Share-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Jun. 29, 2012		Jul. 01, 2011		Jun. 29, 2012		Jul. 01, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 11,500		$ 8,800		$ 36,700		$ 34,900
Taxes on earnings	(3,728)		(2,942)		(11,776)		(11,827)
Net decrease in net earnings	7,788		5,865		24,879		23,084
Increase (decrease) on Cash flows from operating activities	(1,661)	[1]	(4,282)	[1]	(7,805)	[1]	(21,768)	[1]
Increase (decrease) on Cash flows from financing activities	1,661	[1]	4,282	[1]	7,805	[1]	21,768	[1]
Cost Of Revenues - Product
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	1,107		1,055		3,351		3,013
Cost Of Revenues - Service Contracts And Other
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	317		392		1,184		1,610
Research And Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	1,574		1,174		4,833		4,485
Selling, General And Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 8,518		$ 6,186		$ 27,287		$ 25,803

[1] Amounts represent excess tax benefits from share-based compensation.