Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (46,078)	$ (383,798)	$ (139,977)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and intangible amortization	78,826	104,418	112,383
Share-based compensation	35,674	23,792	31,937
Warrant liability expense (gain)	12,948	(765)	(27,646)
Deferred financing costs amortization	4,061	4,061	4,587
Loss from disposition of business	0	0	34,343
Deferred income taxes	3,340	(41,297)	(16,528)
Impairment and restructuring related charges	0	273,572	9,143
Loss on and impairment of minority equity investments	5,867	7,481	10,406
Changes in assets held for sale from discontinued operations	0	0	(6,644)
Other adjustments, net	1,241	194	1,687
Change in operating assets and liabilities:
Accounts receivable	23,906	27,585	38,679
Inventories	16,296	14,964	(2,166)
Prepaid expenses and other assets	18,077	3,419	(10,585)
Accounts payable	(1,603)	(12,220)	(2,609)
Accrued and other liabilities	3,915	(2,486)	2,347
Income taxes	14,927	1,780	(3,064)
Net cash from operating activities	171,397	20,700	36,293
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(17,573)	(37,963)	(53,044)
Proceeds from sale of assets	419	5,541	1,274
Proceeds from sales and maturities of short-term investments	183,874	173,020	100,375
Purchases of short-term investments	(284,918)	(174,114)	(114,461)
Proceeds associated with divested business and discontinued operations	11,003	0	4,737
Purchases of other investments	0	0	(5,000)
Acquisition of businesses, net	0	(375)	(1,000)
Net cash used in investing activities	(107,195)	(33,891)	(67,119)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from stock option exercises and employee stock purchases	4,585	7,193	6,957
Repayments of long-term debt	(6,885)	(6,885)	(6,885)
Payments for finance leases and other	(1,708)	(1,421)	(713)
Repurchase of common stock for tax withholdings on equity awards	(6,708)	(4,137)	(6,828)
Proceeds from corporate facility financing obligation	0	0	4,000
Payments for financing costs	0	0	(505)
Other adjustments, net	0	(578)	(477)
Net cash used in financing activities	(10,716)	(5,828)	(4,451)
Foreign currency effect on cash	436	(138)	(151)
NET CHANGE IN CASH AND CASH EQUIVALENTS	53,922	(19,157)	(35,428)
CASH AND CASH EQUIVALENTS — Beginning of year	75,519	94,676	130,104
CASH AND CASH EQUIVALENTS — End of year	$ 129,441	$ 75,519	$ 94,676