Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Revenue from contracts with customers	$ 172,916	$ 164,317	$ 348,901	$ 328,214
Plain [Member]
Revenue from contracts with customers	77,480	72,392	156,005	145,045
Roller [Member]
Revenue from contracts with customers	37,000	32,317	72,870	63,730
Ball [Member]
Revenue from contracts with customers	18,038	16,480	36,112	32,260
Engineered Products [Member]
Revenue from contracts with customers	40,398	43,128	83,914	87,179
Aerospace [Member]
Revenue from contracts with customers	106,510	101,989	211,001	205,451
Aerospace [Member] | Plain [Member]
Revenue from contracts with customers	57,821	54,890	114,205	109,361
Aerospace [Member] | Roller [Member]
Revenue from contracts with customers	18,155	15,151	35,042	31,090
Aerospace [Member] | Ball [Member]
Revenue from contracts with customers	5,017	3,757	9,021	7,402
Aerospace [Member] | Engineered Products [Member]
Revenue from contracts with customers	25,517	28,191	52,733	57,598
Industrial [Member]
Revenue from contracts with customers	66,406	62,328	137,900	122,763
Industrial [Member] | Plain [Member]
Revenue from contracts with customers	19,659	17,502	41,800	35,683
Industrial [Member] | Roller [Member]
Revenue from contracts with customers	18,845	17,166	37,828	32,640
Industrial [Member] | Ball [Member]
Revenue from contracts with customers	13,021	12,723	27,091	24,859
Industrial [Member] | Engineered Products [Member]
Revenue from contracts with customers	$ 14,881	$ 14,937	$ 31,181	$ 29,581