Retirement Plans -Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 91	$ 0	$ 182
Interest cost	167	170	334	340
Expected return on plan assets	(120)	(204)	(240)	(408)
Amortization and deferral	80	132	159	264
Net periodic benefit cost	127	189	253	378
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	256	223	499	446
Interest cost	444	467	876	961
Expected return on plan assets	(557)	(472)	(1,105)	(982)
Amortization and deferral	360	253	711	518
Net periodic benefit cost	$ 503	$ 471	$ 981	$ 943