Consolidated Statements of Cash Flows (USD $) In Thousands	12 Months Ended
	May 28, 2011	May 29, 2010	May 30, 2009
Cash flows from operating activities:
Net income (loss)	$ 24,855	$ (11,749)	$ 17,764
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	12,253	12,040	10,281
Stock-based compensation expense related to employee stock options, restricted stock grants and employee stock purchases	9,778	15,493	17,790
Contingent consideration adjustment	(25,852)	1,492
Excess tax benefits from stock-based compensation	(491)	(657)	(524)
Bad debt expense			1,824
Loss on disposal of assets	50	168	536
Deferred income tax benefit	10,663	(1,263)	(858)
Changes in operating assets and liabilities, net of effect of acquisitions:
Trade accounts receivable	(9,919)	(593)	52,450
Prepaid expenses and other current assets	(777)	(848)	1,597
Income taxes	465	4,879	(9,291)
Other assets	436	59	92
Accounts payable and accrued expenses	1,726	(772)	(3,660)
Accrued salaries and related obligations	1,832	(11,400)	(13,814)
Other liabilities	1,045	843	(7,875)
Net cash provided by operating activities	26,064	7,692	66,312
Cash flows from investing activities:
Redemption of short-term investments	31,987	53,996	76,000
Purchase of short-term investments	(26,990)	(43,748)	(70,494)
Business acquisitions, net of cash acquired	(269)	(28,262)	(5,292)
Purchases of property and equipment	(3,852)	(3,380)	(5,898)
Net cash provided by (used in) investing activities	876	(21,394)	(5,684)
Cash flows from financing activities:
Proceeds from exercise of stock options	4,546	4,521	7,600
Proceeds from issuance of common stock under Employee Stock Purchase Plan	4,152	5,280	8,028
Purchase of common stock	(24,397)	(9,042)	(12,341)
Cash dividends paid	(5,538)
Excess tax benefits from stock-based compensation	491	657	524
Net cash (used in) provided by financing activities	(20,746)	1,416	3,811
Effect of exchange rate changes on cash	2,771	(302)	(2,006)
Net increase (decrease) in cash	8,965	(12,588)	62,433
Cash and cash equivalents at beginning of period	130,659	143,247	80,814
Cash and cash equivalents at end of period	$ 139,624	$ 130,659	$ 143,247