Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Jun. 24, 2017	Jun. 25, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 42,912	$ 18,071
Other comprehensive income (loss), before tax
Foreign currency translation	290	188
Unrealized gain on marketable securities	34	67
Actuarial gain on pension plan	792	0
Reclassification of actuarial gain to net income	0	(27)
Provision for income taxes	(150)	(1)
Comprehensive income	$ 43,878	$ 18,298