Note 10 - Pension and Postretirement Benefits - Amounts in Accumulated Other Comprehensive Income That Have Not Been Recognized as Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	Nov. 28, 2020	Nov. 30, 2019
Pension Plan [Member] | UNITED STATES
Unrecognized actuarial loss	$ 147,917	$ 146,149
Unrecognized prior service (benefit) cost	(6)	(9)
Ending balance	147,911	146,140
Pension Plan [Member] | Foreign Plan [Member]
Unrecognized actuarial loss	87,368	83,457
Unrecognized prior service (benefit) cost	1,453	1,476
Ending balance	88,821	84,933
Other Postretirement Benefits Plan [Member]
Unrecognized actuarial loss	(4,318)	2,114
Unrecognized prior service (benefit) cost	0	0
Ending balance	$ (4,318)	$ 2,114