Interim Condensed Consolidated Statements Of Cash Flows - USD ($)	9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017
Operating activities:
Net income including controlling interest	$ 72,575,000	$ 180,487,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	61,398,000	64,543,000
Stock-based compensation	53,476,000	48,940,000
Amortization of premium on investments	2,046,000	2,077,000
Provision for doubtful accounts	2,653,000	1,167,000
Deferred income taxes	47,145,000	(11,446,000)
Other non-cash items affecting net income	5,147,000	2,547,000
Changes in operating assets and liabilities:
Accounts receivable	(78,480,000)	(7,576,000)
Inventories	(508,000)	(6,840,000)
Prepaid expenses and other assets	(13,719,000)	(10,657,000)
Accounts payable and other liabilities	(12,781,000)	14,877,000
Income taxes, net	102,422,000	19,033,000
Deferred revenue	(366,000)	(560,000)
Other non-current liabilities	(537,000)	773,000
Net cash provided by operating activities	240,471,000	297,365,000
Investing activities:
Purchase of investments	(151,585,000)	(204,447,000)
Proceeds from sales of investment securities	72,090,000	36,579,000
Proceeds from maturities of investment securities	194,038,000	126,199,000
Purchases of property, plant and equipment	(54,869,000)	(81,668,000)
Payments for business acquisitions, net of cash acquired	6,563,000	0
Purchases of intangible assets	(12,543,000)	(5,250,000)
Change in restricted cash	(491,000)	(2,542,000)
Net cash provided by/(used in) investing activities	40,077,000	(131,129,000)
Financing activities:
Proceeds from issuance of common stock	85,941,000	47,765,000
Repurchase of common stock	(90,480,000)	(74,994,000)
Payment of cash dividend	(49,596,000)	(42,768,000)
Distribution to controlling interest	(1,022,000)	(2,094,000)
Shares repurchased for tax withholdings on vesting of restricted stock	(21,189,000)	(16,875,000)
Net cash used in financing activities	(76,346,000)	(88,966,000)
Effect of foreign exchange rate changes on cash and cash equivalents	(1,598,000)	(766,000)
Net increase/(decrease) in cash and cash equivalents	202,604,000	76,504,000
Cash and cash equivalents at beginning of period	627,017,000	516,112,000
Cash and cash equivalents at end of period	829,621,000
Supplemental disclosure:
Cash paid for income taxes, net of refunds received	48,931,000	44,694,000
Non-cash investing activities:
Net change in PP&E purchased and unpaid at period-end	4,820,000	(11,614,000)
Purchase consideration payable for acquisition	750,000	0
Purchase consideration payable for intangibles	$ 200,000	$ 0