CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statement - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Mar. 31, 2018	Apr. 01, 2017	Apr. 02, 2016
Net (loss) income	$ 75,088	$ 33,973	$ 4,260	$ 2,902	$ (17,923)	$ (9,693)	$ (9,675)	$ (118)	$ 116,223	$ (37,409)	$ (12,257)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax									1,832	(348)	(922)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax									(61)	135	(4)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax									(10)	(6)	3
Other Comprehensive Income (Loss), Net of Tax									1,761	(219)	(923)
Comprehensive (loss) income									$ 117,984	$ (37,628)	$ (13,180)