Restructuring and Cost Management Plans - Amounts Related to Restructuring Costs Payable (Details) - USD ($) $ in Thousands		6 Months Ended		9 Months Ended		12 Months Ended
		Jul. 01, 2017		Dec. 30, 2017		Apr. 01, 2017
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start				$ 4,996
Restructuring Reserve End				2,608		$ 4,996
Q4 FY17 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		$ 24,804		17,218		7,587
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start				4,135		0
Restructuring Reserve End				1,718		4,135
Q4 FY17 Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		4,872		1,284		3,588
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start				3,247		0
Restructuring Reserve End				743		3,247
Q4 FY17 Restructuring Plan [Member] | Current Asset Impairments and Other Gross Profit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		$ 14,947	[1]	13,278	[2]	1,669	[2]
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start	[2]			0		0
Restructuring Reserve End	[2]			652		0
Q4 FY17 Restructuring Plan [Member] | Site Closures and Non-current Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				2,481
Chelmsford Plan [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				409		401
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start				861		757
Restructuring Reserve End				$ 890		$ 861

[1] (1) Current asset impairments include inventory charges recorded in cost of sales.

[2] (1) Asset and facilities costs include inventory charges recorded in cost of sales.