Interim Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 27, 2020	Mar. 29, 2019
Operating activities:
Net income including controlling interest	$ 137,265	$ 171,933
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	40,212	40,799
Stock-based compensation	43,565	40,717
Amortization of premium on investments	334	338
Provision for doubtful accounts	2,955	1,963
Deferred income taxes	(15,141)	(38,548)
Restructuring charge for exit of leased facility	602	0
Other non-cash items affecting net income	3,753	1,355
Changes in operating assets and liabilities:
Accounts receivable	(60,870)	(14,221)
Inventories	(5,376)	(7,983)
Operating lease right-of-use assets	(20,102)	0
Contract assets	(28,086)	(78,949)
Prepaid expenses and other assets	(16,068)	(15,273)
Accounts payable and other liabilities	(22,033)	(14,190)
Income taxes, net	13,238	18,414
Contract liabilities	452	1,061
Operating lease liabilities	20,099	0
Other non-current liabilities	2,100	(1,572)
Net cash provided by operating activities	96,899	105,844
Investing activities:
Purchase of investments	(167,292)	(152,499)
Proceeds from sales of investment securities	109,907	83,478
Proceeds from maturities of investment securities	54,599	78,714
Purchases of property, plant and equipment	(41,782)	(56,082)
Purchases of intangible assets	(2,640)	(17,065)
Net cash provided by/(used in) investing activities	(47,208)	(63,454)
Financing activities:
Proceeds from issuance of common stock	53,986	27,158
Repurchase of common stock	(101,672)	(197,880)
Payment of cash dividend	(44,336)	(39,035)
Distribution to controlling interest	(283)	(1,014)
Shares repurchased for tax withholdings on vesting of restricted stock	(21,094)	(20,680)
Payment related to prior purchases of intangible assets	(91)	0
Payment of deferred consideration for prior business combination	(3,000)	0
Net cash used in financing activities	(116,490)	(231,451)
Effect of foreign exchange rate changes on cash and cash equivalents	(4,350)	(1,323)
Net decrease in cash, cash equivalents, and restricted cash	(71,149)	(190,384)
Cash, cash equivalents, and restricted cash at beginning of period	805,593	925,250
Cash, cash equivalents, and restricted cash at end of period	734,444	734,866
Supplemental disclosure:
Cash paid for income taxes, net of refunds received	35,096	27,612
Non-cash investing activities:
Property, plant, and equipment purchased and unpaid at period-end	(4,914)	(5,500)
Purchase consideration payable for intangibles	$ 260	$ 0