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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Summary of Significant Accounting Policies (Narrative) (Details) shares in Thousands	3 Months Ended		12 Months Ended
	Mar. 28, 2020 USD ($)	Jun. 29, 2019 USD ($)	Mar. 28, 2020 USD ($) customer shares	Mar. 30, 2019 USD ($) shares	Mar. 31, 2018 USD ($) shares	Mar. 31, 2019 USD ($)
Inventory Disclosure [Abstract]
Inventory write-down			$ 2,800,000	$ 6,200,000
Property, Plant and Equipment, Net [Abstract]
Gain on sale of assets			0	4,913,000	$ 0
Equipment disposal charges, net of recovery			9,578,000
Depreciation and amortization expense on property, plant and equipment			31,900,000	32,000,000.0	27,700,000
Intangible Assets, Net (Including Goodwill) [Abstract]
Impairment of goodwill			0	0	0
Impairment and write-off of intangible assets	$ 10,000,000.0		9,961,000	0	0
Marketing and Advertising Expense [Abstract]
Advertising costs			$ 900,000	$ 1,000,000.0	$ 1,400,000
Earnings Per Share [Abstract]
Weighted outstanding options excluded from diluted calculation (in shares) \| shares			543	872	326
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Cumulative effect of adoption of ASU 2018-02			$ (257,000)	$ 0	$ 0
Accumulated Deficit
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Cumulative effect of adoption of ASU 2018-02			257,000
Accumulated Other Comprehensive Income / (Loss)
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Cumulative effect of adoption of ASU 2018-02			$ (257,000)
Hongfujin Precision \| Accounts Receivable
Concentration Of Credit Risk [Abstract]
Concentration risk, percentage			29.00%	22.00%
Pegatron \| Accounts Receivable
Concentration Of Credit Risk [Abstract]
Concentration risk, percentage			20.00%	19.00%
Foxconn \| Accounts Receivable
Concentration Of Credit Risk [Abstract]
Concentration risk, percentage				11.00%
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			93.00%	91.00%	92.00%
Apple, Inc. \| Sales Revenue, Net \| Customer Concentration Risk
Concentration Of Credit Risk [Abstract]
Concentration risk, percentage			79.00%	78.00%	81.00%
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
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
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
Accounting Standards Update 2016-02
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Cumulative effect of adoption of new ASU				$ (726,000)		$ (700,000)
Accounting Standards Update 2016-02 \| Accumulated Deficit
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Cumulative effect of adoption of new ASU				$ (726,000)
Accounting Standards Update 2018-02 \| Accumulated Deficit
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Cumulative effect of adoption of ASU 2018-02		$ 300,000
Accounting Standards Update 2018-02 \| Accumulated Other Comprehensive Income / (Loss)
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Cumulative effect of adoption of ASU 2018-02		$ (300,000)