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Contingencies (Details)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 26, 2018
USD ($)
LegalMatter
Sep. 27, 2017
USD ($)
Sep. 26, 2018
USD ($)
LegalMatter
Loss Contingencies [Line Items]      
Payments for Legal Settlements $ 0.5    
Letters of Credit Outstanding, Amount $ 29.0   $ 29.0
Loss Contingency, Pending Claims, Number | LegalMatter 0   0
Loss Contingency Insurance Coverage Deductible $ 2.0    
Cyber security incident charges $ 0.4 $ 0.0 $ 2.4
Lease Guarantees And Secondary Obligations [Member]      
Loss Contingencies [Line Items]      
Description of Material Contingencies of Registrant No other liabilities related to this matter have been recorded    
Loss Contingency, Estimate of Possible Loss $ 5.0   $ 5.0