Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jul. 03, 2020	Sep. 27, 2019	Jun. 28, 2019
Statement of Financial Position [Abstract]
Deferred Revenue, Current	$ 7,488	$ 2,137
Current assets:
Cash and cash equivalents	131,870	75,519	$ 85,265
Short-term investments	133,248	101,226
Accounts receivable (less allowances of $3,425 and $5,047, respectively)	60,504	69,790
Inventories	95,576	107,880
Income tax receivable	18,904	16,661
Prepaid and other current assets	10,166	27,506
Total current assets	450,268	398,582
Property and equipment, net	122,000	132,647
Goodwill	314,779	314,727
Intangible assets, net	143,317	181,228
Deferred income taxes	41,648	43,812
Other investments	9,975	23,613
Other long-term assets	39,140	10,965
TOTAL ASSETS	1,121,127	1,105,574
Finance lease liabilities	1,506	1,084
Current liabilities:
Current portion of long-term debt	6,885	6,885
Accounts payable	25,599	24,822
Accrued liabilities	53,539	39,908
Total current liabilities	95,017		74,836
Finance lease liabilities	29,351	29,506
Long-term debt, less current portion	652,947	655,272
Warrant liability	27,315	12,364
Deferred income taxes	2,085	632
Other long-term liabilities	41,108	19,068
Total liabilities	847,823	791,678
Stockholders’ equity:
Common stock	67	66
Treasury stock, at cost	(330)	(330)
Accumulated other comprehensive income	4,281	4,358
Additional paid-in capital	1,126,505	1,101,576
Accumulated deficit	(857,219)	(791,774)
Total stockholders’ equity	273,304	313,896	$ 298,995
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,121,127	$ 1,105,574