Investment Securities (Schedule of Unrealized Holding Gain (Loss) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 02, 2017	Aug. 27, 2016
Gain (Loss) on Investments [Line Items]
Unrealized holding gains, net of tax on available-for-sale securities	$ 32	$ 311
Current investments
Gain (Loss) on Investments [Line Items]
Unrealized holding gains, net of tax on available-for-sale securities	8	271
Noncurrent investments
Gain (Loss) on Investments [Line Items]
Unrealized holding gains, net of tax on available-for-sale securities	$ 24	$ 40