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Summary of Significant Accounting Policies (Narrative) (Details) shares in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 25, 2017 USD ($) | Mar. 31, 2018 USD ($) customer shares | Mar. 25, 2017 USD ($) shares | Mar. 26, 2016 USD ($) shares
Inventory write-down |  | $ 9,700,000 | $ 6,700,000 |
Asset impairment | $ 9,800,000 | 0 | 9,842,000 | $ 0
Depreciation and amortization expense on property, plant and equipment |  | 27,700,000 | 26,100,000 | 22,300,000
Impairment of goodwill |  | 0 | 0 | 0
Advertising costs |  | $ 1,400,000 | $ 1,700,000 | $ 1,600,000
Weighted outstanding options excluded from diluted calculation (in shares) | shares |  | 326 | 389 | 468
Pegatron | Accounts Receivable |  |  |  |
Concentration risk, percentage |  | 24.00% |  |
Jabil Circuits | Accounts Receivable |  |  |  |
Concentration risk, percentage |  | 18.00% | 13.00% |
Hongfujin Precision | Accounts Receivable |  |  |  |
Concentration risk, percentage |  | 11.00% | 20.00% |
Protek | Accounts Receivable |  |  |  |
Concentration risk, percentage |  |  | 15.00% |
Customer Concentration Risk | Ten Largest Customers |  |  |  |
Number of customers responsible for sales concentration | customer |  | 10 |  |
Customer Concentration Risk | Ten Largest Customers | Sales Revenue, Net |  |  |  |
Concentration risk, percentage |  | 92.00% | 92.00% | 89.00%
Customer Concentration Risk | Apple, Inc. | Sales Revenue, Net |  |  |  |
Concentration risk, percentage |  | 81.00% | 79.00% | 66.00%
Customer Concentration Risk | Samsung Electronics | Sales Revenue, Net |  |  |  |
Concentration risk, percentage |  |  |  | 15.00%
Maximum |  |  |  |
Intangible assets, useful life |  | 10 years |  |
Acquired intangible assets, useful life |  | 15 years |  |
Share-based compensation, vesting period |  | 4 years |  |
Minimum |  |  |  |
Intangible assets, useful life |  | 1 year |  |
Acquired intangible assets, useful life |  | 1 year |  |
Share-based compensation, vesting period |  | 0 years |  |
Property, Plant and Equipment | Maximum |  |  |  |
Estimated useful life |  | 39 years |  |
Property, Plant and Equipment | Minimum |  |  |  |
Estimated useful life |  | 3 years |  |
Furniture, Fixtures, Machinery and Equipment | Maximum |  |  |  |
Estimated useful life |  | 10 years |  |
Furniture, Fixtures, Machinery and Equipment | Minimum |  |  |  |
Estimated useful life |  | 3 years |  |
Buildings | Maximum |  |  |  |
Estimated useful life |  | 39 years |  |
Capitalized Software |  |  |  |
Estimated useful life |  | 3 years |  |
Capitalized Enterprise Resource Planning Software |  |  |  |
Estimated useful life |  | 10 years |  |
Accounting Standards Update 2016-16 |  |  |  |
Cumulative effect of adoption of new ASU | 747,000 |  | $ 747,000 |
Retained Earnings [Member] | Accounting Standards Update 2016-16 |  |  |  |
Cumulative effect of adoption of new ASU | $ 747,000 |  | $ 747,000 |

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