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Quarterly financial data (unaudited) (Tables)
 12 Months Ended
Sep. 29, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of unaudited quarterly financial information
The following table shows a summary of the Company’s unaudited quarterly financial information for each of the four quarters of 2018 and 2017 (the sum of quarterly periods may not equal full-year amounts due to rounding):

 
Three Months Ended
 
September 29,
2018
 
June 30,
2018
 
March 31,
2018
 
December 30,
2017
(In thousands, except per share amounts)
 





 
Revenue
$
272,940

 
$
208,398

 
$
186,720

 
$
468,950

Gross profit
116,277

 
95,489

 
81,341

 
196,201

Net income (loss)
(1,720
)
 
(26,988
)
 
(32,592
)
 
45,697

Net income (loss) per share - basic
$
(0.02
)
 
$
(0.45
)
 
$
(0.55
)
 
$
0.42

Net income (loss) per share - diluted
$
(0.02
)
 
$
(0.45
)
 
$
(0.55
)
 
$
0.36

 
Three Months Ended
 
September 30,
2017
 
July 1,
2017
 
April 1,
2017
 
December 31,
2016
(In thousands, except per share amounts)
 
 
 
 
 
 
 
Revenue
$
214,095

 
$
223,078

 
$
182,546

 
$
372,807

Gross profit
102,891

 
107,288

 
86,105

 
159,782

Net income (loss)
(14,906
)
 
(14,539
)
 
(19,790
)
 
35,017

Net income (loss) per share - basic
$
(0.26
)
 
$
(0.26
)
 
$
(0.35
)
 
$
0.32

Net income (loss) per share - diluted
$
(0.26
)
 
$
(0.26
)
 
$
(0.35
)
 
$
0.26