Investment Securities (Schedule of Unrealized Holding Gain (Loss) on Investments) (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 02, 2017	Nov. 26, 2016
Gain (Loss) on Investments [Line Items]
Unrealized holding gains, net of tax on available-for-sale securities	$ (272)	$ (21)
Current investments
Gain (Loss) on Investments [Line Items]
Unrealized holding gains, net of tax on available-for-sale securities	(420)	(78)
Noncurrent investments
Gain (Loss) on Investments [Line Items]
Unrealized holding gains, net of tax on available-for-sale securities	$ 148	$ 57