Consolidated Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Net cash provided by operating activities:
Net income	$ 81,077	$ 68,923
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	21,066	12,415
Provision for doubtful receivables	605	69
Share-based compensation	2,231	1,547
Intangible asset impairment charges		501
(Gain) loss on the sale of property and equipment	(95)	50
Realized loss on investments	697
Deferred income taxes and tax credits	5,041	(324)
Changes in operating assets and liabilities, net of effects of acquisition of businesses:
Receivables	(41,363)	(34,172)
Inventories	(34,530)	(23,404)
Prepaid expenses and other assets	(1,071)	(1,460)
Other assets and liabilities, net	128	(765)
Accounts payable	23,327	(901)
Accrued expenses and other current liabilities	(1,488)	13,214
Accrued income taxes	548	(2,094)
Net cash provided by operating activities	56,173	33,599
Net cash provided (used) by investing activities:
Capital and other intangible expenditures	(11,238)	(3,032)
Proceeds from the sale of property and equipment	1,534	63
Proceeds from sale of investments	22,421	300
Payments to acquire businesses		(69,000)
Net cash provided (used) by investing activities	12,717	(71,669)
Net cash used by financing activities:
Proceeds from line of credit	809,450
Repayment of line of credit	(810,450)
Repayment of long-term debt	(53,000)	(3,000)
Payments of financing costs	(25)
Proceeds from exercise of stock options and employee stock purchases, including tax benefits	5,907	3,284
Payments for repurchases of common stock		(1,799)
Payment of tax obligations resulting from cashless option exercise	(12,546)
Net cash used by financing activities	(60,664)	(1,515)
Net increase (decrease) in cash and cash equivalents	8,226	(39,585)
Cash and cash equivalents, beginning balance	27,193	110,208
Cash and cash equivalents, ending balance	35,419	70,623
Supplemental cash flow information:
Interest paid	8,745	6,208
Income taxes paid, net of refunds	1,779	9,389
Value of common stock received as exercise price of options	25,822
Transfer of auction rate securities from non-current assets to investments	$ 18,950