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Discontinued Operations (Tables)
 12 Months Ended
Sep. 27, 2019
Discontinued Operations and Disposal Groups [Abstract]  
Summary of Operating Results Related to Divested Businesses
The accompanying Consolidated Statements of Operations includes the following operating results related to these discontinued operations (in thousands):
 
Fiscal Years
 
2018
 
2017
Revenue (1)
$
—

 
$
660

Cost of revenue (1)
(596
)
 
2,252

Gross profit (loss)
596

 
(1,592
)
Operating expenses:
 
 
 
Research and development (1)
5,251

 
29,167

Selling, general and administrative (1)
1,560

 
13,840

Total operating expenses
6,811

 
43,007

Loss from discontinued operations (1)
(6,215
)
 
(44,599
)
Other income (2)
—

 
7,500

Gain on sale (2)
—

 
18,022

Loss income before income taxes
(6,215
)
 
(19,077
)
Income tax provision (benefit)
—

 
—

Loss income from discontinued operations
(6,215
)
 
(19,077
)
 
 
 
 
Cash flow used in Operating Activities (1)
(10,734
)
 
(42,776
)
Cash flow from Investing Activities (2)
—

 
25,522