Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Inventory Disclosure [Abstract]
Raw materials and purchased parts	$ 37,991	$ 38,747	$ 37,991	$ 38,747
Work-in-process	14,834	12,914	14,834	12,914
Finished goods	3,812	7,241	3,812	7,241
Inventories	56,637	58,902	56,637	58,902
Inventory write-off	$ 1,000	$ 12,800	$ 1,000	$ 12,800