Balance Sheet Details (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2012 M	Apr. 02, 2011	Oct. 01, 2011	Oct. 02, 2010
Inventory, Net [Abstract]
Purchased parts and assemblies	$ 44,614		$ 44,824
Work-in-process	61,557		52,457
Finished goods	50,886		55,104
Total inventories	157,057		152,385
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid and refundable income taxes	13,830		9,193
Other Taxes Receivable	30,031		19,883
Prepaid expenses and other	15,313		15,888
Total prepaid expenses and other assets	59,174		44,964
Other Assets, Noncurrent Disclosure [Abstract]
Assets related to deferred compensation arrangements	21,977		22,737
Deferred tax assets	36,735		37,156
Other assets	4,350		4,289
Total other assets	63,062		64,182
Other Liabilities, Current [Abstract]
Accrued payroll and benefits	27,193		39,639
Deferred income	15,600		14,893
Reserve for warranty	16,812		16,704
Accrued expenses and other	11,881		12,473
Other taxes payable	25,552		11,067
Accrued restructuring charges	0	2,063	634	2,232
Customer deposits	2,381		3,210
Total other current liabilities	99,419		98,620
Product Warranties Disclosures [Abstract]
Weighted average warranty period (months)	15
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance	16,704	13,499
Additions related to current period sales	14,445	12,742
Warranty costs incurred in the current period	(14,319)	(10,825)
Accruals resulting from acquisition	0	178
Adjustment to accruals, including foreign exchange	(18)	(259)
Ending balance	16,812	15,335
Other Liabilities, Noncurrent [Abstract]
Long-term taxes payable	23,240		27,775
Deferred compensation	22,276		22,685
Deferred tax liabilities	1,867		2,194
Deferred income	2,435		2,636
Asset retirement obligations	1,954		1,878
Other long-term liabilities	5,822		5,673
Total other long-term liabilities	$ 57,594		$ 62,841