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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) |

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