Interim Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018
Operating activities:
Net income including controlling interest	$ 211,570	$ 15,451
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62,814	61,398
Stock-based compensation	59,580	53,476
Amortization of premium on investments	319	2,046
Provision for doubtful accounts	5,201	2,465
Deferred income taxes	(34,872)	15,163
Restructuring charge for exit of leased building	27,463	0
Other non-cash items affecting net income	2,100	5,147
Changes in operating assets and liabilities:
Accounts receivable	(70,022)	1,975
Inventories	(15,976)	(508)
Contract assets	(16,942)	12,897
Prepaid expenses and other assets	(13,719)	(13,718)
Accounts payable and other liabilities	(10,733)	(16,368)
Income taxes, net	(5,226)	102,422
Contract liabilities	491	(838)
Other non-current liabilities	(4,854)	(537)
Net cash provided by operating activities	197,194	240,471
Investing activities:
Purchase of investments	(220,321)	(151,585)
Proceeds from sales of investment securities	149,023	72,090
Proceeds from maturities of investment securities	109,821	194,038
Purchases of property, plant and equipment	(79,670)	(54,869)
Payments for business acquisitions, net of cash acquired	(14,919)	(6,563)
Purchases of intangible assets	(17,255)	(12,543)
Net cash provided by/(used in) investing activities	(73,321)	40,568
Financing activities:
Proceeds from issuance of common stock	45,027	85,941
Repurchase of common stock	(286,512)	(90,480)
Payment of cash dividend	(58,318)	(49,596)
Distribution to controlling interest	(1,015)	(1,022)
Shares repurchased for tax withholdings on vesting of restricted stock	(21,761)	(21,189)
Net cash used in financing activities	(322,579)	(76,346)
Effect of foreign exchange rate changes on cash and cash equivalents	(2,499)	(1,598)
Net increase/(decrease) in cash and cash equivalents	(201,205)	203,095
Cash, cash equivalents, and restricted cash at beginning of period	925,250	634,368
Cash, cash equivalents, and restricted cash at end of period	724,045	837,463
Supplemental disclosure:
Cash paid for income taxes, net of refunds received	43,549	48,931
Non-cash investing activities:
Net change in PP&E purchased and unpaid at period-end	(10,785)	4,820
Purchase consideration payable for acquisition	1,700	750
Purchase consideration payable for intangibles	$ 1,881	$ 200