Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Aug. 30, 2020	May 31, 2020
Level 1
Assets:
Assets held for sale - nonrecurring	$ 8,027	$ 0
Investment in non-public company	0	0
Total assets	8,027	0
Liabilities:
Interest rate swap contracts	0	0
Total liabilities	0	0
Level 2
Assets:
Assets held for sale - nonrecurring	0	0
Investment in non-public company	0	0
Total assets	0	0
Liabilities:
Interest rate swap contracts	3,154	3,578
Total liabilities	3,154	3,578
Level 3
Assets:
Assets held for sale - nonrecurring	0	2,607
Investment in non-public company	56,900	56,900
Total assets	56,900	59,507
Liabilities:
Interest rate swap contracts	0	0
Total liabilities	$ 0	$ 0