Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Income Statement [Abstract]
Net sales	$ 164,317	$ 153,943	$ 328,214	$ 308,522
Cost of sales	102,506	97,212	204,494	194,540
Gross margin	61,811	56,731	123,720	113,982
Operating expenses:
Selling, general and administrative	27,595	25,188	55,373	50,984
Other, net	8,938	1,989	11,269	4,223
Total operating expenses	36,533	27,177	66,642	55,207
Operating income	25,278	29,554	57,078	58,775
Interest expense, net	1,914	2,255	3,943	4,548
Other non-operating expense	64	149	436	267
Income before income taxes	23,300	27,150	52,699	53,960
Provision for income taxes	8,477	8,922	16,067	17,692
Net income	$ 14,823	$ 18,228	$ 36,632	$ 36,268
Net income per common share:
Basic (in dollars per share)	$ 0.62	$ 0.78	$ 1.53	$ 1.55
Diluted (in dollars per share)	$ 0.61	$ 0.77	$ 1.51	$ 1.53
Weighted average common shares:
Basic (in shares)	23,946,360	23,470,650	23,875,749	23,395,614
Diluted (in shares)	24,309,593	23,712,717	24,250,740	23,670,000