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Summary of Significant Accounting Policies (Narrative) (Details) shares in Thousands	3 Months Ended	12 Months Ended
	Mar. 25, 2017 USD ($)	Mar. 30, 2019 USD ($) customer shares	Mar. 31, 2018 USD ($) shares	Mar. 25, 2017 USD ($) shares	Apr. 01, 2019 USD ($)	Apr. 01, 2018 USD ($)
Inventory Disclosure [Abstract]
Inventory write-down		$ 6,200,000	$ 9,700,000
Property, Plant and Equipment, Net [Abstract]
Asset impairment	$ 9,800,000	0	0	$ 9,842,000
Gain on sale of assets		4,913,000	0	0
Depreciation and amortization expense on property, plant and equipment		32,000,000	27,700,000	26,100,000
Intangible Assets, Net (Including Goodwill) [Abstract]
Impairment of goodwill		0	0	0
Marketing and Advertising Expense [Abstract]
Advertising costs		$ 1,000,000	$ 1,400,000	$ 1,700,000
Earnings Per Share [Abstract]
Weighted outstanding options excluded from diluted calculation (in shares) \| shares		872	326	389
Leases, Operating [Abstract]
Reclassification from prepayments to right-of-use asset		$ (30,794,000)	$ (31,235,000)
Reclassification from accrued lease payments to right-of-use asset		(16,339,000)	(12,657,000)			$ (18,196,000)
Adjustment to opening retained earnings on transition		$ (222,430,000)	$ (139,345,000)
Hongfujin Precision \| Accounts Receivable
Concentration Of Credit Risk [Abstract]
Concentration risk, percentage		22.00%	11.00%
Jabil Circuits \| Accounts Receivable
Concentration Of Credit Risk [Abstract]
Concentration risk, percentage			18.00%
Foxconn \| Accounts Receivable
Concentration Of Credit Risk [Abstract]
Concentration risk, percentage		11.00%
Pegatron \| Accounts Receivable
Concentration Of Credit Risk [Abstract]
Concentration risk, percentage		19.00%	24.00%
Ten Largest Customers \| Customer Concentration Risk
Concentration Of Credit Risk [Abstract]
Number of customers responsible for sales concentration \| customer		10
Ten Largest Customers \| Sales Revenue, Net \| Customer Concentration Risk
Concentration Of Credit Risk [Abstract]
Concentration risk, percentage		91.00%	92.00%	92.00%
Apple, Inc. \| Sales Revenue, Net \| Customer Concentration Risk
Concentration Of Credit Risk [Abstract]
Concentration risk, percentage		78.00%	81.00%	79.00%
Capitalized Software
Property, Plant and Equipment, Net [Abstract]
Estimated useful life		3 years
Capitalized Enterprise Resource Planning Software
Property, Plant and Equipment, Net [Abstract]
Estimated useful life		10 years
Maximum
Intangible Assets, Net (Including Goodwill) [Abstract]
Intangible assets, useful life		10 years
Acquired intangible assets, useful life		15 years
Revenue, Performance Obligation [Abstract]
Warranty period		3 years
Contract Balance Payment Terms [Abstract]
Contract balance, payment term		60 days
Share-based Compensation [Abstract]
Share-based compensation, vesting period		4 years
Maximum \| Property, Plant and Equipment
Property, Plant and Equipment, Net [Abstract]
Estimated useful life		39 years
Maximum \| Furniture, Fixtures, Machinery and Equipment
Property, Plant and Equipment, Net [Abstract]
Estimated useful life		10 years
Maximum \| Buildings
Property, Plant and Equipment, Net [Abstract]
Estimated useful life		39 years
Minimum
Intangible Assets, Net (Including Goodwill) [Abstract]
Intangible assets, useful life		1 year
Acquired intangible assets, useful life		1 year
Revenue, Performance Obligation [Abstract]
Warranty period		1 year
Contract Balance Payment Terms [Abstract]
Contract balance, payment term		30 days
Share-based Compensation [Abstract]
Share-based compensation, vesting period		0 years
Minimum \| Property, Plant and Equipment
Property, Plant and Equipment, Net [Abstract]
Estimated useful life		3 years
Minimum \| Furniture, Fixtures, Machinery and Equipment
Property, Plant and Equipment, Net [Abstract]
Estimated useful life		3 years
Accounting Standards Update 2016-02 \| Subsequent Event
Leases, Operating [Abstract]
Operating lease liability					$ 158,000,000
Reclassification from prepayments to right-of-use asset					2,800,000
Reclassification from accrued lease payments to right-of-use asset					11,100,000
Operating lease right-of-use asset					149,700,000
Adjustment to opening retained earnings on transition					$ (1,000,000)