Summary of Significant Accounting Policies and Concentrations of Risk (Inventory) (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Mar. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 39,727	$ 14,674
Work-in-process	213,784	167,039
Finished goods	61,847	54,364
Total inventories	$ 315,358	$ 236,077

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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