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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Income Statement [Abstract]
Revenue	$ 499,708	$ 570,398	$ 698,772
Cost of revenue	279,000	324,692	371,888
Gross profit	220,708	245,706	326,884
Operating expenses:
Research and development	163,469	177,713	147,986
Selling, general and administrative	153,286	161,673	187,886
Impairment charges	264,786	6,575	4,352
Restructuring charges	19,543	6,265	2,744
Total operating expenses	601,084	352,226	342,968
Loss from operations	(380,376)	(106,520)	(16,084)
Other (expense) income:
Warrant liability gain (expense)	765	27,646	(2,522)
Interest expense, net	(35,803)	(31,338)	(28,855)
Other expense	(7,739)	(45,023)	(2,044)
Total other expense, net	(42,777)	(48,715)	(33,421)
Loss before income taxes	(423,153)	(155,235)	(49,505)
Income tax (benefit) expense	(39,355)	(21,473)	100,911
Loss from continuing operations	(383,798)	(133,762)	(150,416)
Loss from discontinued operations	0	(6,215)	(19,077)
Net loss	$ (383,798)	$ (139,977)	$ (169,493)
Basic loss per share:
Loss from continuing operations (in USD per share)	$ (5.84)	$ (2.07)	$ (2.48)
Loss from discontinued operations (in USD per share)	0	(0.10)	(0.31)
Loss per share-basic (in USD per share)	(5.84)	(2.16)	(2.79)
Diluted loss per share:
Loss from continuing operations (in USD per share)	(5.84)	(2.47)	(2.48)
Loss from discontinued operations (in USD per share)	0	(0.10)	(0.31)
Loss per share-diluted (in USD per share)	$ (5.84)	$ (2.57)	$ (2.79)
Shares used:
Basic (in shares)	65,686	64,741	60,704
Diluted (in shares)	65,686	65,311	60,704

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