Revenues (Disaggregation of Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 29, 2018	Sep. 29, 2018
Disaggregation of Revenue [Line Items]
Offering Types	$ 158,658	$ 321,152
North America Products
Disaggregation of Revenue [Line Items]
Offering Types	16,845	32,645
North America Services | Commercial Services
Disaggregation of Revenue [Line Items]
Offering Types	116,280	236,743
North America Services | Commercial Services | Installation Projects
Disaggregation of Revenue [Line Items]
Offering Types	45,936	91,831
North America Services | Commercial Services, Excluding Projects
Disaggregation of Revenue [Line Items]
Offering Types	70,344	144,912
International Products
Disaggregation of Revenue [Line Items]
Offering Types	15,991	31,743
International Services
Disaggregation of Revenue [Line Items]
Offering Types	9,542	20,021
International Services | Installation Projects
Disaggregation of Revenue [Line Items]
Offering Types	8,232	16,490
International Services | International Services, Excluding Projects
Disaggregation of Revenue [Line Items]
Offering Types	1,310	3,531
North America And International Products
Disaggregation of Revenue [Line Items]
Offering Types	32,836	64,388
North America Services And International Services
Disaggregation of Revenue [Line Items]
Offering Types	71,654	148,443
North America Services And International Services | Installation Projects
Disaggregation of Revenue [Line Items]
Offering Types	$ 54,168	$ 108,321