Credit Facility (Narrative) (Details) - Credit Agreement [Member]	9 Months Ended
	Feb. 26, 2022 USD ($)
Line Of Credit Facility [Line Items]
Credit facility term	5 years
Maximum borrowing capacity	$ 250,000,000
Available additional capacity	200,000,000
Amount outstanding	$ 0
Maximum total funded debt to capitalization ratio	50.00%
Minimum tangible net worth, amount	$ 700,000
Minimum tangible net worth, percentage of net income	50.00%
Threshold of voting control in related entities that requires compliance with covenant	100.00%
Minimum amount of company voting stock	50.00%
Dividend policy, percentage	33.33%
Minimum cash, cash equivalents, and credit facility availability	$ 50,000,000
Minimum [Member]
Line Of Credit Facility [Line Items]
Commitment fee	0.15%
Maximum [Member]
Line Of Credit Facility [Line Items]
Commitment fee	0.25%
Eurodollar [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Eurodollar [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
Eurodollar, One Month [Member]
Line Of Credit Facility [Line Items]
Interest period	12 months
Eurodollar, Two Month [Member]
Line Of Credit Facility [Line Items]
Interest period	6 months
Eurodollar, Three Month [Member]
Line Of Credit Facility [Line Items]
Interest period	3 months
Eurodollar, Six Month [Member]
Line Of Credit Facility [Line Items]
Interest period	2 months
Eurodollar, Twelve Month [Member]
Line Of Credit Facility [Line Items]
Interest period	1 month
Base Rate [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
Base Rate [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate	0.75%
Base Rate, Federal Funds [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Base Rate, Eurodollar [Member]
Line Of Credit Facility [Line Items]
Interest period	1 month
Basis spread on variable rate	1.00%
Standby Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 15,000,000
Amount outstanding	4,100,000
Swingline [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 15,000,000