Investment Securities (Schedule of Unrealized Holding Gain (Loss) on Investments) (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 02, 2019	Mar. 03, 2018
Gain (Loss) on Securities [Line Items]
Unrealized holding gains, net of tax on available-for-sale securities	$ 732	$ (664)
Current investments
Gain (Loss) on Securities [Line Items]
Unrealized holding gains, net of tax on available-for-sale securities	689	(975)
Noncurrent investments
Gain (Loss) on Securities [Line Items]
Unrealized holding gains, net of tax on available-for-sale securities	$ 43	$ 311