Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 30, 2012		Apr. 01, 2011
Operating activities:
Net income including controlling interest	$ 161,683		$ 169,247
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,103		21,045
Stock-based compensation	23,502		22,000
Amortization of premium on investments	9,306		7,805
Excess tax benefit from exercise of stock options	(425)		(11,305)
Provision for doubtful accounts	132		856
Deferred income taxes	(10,030)		(472)
Other non-cash items affecting net income	2,237		157
Changes in operating assets and liabilities:
Accounts receivable	4,103		(20,218)
Inventories	876		(3,038)
Prepaid expenses and other assets	(1,128)		(3,715)
Accounts payable and accrued liabilities	(10,634)		(13,379)
Income taxes, net	14,108		620
Deferred revenue	836		1,988
Net cash provided by operating activities	214,669		171,591
Investing activities:
Purchases of available-for-sale securities	(122,249)		(368,007)
Proceeds from sales of available-for-sale securities	105,454		115,462
Proceeds from maturities available-for-sale securities	111,515		122,914
Purchases of property, plant and equipment	(30,450)		(19,551)
Acquisitions, net of cash acquired	(575)		(3,350)
Proceeds from sales of property, plant and equipment and assets held for sale	715		2,797
Net cash provided by/(used in) investing activities	64,410		(149,735)
Financing activities:
Proceeds from issuance of common stock, net of shares withheld for taxes	3,524		15,215
Repurchase of common stock	(86,149)	[1]	(75,124)
Excess tax benefit from exercise of stock options	425		11,305
Net cash used in financing activities	(82,200)		(48,604)
Effect of foreign exchange rate changes on cash and cash equivalents	(403)		1,155
Net increase/(decrease) in cash and cash equivalents	196,476		(25,593)
Cash and cash equivalents at beginning of period	551,512		545,861
Cash and cash equivalents at end of period	747,988		520,268
Supplemental disclosure:
Cash paid for income taxes	59,997		64,019
Cash paid for interest	$ 4		$ 205

[1] Cost of share repurchases includes the price paid per share and applicable commissions.