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. 29, 2018		Apr. 01, 2017
Q4 FY17 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		$ 24,660		$ 0		$ 17,074
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start				139
Restructuring Reserve End				81		4,135
Q4 FY17 Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		4,925		0		1,337
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start				139
Restructuring Reserve End				81		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]	0	[2]	13,278	[2]
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start	[2]			0
Restructuring Reserve End	[2]			0		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				2,300
Chelmsford Plan [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				$ 0		$ 400

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

[2] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjk2NDhhYThkMTgyNDQ5MjRiMzY4NzdiODcxOTIyOGFlfFRleHRTZWxlY3Rpb246RDU3M0NGMkQ1RkY5RDFBOUY4OTAzMkNDNzkyNUMxMTYM}