CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 29, 2018	Mar. 31, 2018
Statement of Financial Position [Abstract]
Trade receivables, allowances	$ 218	$ 832
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	85,654	83,159
Finite-Lived Intangible Assets, Accumulated Amortization	$ 23,480	$ 22,766
Preferred stock, without par value	$ 0	$ 0
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, without par value	$ 0	$ 0
Common stock, shares authorized	100,000,000	100,000,000
Common stock, issued	34,699,000	34,387,000
Common stock, outstanding	34,699,000	34,387,000