Consolidated Statements Of Cash Flows (USD $)	3 Months Ended
	Aug. 30, 2014	Aug. 24, 2013
Cash flows from operating activities:
Net income	$ 5,395,000	$ 3,653,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	1,278,000	1,378,000
Stock-based compensation expense related to share-based awards and employee stock purchases	1,546,000	1,654,000
Excess tax benefits from stock-based compensation	(14,000)	(1,000)
Loss on disposal of assets	1,000	20,000
Deferred income taxes	(184,000)	(368,000)
Changes in operating assets and liabilities:
Trade accounts receivable	(1,890,000)	3,225,000
Prepaid expenses and other current assets	271,000	(283,000)
Income taxes	1,781,000	1,488,000
Other assets	(12,000)	90,000
Accounts payable and accrued expenses	(484,000)	(1,096,000)
Accrued salaries and related obligations	(16,573,000)	(3,892,000)
Other liabilities	216,000	(541,000)
Net cash (used in) provided by operating activities	(8,669,000)	5,327,000
Cash flows from investing activities:
Redemption of short-term investments	24,000,000	25,000,000
Purchase of short-term investments	(14,998,000)	(24,987,000)
Purchase of property and equipment	(357,000)	(1,425,000)
Net cash provided by (used in) investing activities	8,645,000	(1,412,000)
Cash flows from financing activities:
Proceeds from exercise of stock options	1,597,000	3,246,000
Proceeds from issuance of common stock under Employee Stock Purchase Plan	1,900,000	1,734,000
Purchase of common stock	(5,684,000)	(4,162,000)
Cash dividends paid	(2,686,000)	(2,391,000)
Excess tax benefits from stock-based compensation	14,000	1,000
Net cash used in financing activities	(4,859,000)	(1,572,000)
Effect of exchange rate changes on cash	(277,000)	45,000
Net (decrease) increase in cash	(5,160,000)	2,388,000
Cash and cash equivalents at beginning of period	80,291,000	94,016,000
Cash and cash equivalents at end of period	$ 75,131,000	$ 96,404,000