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Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Employee Benefit Plans (Details) - USD ($) $ in Thousands	Aug. 26, 2018	Aug. 27, 2017	Aug. 26, 2018	Aug. 27, 2017	Nov. 26, 2017
Net periodic benefit cost:
Net periodic benefit cost	$ 1,744	$ 4,138	$ 5,211	$ 12,395
Estimated future employer contributions in fiscal year 2018	124,000		124,000		$ 94,700
Pension Benefits [Member]
Net periodic benefit cost:
Net periodic benefit cost	819	2,990	2,434	8,952
Postretirement Benefits [Member]
Net periodic benefit cost:
Net periodic benefit cost	$ 925	$ 1,148	$ 2,777	$ 3,443