Other Assets Other assets other details (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Demo equipment depreciation expense	$ 0.6	$ 0.1	$ 0.8	$ 0.3