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Postretirement Benefit Plans (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 16, 2018
USD ($)
Dec. 28, 2019
USD ($)
Dec. 28, 2019
USD ($)
Mar. 28, 2020
USD ($)
Mar. 30, 2019
USD ($)
Mar. 31, 2018
USD ($)
participant
Retirement Benefits [Abstract]            
Number of pension plan participants authorized to terminate from Scheme | participant           60
Contribution paid $ 11,000          
U.K. pension settlement     $ 13,800 $ 0 $ 13,768 $ 0
Tax credit   $ 2,600        
Employee matching contribution       $ 7,500 $ 7,700 $ 6,700