CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss)
Balance at beginning of year at Mar. 28, 2015	$ 177,321	$ 189,134	$ (11,741)	$ (72)
Balance at beginning of year (shares) at Mar. 28, 2015		30,704
Stock plans:
Employee stock plans (shares)		909
Employee stock plans	5,827	$ 5,827
Stock Repurchased During Period, Value	0
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	(63)
Comprehensive income (loss):
Net (loss) income	(12,257)		(12,257)
Other Comprehensive Income (Loss), Net of Tax	(923)			(923)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	3
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(922)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	(4)
Comprehensive (loss) income	(13,180)
Balance at end of year at Apr. 02, 2016	170,031	$ 195,024	(23,998)	(995)
Balance at end of year (shares) at Apr. 02, 2016		31,613
Stock plans:
Employee stock plans (shares)		1,647
Employee stock plans	7,652	$ 7,652
Stock Repurchased During Period, Value	0
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	(4,476)
Comprehensive income (loss):
Net (loss) income	(37,409)
Other Comprehensive Income (Loss), Net of Tax	(219)			(219)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(6)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(348)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	135
Comprehensive (loss) income	(37,628)			(219)
Balance at end of year at Apr. 01, 2017	144,531	$ 207,152	(61,407)	(1,214)
Balance at end of year (shares) at Apr. 01, 2017		33,260
Stock plans:
Employee stock plans (shares)		1,127
Employee stock plans	4,104	$ 4,104
Stock Repurchased During Period, Value	0
Business Combination, Step Acquisition, Equity Interest Clawback	(261)
Comprehensive income (loss):
Net (loss) income	116,223
Other Comprehensive Income (Loss), Net of Tax	1,761			1,761
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(10)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	1,832
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	(61)
Comprehensive (loss) income	117,984			1,761
Balance at end of year at Mar. 31, 2018	$ 266,358	$ 210,995	$ 54,816	$ 547
Balance at end of year (shares) at Mar. 31, 2018		34,387