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Financial Instruments Available-for-sale investments (Tables)
 12 Months Ended
Jun. 27, 2020
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale Securities [Table Text Block]
Fair values were as follows:
 
June 27, 2020
 
June 29, 2019
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Estimated Fair Value
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Estimated Fair Value
 
(in thousands)
Available-for-sale investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Certificates of deposit
$
—

 
$
—

 
$
—

 
$
—

 
$
1,000

 
$
—

 
$
—

 
$
1,000

Corporate debt securities
35,417

 
137

 
(18
)
 
35,536

 
140,031

 
68

 
(109
)
 
139,990

Total available-for-sale investments
$
35,417

 
$
137

 
$
(18
)
 
$
35,536

 
$
141,031

 
$
68

 
$
(109
)
 
$
140,990