Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Cash flows from operating activities:
Net income (loss)	$ (414,139)	$ 53,825	$ 247,358
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	46,705	54,925	53,342
Amortization of intangible assets	30,128	61,460	60,039
Impairment of goodwill	327,203
Goodwill and other impairment charges	121,350	0	766
Impairment of investment	2,472
Deferred income taxes	(24,471)	(14,930)	16,607
Amortization of debt issuance cost	3,321	4,647	9,565
Stock-based compensation	44,787	36,466	32,738
Non-cash restructuring charges	2,194	12,609	1,246
Amortization of right of use assets	16,033
Non-cash pension impact	2,134	(8,931)	980
Other non-cash expense (gain)	(2,571)	421	559
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	53,104	82,078	(47,020)
Inventories	28,464	17,805	(78,123)
Prepaid expenses and other assets	(2,631)	14,074	(6,695)
Other long-term assets	(2,733)	(549)	(7,692)
Accounts payable	8,187	(15,160)	(9,736)
Income taxes payable/receivable	(25,024)	(119,929)	474
Operating lease liabilities	(15,964)
Other current liabilities	(985)	(13,155)	(42,820)
Other long-term liabilities	9,343	15,745	4,523
Net cash provided by operating activities	206,907	181,401	236,111
Cash flows from investing activities:
Purchases of property and equipment	(64,919)	(83,283)	(90,757)
Proceeds from dispositions of property and equipment	21,926	5,294	4,405
Purchases of available-for-sale securities	(77,359)	(11,552)	(54,442)
Proceeds from sales and maturities of available-for-sale securities	42,168	11,552	86,786
Acquisition of businesses, net of cash acquired	0	(18,881)	(45,448)
Investment at cost	0	(3,423)	0
Proceeds from sale of discontinued operation	0	0	25,000
Proceeds from sale of other entities	0	0	6,250
Other	0	0	470
Net cash used in investing activities	(78,184)	(100,293)	(67,736)
Cash flows from financing activities:
Short-term borrowings	12,695	119,594	89,092
Repayments of short-term borrowings	(14,474)	(111,794)	(90,751)
Repayments of long-term borrowings	(7,920)	(7,537)	(171,593)
Issuance of common stock under employee stock option and purchase plans	13,362	11,811	10,574
Repurchase of common stock	0	(77,410)	(100,000)
Net settlement of restricted common stock	(13,549)	(15,179)	(36,320)
Net cash used in financing activities	(9,886)	(80,515)	(298,998)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	8,022	(5,977)	(2,419)
Net increase (decrease) in cash, cash equivalents and restricted cash	126,859	(5,384)	(133,042)
Cash, cash equivalents and restricted cash, beginning of year	318,661	324,045	457,087
Cash, cash equivalents and restricted cash, end of year	445,520	318,661	324,045
Cash paid during the year for:
Interest	13,716	14,475	16,282
Income taxes	33,617	156,650	101,924
Cash received during the year for:
Income taxes	10,933	23,416	5,203
Noncash investing and financing activities:
Unpaid property and equipment purchases	2,896	4,406	6,176
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Total cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows	318,661	$ 324,045	$ 324,045
Building
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Goodwill and other impairment charges	$ 121,350