Balance Sheet Details (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Oct. 03, 2020
Inventory, Net [Abstract]
Purchased parts and assemblies	$ 115,580		$ 116,957
Work-in-process	170,934		173,871
Finished goods	129,867		135,928
Total inventories	416,381		426,756
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid and refundable income taxes	36,775		50,548
Other taxes receivable	11,644		13,006
Prepaid expenses and other assets	43,395		24,696
Total prepaid expenses and other assets	91,814		88,250
Other Assets, Noncurrent Disclosure [Abstract]
Assets related to deferred compensation arrangements	31,105		39,720
Deferred tax assets	89,921		102,028
Right of use assets, net - operating leases (See Note 11)	84,488		85,905
Right of use assets, net - finance leases (See Note 11)	588		656
Other assets	15,220		14,266
Total other assets	221,322		242,575
Other Liabilities, Current [Abstract]
Accrued payroll and benefits	71,083		54,211
Operating lease liability, current (See Note 11)	16,492		15,366
Finance lease liability, current (See Note 11)	369		399
Deferred revenue	35,357		32,998
Warranty reserve	34,489		35,032
Accrued expenses and other	40,002		36,432
Customer deposits	12,762		9,717
Total other current liabilities	210,554		184,155
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Beginning balance	35,032	$ 36,460
Additions related to current period sales	7,484	10,310
Warranty costs incurred in the current period	(9,217)	(10,972)
Adjustments to accruals related to foreign exchange and other	1,190	126
Ending balance	34,489	$ 35,924
Other Liabilities, Noncurrent [Abstract]
Long-term taxes payable	15,627		15,374
Operating lease liability, long-term (See Note 11)	73,634		75,264
Finance lease liability, long-term (See Note 11)	125		178
Deferred compensation	34,110		42,854
Defined benefit plan liabilities	48,113		45,810
Deferred tax liabilities	16,820		15,721
Deferred revenue	13,020		13,624
Asset retirement obligations liability	6,055		5,892
Other long-term liabilities	4,768		6,357
Total other long-term liabilities	$ 212,272		$ 221,074