Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Feb. 27, 2021	Feb. 29, 2020
Operating activities:
Net income (loss)	$ 6,304	$ (42,136)
Depreciation and amortization	44,391	42,911
Deferred income taxes	9,970	(13,406)
Impairment loss on property, plant & equipment	0	2,919
Other adjustments, net	(45,936)	(26,742)
Net cash provided by (used in) operations	14,729	(36,454)
Investing activities:
Purchases of investment securities	(59,415)	(12,100)
Sales and maturities of investment securities	85,202	181,533
Distributions from unconsolidated entities	5,813	6,114
Acquisition of business	0	(44,515)
Purchases of property, plant and equipment	(73,796)	(94,600)
Net proceeds from disposal of property, plant and equipment	3,273	1,839
Net cash provided by (used in) investing activities	(38,923)	38,271
Financing activities:
Purchase of common stock by treasury	(871)	(910)
Distributions to noncontrolling interests	0	(755)
Principal payments on long-term debt	0	(1,500)
Principal payments on finance lease	(153)	(146)
Contributions	5	0
Net cash used in financing activities	(1,019)	(3,311)
Net change in cash and cash equivalents	(25,213)	(1,494)
Cash and cash equivalents at beginning of period	78,130	69,247
Cash and cash equivalents at end of period	52,917	67,753
Supplemental Information:
Cash paid for operating leases	703	635
Interest paid	$ 193	$ 77