Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 1,140,240	$ 1,161,728	$ 1,151,692
Current period foreign exchange translation	68	(3,125)	2,791
Current period marketable securities activity	(2,803)	2,823	(2,380)
Current period actuarial gain/loss activity	0	0	(14,729)
Cumulative effect of adoption of ASU 2018-02	(257)	0	0
Balance	1,229,779	1,140,240	1,161,728
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,636)	1,489
Current period foreign exchange translation	68	(3,125)
Current period marketable securities activity	0	0
Current period actuarial gain/loss activity	0	0
Cumulative effect of adoption of ASU 2018-02	0
Tax effect	0	0
Balance	(1,568)	(1,636)	1,489
Unrealized Gains (Losses) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	570	(1,661)
Current period foreign exchange translation	0	0
Current period marketable securities activity	(2,803)	2,823
Current period actuarial gain/loss activity	0	0
Cumulative effect of adoption of ASU 2018-02	0
Tax effect	589	(592)
Balance	(1,644)	570	(1,661)
Actuarial Gains (Losses) on Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	0	(11,189)
Current period foreign exchange translation	0	0
Current period marketable securities activity	0	0
Current period actuarial gain/loss activity	0	13,814
Cumulative effect of adoption of ASU 2018-02	0
Tax effect	0	(2,625)
Balance	0	0	(11,189)
Accumulated Other Comprehensive Income / (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,066)	(11,361)	(573)
Current period foreign exchange translation	68	(3,125)
Current period marketable securities activity	(2,803)	2,823
Current period actuarial gain/loss activity	0	13,814
Cumulative effect of adoption of ASU 2018-02	(257)
Tax effect	589	(3,217)
Balance	$ (3,469)	$ (1,066)	$ (11,361)