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Fair Value Measurements - Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Apr. 01, 2017
Available For Sale Securities Current [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities $ 48,595 $ 10,688
Available-for-sale Securities, Amortized Cost Basis 48,596 10,688
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (1) 0
Available For Sale Securities Current [Member] | US Treasury Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 7,501  
Available-for-sale Securities, Amortized Cost Basis 7,501  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0  
Available For Sale Securities Current [Member] | Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 33,893 10,688
Available-for-sale Securities, Amortized Cost Basis 33,893 10,688
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 (1)  
Available-for-sale Securities 2,201  
Available-for-sale Securities, Amortized Cost Basis 2,202  
Available-for-sale Securities, Gross Unrealized Gain 0  
Available For Sale Securities Current [Member] | Repurchase Agreements [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross Unrealized Loss 0  
Available-for-sale Securities 5,000  
Available-for-sale Securities, Amortized Cost Basis 5,000  
Available-for-sale Securities, Gross Unrealized Gain 0  
Available For Sale Securities Non Current [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 3,473 3,058 [1]
Available-for-sale Securities, Amortized Cost Basis 3,247 2,974 [1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 226 84 [1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0 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 3,473 3,058 [1]
Available-for-sale Securities, Amortized Cost Basis 3,247 2,974 [1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 226 84 [1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax $ 0 $ 0 [1]
[1] *These investments represent assets held in trust for the deferred compensation plan