Lease Obligations and Other Commitments - Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 28, 2020	Nov. 30, 2019	Nov. 28, 2020	Nov. 30, 2019
Lease Cost [Abstract]
Consolidated operating lease expense	$ 502	$ 468	$ 990	$ 946
Consolidated financing lease amortization	23	16	46	16
Consolidated financing lease interest	3	5	7	14
Consolidated financing lease expense	26	21	53	30
Net lease cost	$ 528	$ 489	$ 1,043	$ 976