Lease Obligations and Other Commitments - Schedule of Cash Outflows of Leasing Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 27, 2021	Feb. 29, 2020	Feb. 27, 2021	Feb. 29, 2020
Commitments And Contingencies Disclosure [Abstract]
Operating cash flows from operating leases			$ 430
Operating cash flows from financing leases			127
Finance cash flows from financing leases	$ 45	$ 46	$ 136	$ 121