Lease Obligations and Other Commitments - Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 27, 2021	Feb. 29, 2020	Feb. 27, 2021	Feb. 29, 2020
Lease Cost [Abstract]
Consolidated operating lease expense	$ 484	$ 481	$ 1,474	$ 1,427
Consolidated financing lease amortization	23	23	69	39
Consolidated financing lease interest	2	4	9	18
Consolidated financing lease expense	25	27	78	57
Net lease cost	$ 509	$ 508	$ 1,552	$ 1,484