Interim Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 26, 2020	Jun. 28, 2019
Operating activities:
Net income including controlling interest	$ 204,643	$ 211,570
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	63,899	62,814
Stock-based compensation	64,850	59,580
Amortization of premium on investments	545	319
Provision for doubtful accounts	5,927	5,201
Deferred income taxes	9,834	(34,872)
Restructuring charge for exit of leased facility	1,441	27,463
Other non-cash items affecting net income	5,348	2,100
Changes in operating assets and liabilities:
Accounts receivable, net	(64,247)	(70,022)
Contract assets	67,334	(16,942)
Inventories	(12,533)	(15,976)
Operating lease right-of-use assets	(16,969)	0
Prepaid expenses and other assets	(10,812)	(13,719)
Accounts payable and other liabilities	(48,292)	(10,733)
Income taxes, net	(58,243)	(5,226)
Contract liabilities	(2,222)	491
Operating lease liabilities	17,632	0
Other non-current liabilities	3,052	(4,854)
Net cash provided by operating activities	231,187	197,194
Investing activities:
Purchase of investments	(266,065)	(220,321)
Proceeds from sales of investment securities	206,728	149,023
Proceeds from maturities of investment securities	97,625	109,821
Purchases of property, plant and equipment	(55,909)	(79,670)
Payments for business acquisitions, net of cash acquired	0	(14,919)
Purchases of intangible assets	(2,640)	(17,255)
Net cash provided by/(used in) investing activities	(20,261)	(73,321)
Financing activities:
Proceeds from issuance of common stock	68,289	45,027
Repurchase of common stock	(128,753)	(286,512)
Payment of cash dividend	(66,439)	(58,318)
Distribution to controlling interest	(283)	(1,015)
Shares repurchased for tax withholdings on vesting of restricted stock	(21,969)	(21,761)
Payment related to prior purchases of intangible assets	(91)	0
Payment of deferred consideration for prior business combination	(4,671)	0
Net cash used in financing activities	(153,917)	(322,579)
Effect of foreign exchange rate changes on cash and cash equivalents	791	(2,499)
Net increase/(decrease) in cash, cash equivalents, and restricted cash	57,800	(201,205)
Cash, cash equivalents, and restricted cash at beginning of period	805,593	925,250
Cash, cash equivalents, and restricted cash at end of period	863,393	724,045
Supplemental disclosure:
Cash paid for income taxes, net of refunds received	49,784	43,549
Non-cash investing activities:
Property, plant, and equipment purchased and unpaid at period-end	(9,699)	(10,785)
Purchase consideration payable for acquisition	0	1,700
Purchase consideration payable for intangibles	$ 260	$ 1,881