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Fair Value Measurements Of Assets And Liabilities (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 29, 2017
Jun. 30, 2017
Level 1 | Money market funds    
Cash equivalents:    
Money market, net asset value (usd per share) $ 1.00 $ 1.00
Recurring | Level 1 | Cost | Money market funds    
Cash equivalents:    
Cash equivalents $ 22,423 $ 22,059
Recurring | Level 1 | Fair Value | Money market funds    
Cash equivalents:    
Cash equivalents 22,423 22,059
Recurring | Level 2 | Cost    
Cash equivalents:    
Short term investments 276 264
Other current assets 124 0
Other accrued expenses 0 5
Recurring | Level 2 | Cost | Bank certificates of deposit    
Cash equivalents:    
Cash equivalents 0 66
Recurring | Level 2 | Fair Value    
Cash equivalents:    
Short term investments 276 264
Other current assets 124 0
Other accrued expenses 0 5
Recurring | Level 2 | Fair Value | Bank certificates of deposit    
Cash equivalents:    
Cash equivalents $ 0 $ 66