Note 8 - Employee Post-employment Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2016	Jun. 02, 2015	Jun. 03, 2014
Pension Plan [Member]
Service cost		$ 312	$ 301	$ 356
Interest cost		1,999	1,773	1,737
Expected return on plan assets		(411)	(498)	(444)
Amortization of prior service cost (a)	[1]	1	1	1
Recognized actuarial loss		2,218	1,718	1,711
Curtailment expense		1
Net periodic benefit cost		4,120	3,295	3,361
Amortization of prior service cost/(credit)	[1]	(1)	(1)	(1)
Postretirement Medical and Life Benefits [Member]
Service cost		4	4	13
Interest cost		47	46	67
Amortization of prior service cost (a)	[1]			46
Recognized actuarial loss		130	134	244
Net periodic benefit cost		181	184	278
Amortization of prior service cost/(credit)	[1]			$ (46)

[1] Prior service costs are amortized on a straight-line basis over the average remaining service period of employees expected to receive benefits.