Interim Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 29, 2017	Dec. 30, 2016
Operating activities:
Net income including controlling interest	$ (81,478)	$ 53,574
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,882	21,810
Stock-based compensation	18,684	17,215
Amortization of premium on investments	742	662
Provision for doubtful accounts	1,119	67
Deferred income taxes	51,074	(3,275)
Other non-cash items affecting net income	587	(376)
Changes in operating assets and liabilities:
Accounts receivable	(50,268)	(5,782)
Inventories	(1,491)	878
Prepaid expenses and other assets	(6,609)	(8,705)
Accounts payable and other liabilities	(35,390)	(11,528)
Income taxes, net	99,551	6,245
Deferred revenue	650	(479)
Other non-current liabilities	96	417
Net cash provided by operating activities	17,149	70,723
Investing activities:
Purchase of investments	(74,479)	(37,073)
Proceeds from sales of investment securities	28,383	7,524
Proceeds from maturities of investment securities	49,476	26,902
Purchases of property, plant and equipment	(19,275)	(22,576)
Purchases of intangible assets	(11,198)	0
Change in restricted cash	(279)	(1,430)
Net cash provided by/(used in) investing activities	(27,372)	(26,653)
Financing activities:
Proceeds from issuance of common stock	41,463	13,991
Repurchase of common stock	(29,993)	(25,001)
Payment of cash dividend	(16,377)	(14,216)
Distribution to controlling interest	(1,021)	(2,094)
Shares repurchased for tax withholdings on vesting of restricted stock	(15,346)	(14,656)
Net cash used in financing activities	(21,274)	(41,976)
Effect of foreign exchange rate changes on cash and cash equivalents	870	(5,368)
Net increase/(decrease) in cash and cash equivalents	(30,627)	(3,274)
Cash and cash equivalents at beginning of period	627,017	516,112
Cash and cash equivalents at end of period	596,390	512,838
Supplemental disclosure:
Cash paid for income taxes, net of refunds received	17,355	13,792
Net change in PP&E purchased and unpaid at period-end	$ 2,333	$ 6,901