sale of investments		22,421	350
Payments to acquire businesses, net of cash received		(160,000)	(336,240)
Net cash used by investing activities	(13,925)	(152,024)	(340,441)
Cash provided (used) by financing activities:
Proceeds from line of credit	234,650	1,369,850	94,000
Repayment of line of credit	(323,750)	(1,269,750)	(23,000)
Proceeds from issuance of long-term debt			100,000
Repayments of long-term debt	(3,000)	(53,000)	(3,000)
Payments of financing costs	(28)	(499)	(3,898)
Proceeds from exercise of stock options and employee stock purchases, including tax benefits	10,392	8,688	7,594
Payment of tax obligations resulting from cashless option exercises		(12,591)
Payments for repurchases of common stock	(1,759)		(1,799)
Share-based compensation tax benefit	858	99	99
Net cash provided (used) by financing activities	(82,637)	42,797	169,996
Net decrease in cash and cash equivalents	(9,004)	(5,347)	(83,015)
Cash and cash equivalents, beginning balance	21,846	27,193	110,208
Cash and cash equivalents, ending balance	12,842	21,846	27,193
Supplemental cash flow information:
Interest paid	11,681	12,719	8,632
Income taxes paid, net of refunds	26,449	(797)	11,226
Value of common stock received as exercise price of options	1,627	27,482	226
Transfer of auction rate securities from non-current assets to investments		$ 18,950