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Financial Instruments Available-for-sale investments (Tables)
 12 Months Ended
Jun. 29, 2019
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale Securities [Table Text Block]
Fair values were as follows:
 
June 29, 2019
 
June 30, 2018
 
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

 
$
52,429

 
$
—

 
$
(1
)
 
$
52,428

Commercial paper
—

 
—

 
—

 
—

 
64,354

 
—

 
—

 
64,354

Corporate debt securities
140,031

 
68

 
(109
)
 
139,990

 
369,734

 
39

 
(2,008
)
 
367,765

U.S. Treasury securities
—

 
—

 
—

 
—

 
600,068

 
10

 
(1,710
)
 
598,368

Total available-for-sale investments
$
141,031

 
$
68

 
$
(109
)
 
$
140,990

 
$
1,086,585

 
$
49

 
$
(3,719
)
 
$
1,082,915