Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Currently payable:
Federal	$ 1,163	$ 5,617	$ (3,069)
State	114	1,022	89
Foreign	107,487	116,022	48,039
Currently payable total	108,764	122,661	45,059
Deferred:
Federal	26,334	1,413	(8,131)
State	(489)	(153)	(439)
Foreign	(20,414)	(30,510)	(1,095)
Deferred total	5,431	(29,250)	(9,665)
Provision for income taxes	114,195	93,411	35,394
Components of income (loss) before income taxes
United States	65,272	25,540	(44,029)
Foreign	296,283	276,515	166,925
Income from continuing operations before income taxes	$ 361,555	$ 302,055	$ 122,896
Blended income tax expense rate	24.50%
U.S. Federal statutory rate	21.00%	35.00%	35.00%
Reconciliation of income tax expense (benefit) at U.S. Federal statutory rate
Federal statutory tax expense	$ 88,684	$ 105,719	$ 43,015
Valuation allowance	4,263	4,454	1,441
Foreign taxes at rates greater (less) than U.S. rates, net	8,417	(12,346)	(5,642)
Stock-based compensation	(8,536)	3,969	2,161
State income taxes, net of federal income tax benefit	(373)	398	(198)
Research and development credit	(6,972)	(7,884)	(4,408)
Deferred compensation	(560)	(1,022)	(428)
Release of foreign unrecognized tax benefits	(352)	(538)	(4,961)
Release of interest accrued for unrecognized tax benefits	(156)	(78)	(1,508)
Reversal of Competent Authority	0	0	4,328
U.S. tax reform impact	26,653	0	0
Other	3,127	739	1,594
Provision for income taxes	$ 114,195	$ 93,411	$ 35,394
Effective tax rate	31.60%	30.90%	28.80%
Foreign subsidiaries, transition tax on accumulated foreign earnings	$ 26,700
Estimated deemed repatriation charge	17,800
Anticipated repatriation of investment in a foreign subsidiary	20,300
Deferred tax remeasurement charge	15,500
Accrual for withholding tax and state income tax	13,700
Tax rate reduced by available current year foreign tax credits		10.50%
Effective tax rate on income before income taxes		31.60%
Income taxes payable/receivable	474	$ 66,820	$ 7,384
Deferred tax assets:
Reserves and accruals not currently deductible	36,467	52,803
Operating loss carryforwards and tax credits	67,068	61,371
Deferred service revenue	2,682	2,987
Inventory capitalization	2,450	7,116
Stock-based compensation	5,267	7,839
Competent authority offset to transfer pricing tax reserves	10,585	12,948
Accumulated translation adjustment	432	0
Other	351	4,567
Total gross deferred tax assets	125,302	149,631
Valuation allowance	(33,731)	(28,745)
Total net deferred tax assets	91,571	120,886
Deferred tax liabilities:
Gain on issuance of stock by subsidiary	0	22,378
Depreciation and amortization	39,358	60,956
U.S. tax reform impacts	13,694	0
Accumulated translation adjustment	0	234
Total gross deferred tax liabilities	53,052	83,568
Net deferred tax assets	38,519	37,318
Deferred tax assets, valuation allowance increase (decrease)	5,000
Classification of net deferred tax assets on consolidated balance sheets
Non-current deferred income tax assets	64,858	82,691
Non-current deferred income tax liabilities	(26,339)	(45,373)
Net deferred tax assets	38,519	37,318
Various tax attribute carryforwards
Operating loss carryforwards and tax credits	67,068	61,371
Accounting Standards Update 2016-09
Deferred:
Provision for income taxes	12,800
Reconciliation of income tax expense (benefit) at U.S. Federal statutory rate
Provision for income taxes	12,800
Tax benefit credit to APIC when recognized
Various tax attribute carryforwards
Foreign tax credit carry forwards	13,000
SINGAPORE
Reconciliation of income tax expense (benefit) at U.S. Federal statutory rate
Income taxes payable/receivable	2,500	$ 1,100	$ 700
Foreign
Deferred tax assets:
Operating loss carryforwards and tax credits	48,700
Various tax attribute carryforwards
Operating loss carryforwards and tax credits	48,700
Foreign operating loss carryforwards, not subject to expiration	37,400
Operating loss carryforwards, subject to expiration	11,300
Valuation allowance recorded against foreign net operating loss carryforwards	9,900
Federal Government
Deferred tax assets:
Operating loss carryforwards and tax credits	8,300
Various tax attribute carryforwards
Operating loss carryforwards and tax credits	8,300
State Government
Deferred tax assets:
Operating loss carryforwards and tax credits	30,800
Various tax attribute carryforwards
Operating loss carryforwards and tax credits	30,800
Federal | Subject to Expiration Dates
Various tax attribute carryforwards
R&D credit carryforwards	33,500
CALIFORNIA
Various tax attribute carryforwards
Operating loss carryforwards, subject to expiration	7,400
Valuation allowance, net of federal benefit, recorded against California R&D credit carryforwards	25,400
CALIFORNIA | Not Subject to Expiration Dates
Various tax attribute carryforwards
R&D credit carryforwards	30,300
Other states besides California
Various tax attribute carryforwards
Valuation allowance, net of federal benefit, recorded against California R&D credit carryforwards	2,800
Other states besides California | Subject to Expiration Dates
Various tax attribute carryforwards
R&D credit carryforwards	$ 3,400