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Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 112,248	$ 108,306	$ 128,465	$ 150,689	$ 151,187	$ 137,872	$ 150,414	$ 130,925	$ 499,708	$ 570,398	$ 698,772
Gross profit	52,925	33,828	57,330	76,625	70,982	48,169	65,601	60,954	220,708	245,706	326,884
Loss from continuing operations	$ 10,516	$ (324,714)	$ (46,204)	$ (23,396)	(16,116)	(85,210)	(15,466)	(16,970)	(383,798)	(133,762)	(150,416)
Loss from discontinued operations					$ (378)	$ (220)	$ (18)	$ (5,599)	$ 0	$ (6,215)	$ (19,077)
Per share data
Loss from continuing operations (in USD per share)	$ 0.16	$ (4.93)	$ (0.71)	$ (0.36)	$ (0.25)	$ (1.31)	$ (0.24)	$ (0.26)	$ (5.84)	$ (2.07)	$ (2.48)
Loss from discontinued operations (in USD per share)					(0.01)	0.00	0.00	(0.09)	0	(0.10)	(0.31)
Per share data
Loss from continuing operations (in USD per share)	$ 0.16	$ (4.95)	$ (0.71)	$ (0.44)	(0.29)	(1.31)	(0.50)	(0.49)	(5.84)	(2.47)	(2.48)
Loss from discontinued operations (in USD per share)					$ (0.01)	$ 0.00	$ 0.00	$ (0.09)	$ 0	$ (0.10)	$ (0.31)
Warrant liability gain		$ 1,900		$ 5,500	$ 2,800		$ 17,000	$ 14,600

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