Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jul. 04, 2020	Jun. 29, 2019
Cash flows from operating activities:
Net income (loss)	$ (421,828)	$ 53,201
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	36,257	41,462
Amortization of intangible assets	27,166	47,725
Impairment of goodwill	327,203	0
Impairment of long-lived assets	121,350	0
Impairment of investment	2,472	0
Deferred income taxes	(21,797)	(8,209)
Amortization of debt issuance cost	2,451	3,810
Stock-based compensation	31,076	26,535
Non-cash restructuring charges	2,068	12,121
Amortization of operating right of use assets	12,146	0
Other non-cash expense (income)	1,647	(2,498)
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	71,723	85,090
Inventories	(164)	1,719
Prepaid expenses and other assets	(626)	8,327
Other long-term assets	1,391	1,661
Accounts payable	14,716	(5,218)
Income taxes payable/receivable	(33,642)	(115,413)
Operating lease liabilities	(12,342)	0
Other current liabilities	(5,194)	(16,737)
Other long-term liabilities	3,991	1,788
Net cash provided by operating activities	160,064	135,364
Cash flows from investing activities:
Purchases of property and equipment	(48,436)	(60,511)
Proceeds from dispositions of property and equipment	668	5,228
Purchases of available-for-sale securities	(42,018)	(11,552)
Proceeds from sales and maturities of available-for-sale securities	240	9,557
Acquisition of businesses, net of cash acquired	0	(18,881)
Investment at cost	0	(3,423)
Net cash used in investing activities	(89,546)	(79,582)
Cash flows from financing activities:
Short-term borrowings	12,695	107,054
Repayments of short-term borrowings	(14,010)	(68,720)
Repayments of long-term borrowings	(5,865)	(5,686)
Issuance of common stock under employee stock option and purchase plans	13,361	11,811
Net settlement of restricted common stock	(13,519)	(15,167)
Repurchase of common stock	0	(77,410)
Net cash used in financing activities	(7,338)	(48,118)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,373	(1,940)
Net increase in cash, cash equivalents and restricted cash	65,553	5,724
Cash, cash equivalents and restricted cash, beginning of period	318,661	324,045
Cash, cash equivalents and restricted cash, end of period	384,214	329,769
Non-cash investing and financing activities:
Unpaid property and equipment purchases	$ 5,826	$ 4,985