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Employee Benefit Plans - Accumulated benefit obligations in excess of fair value of plan assets (Details) - USD ($)
$ in Thousands
Nov. 24, 2019
Nov. 25, 2018
Accumulated benefit obligations in excess of plan assets [Abstract]    
Aggregate accumulated benefit obligation $ 1,093,503 $ 986,084
Aggregate fair value of plan assets 903,556 792,427
Projected benefit obligations in excess of plan assets [Abstract]    
Aggregate projected benefit obligation 1,142,114 1,028,074
Aggregate fair value of plan assets $ 943,810 $ 827,193