Interim Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 25, 2020
Operating activities:
Net income including controlling interest	$ 80,010	$ 142,690
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,477	22,168
Stock-based compensation	32,656	26,313
Amortization of operating lease right-of-use assets	3,944	4,194
Amortization of premium on investments	311	329
Provision for doubtful accounts	1,559	(1,367)
Deferred income taxes	(9,004)	(15,439)
Gain on sale of assets	0	(13,871)
Other non-cash items affecting net income	(358)	1,276
Changes in operating assets and liabilities:
Accounts receivable, net	(9,965)	(111,902)
Contract assets	(44,428)	(26,384)
Inventories	(1,819)	4,424
Operating lease right-of-use assets	(77)	(844)
Prepaid expenses and other assets	(7,082)	6,397
Accounts payable and other liabilities	(34,034)	30,397
Income taxes, net	1,439	13,984
Contract liabilities	3,350	5,153
Operating lease liabilities	(4,038)	(3,481)
Other non-current liabilities	(4,281)	(1,877)
Net cash provided by operating activities	31,660	82,160
Investing activities:
Purchase of investments	(108,147)	(13,726)
Proceeds from sales of investment securities	2,001	1,854
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	10,913	9,535
Purchases of property, plant and equipment	(14,452)	(15,527)
Proceeds from sale of assets	0	16,365
Purchases of intangible assets	(11,426)	0
Purchases of other investments	(5,000)	0
Net cash provided by/(used in) investing activities	(126,111)	(1,499)
Financing activities:
Proceeds from issuance of common stock	21,372	51,323
Repurchase of common stock	(35,573)	(39,985)
Payment of cash dividend	(25,283)	(22,231)
Distribution to controlling interest	(1,435)	(7,362)
Shares repurchased for tax withholdings on vesting of restricted stock	(31,920)	(28,085)
Net cash used in financing activities	(72,839)	(46,340)
Effect of foreign exchange rate changes on cash and cash equivalents	(1,310)	5,125
Net increase/(decrease) in cash, cash equivalents, and restricted cash	(168,600)	39,446
Cash, cash equivalents, and restricted cash at beginning of period	1,233,032	1,079,979
Cash, cash equivalents, and restricted cash at end of period	1,064,432	1,119,425
Supplemental disclosure:
Cash paid for income taxes, net of refunds received	9,467	14,952
Non-cash investing activities and financing activities:
Change in property, plant, and equipment purchased, unpaid at period-end	$ (305)	$ (1,446)