Interim Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 27, 2015	Mar. 28, 2014
Operating activities:
Net income including controlling interest	$ 100,469us-gaap_ProfitLoss	$ 121,795us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33,578us-gaap_DepreciationAndAmortization	25,114us-gaap_DepreciationAndAmortization
Stock-based compensation	34,509us-gaap_ShareBasedCompensation	32,807us-gaap_ShareBasedCompensation
Amortization of premium on investments	4,811	4,594
Excess tax benefit from exercise of stock options	(2,095)	(1,562)
Provision for doubtful accounts	(487)us-gaap_ProvisionForDoubtfulAccounts	507us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes	(7,681)us-gaap_DeferredIncomeTaxExpenseBenefit	(6,302)us-gaap_DeferredIncomeTaxExpenseBenefit
Other non-cash items affecting net income	1,252us-gaap_OtherNoncashIncomeExpense	2,943us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Accounts receivable	(3,457)	(12,186)
Inventories	1,397us-gaap_IncreaseDecreaseInInventories	1,640us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(6,045)	(1,139)
Accounts payable and other liabilities	3,223	5,337
Income taxes, net	12,064	13,386
Deferred revenue	5,486	(7,776)
Other non-current liabilities	916	262
Net cash provided by operating activities	177,940	179,420
Investing activities:
Purchase of investments	(194,613)	(178,830)
Proceeds from sales of investment securities	120,074	63,424
Proceeds from maturities of investment securities	79,885	81,402
Purchases of property, plant and equipment	(78,491)	(17,872)
Payments for business acquisitions, net of cash acquired	(93,516)	0
Purchases of intangible assets	(6,416)	(12,400)
Proceeds from sale of property, plant and equipment and assets held for sale	3	42
Change in restricted cash	(14)	(169)
Net cash provided by/(used in) investing activities	(173,088)	(64,403)
Financing activities:
Proceeds from issuance of common stock	12,638	17,464
Repurchase of common stock	(32,364)	(11,660)
Payment of cash dividend	(20,470)us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Distribution to controlling interest	(5,628)	0
Excess tax benefit from the exercise of stock options	2,095	1,562
Shares repurchased for tax withholdings on vesting of restricted stock	(11,809)us-gaap_PaymentsForRepurchaseOfEquity	(8,358)us-gaap_PaymentsForRepurchaseOfEquity
Net cash used in financing activities	(55,538)	(992)
Effect of foreign exchange rate changes on cash and cash equivalents	(3,792)	477
Net increase/(decrease) in cash and cash equivalents	(54,478)	114,502
Cash and cash equivalents at beginning of period	568,472	454,397
Cash and cash equivalents at end of period	513,994	568,899
Supplemental disclosure:
Cash paid for income taxes, net of refunds received	26,885us-gaap_IncomeTaxesPaid	34,092us-gaap_IncomeTaxesPaid
Capital expenditures incurred, not yet paid	27,824	2,662
Noncash or Part Noncash Acquisition, Consideration Payable	$ 740	$ 0

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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