Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net External Sales	$ 172,916	$ 164,317	$ 348,901	$ 328,214
Gross Margin	67,819	61,918	135,558	123,934
Selling, General & Administrative Expenses	29,326	27,595	58,901	55,373
Operating Income	35,884	25,437	71,882	57,396
Intersegment Sales	15,457	12,753	31,087	2,601
Plain [Member]
Segment Reporting Information [Line Items]
Net External Sales	77,480	72,392	156,005	145,045
Gross Margin	30,867	27,802	61,483	56,252
Selling, General & Administrative Expenses	6,160	6,323	12,522	12,772
Operating Income	19,660	20,736	41,347	41,971
Intersegment Sales	1,643	1,397	3,240	2,553
Roller [Member]
Segment Reporting Information [Line Items]
Net External Sales	37,000	32,317	72,870	63,730
Gross Margin	16,270	12,930	31,227	25,718
Selling, General & Administrative Expenses	1,556	1,641	3,180	3,212
Operating Income	14,702	11,269	28,034	22,485
Intersegment Sales	3,074	2,884	7,169	6,293
Ball [Member]
Segment Reporting Information [Line Items]
Net External Sales	18,038	16,480	36,112	32,260
Gross Margin	7,408	6,740	14,687	12,915
Selling, General & Administrative Expenses	1,609	1,680	3,211	3,295
Operating Income	5,750	5,020	11,368	9,515
Intersegment Sales	762	624	1,562	1,152
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Selling, General & Administrative Expenses	14,627	12,829	29,552	25,695
Operating Income	(16,043)	(12,393)	(31,316)	(25,597)
Engineered Products [Member]
Segment Reporting Information [Line Items]
Net External Sales	40,398	43,128	83,914	87,179
Gross Margin	13,274	14,446	28,161	29,049
Selling, General & Administrative Expenses	5,076	5,122	10,436	10,399
Operating Income	11,815	805	22,449	9,022
Intersegment Sales	$ 9,978	$ 7,848	$ 19,116	$ 16,021