Investment Securities (Narrative) (Details) - USD ($)	9 Months Ended
Mar. 02, 2019	Mar. 03, 2018
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of available-for-sale securities	$ 160,200,000	$ 95,300,000
Gross realized gains on sales of available-for-sale securities	55,000	25,000
Gross realized losses on sales of available-for-sale securities	$ 35,000	$ 5,000

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration