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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Mar. 25, 2017
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Rent expense $ 12.7 $ 11.5 $ 8.2
Rental income 0.2 $ 0.3 $ 0.4
Foundry Commitments      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Non-cancelable purchase commitments 62.6    
Assembly Purchase Order Commitments      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Non-cancelable purchase commitments 1.4    
Outside Test Services Commitments      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Non-cancelable purchase commitments 10.1    
Long-term Other Purchase Obligation      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Non-cancelable purchase commitments $ 45.7