Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 03, 2020	Sep. 27, 2019
Statement of Financial Position [Abstract]
Deferred Revenue, Current	$ 7,027	$ 2,137
Current assets:
Cash and cash equivalents	120,735	75,519
Short-term investments	100,847	101,226
Accounts receivable (less allowances of $4,407 and $5,047, respectively)	53,003	69,790
Inventories	99,624	107,880
Income tax receivable	19,119	16,661
Prepaid and other current assets	24,655	27,506
Total current assets	417,983	398,582
Property and equipment, net	125,765	132,647
Goodwill	314,820	314,727
Intangible assets, net	155,735	181,228
Deferred income taxes	42,848	43,812
Other investments	14,547	23,613
Other long-term assets	41,101	10,965
TOTAL ASSETS	1,112,799	1,105,574
Finance lease liabilities	1,596	1,084
Current liabilities:
Current portion of long-term debt	6,885	6,885
Accounts payable	26,428	24,822
Accrued liabilities	51,028	39,908
Total current liabilities	92,964	74,836
Finance lease liabilities	29,697	29,506
Long-term debt, less current portion	653,722	655,272
Warrant liability	7,804	12,364
Deferred income taxes	2,051	632
Other long-term liabilities	40,830	19,068
Total liabilities	827,068	791,678
Stockholders’ equity:
Common stock	67	66
Treasury stock, at cost	(330)	(330)
Accumulated other comprehensive income	2,126	4,358
Additional paid-in capital	1,116,105	1,101,576
Accumulated deficit	(832,237)	(791,774)
Total stockholders’ equity	285,731	313,896
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,112,799	$ 1,105,574