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Fair Value Measurements - Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Mar. 31, 2018
Available For Sale Securities Current [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities $ 123,081   $ 55,118
Available-for-sale Securities, Amortized Cost Basis 123,117   55,154
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0   0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (36)   (36)
Available For Sale Securities Current [Member] | US Treasury Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities 26,910   12,958
Available-for-sale Securities, Amortized Cost Basis 26,912   12,975
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0   0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (2)   (17)
Available For Sale Securities Current [Member] | Commercial Paper [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities 58,530   29,411
Available-for-sale Securities, Amortized Cost Basis 58,530   29,411
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0   0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0   0
Available For Sale Securities Current [Member] | Corporate Bond Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Gross Unrealized Loss (34) $ (19)  
Available-for-sale Securities 37,641   12,749
Available-for-sale Securities, Amortized Cost Basis 37,675   12,768
Available-for-sale Securities, Gross Unrealized Gain 0 $ 0  
Available For Sale Securities Non Current [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities 2,190   2,048 [1]
Available-for-sale Securities, Amortized Cost Basis 2,226   1,881 [1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0   167 [1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (36)   0 [1]
Available For Sale Securities Non Current [Member] | Exchange traded funds and money market securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities 2,190   2,048 [1]
Available-for-sale Securities, Amortized Cost Basis 2,226   1,881 [1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0   167 [1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax $ (36)   $ 0 [1]
[1] *These investments represent assets held in trust for the deferred compensation plan