Borrowings and Credit Arrangements - Convertible Notes and Related Equity Components (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Sep. 29, 2012
2007 Notes [Member]
Schedule Of Borrowings [Line Items]
Notes principal amount	$ 775,000	$ 775,000
Unamortized discount	(40,524)	(50,591)
Net carrying amount	734,476	724,409
Equity component, net of taxes	233,353	233,353
2010 Notes [Member]
Schedule Of Borrowings [Line Items]
Notes principal amount	450,000	450,000
Unamortized discount	(70,199)	(74,062)
Net carrying amount	379,801	375,938
Equity component, net of taxes	60,054	60,054
2012 Notes [Member]
Schedule Of Borrowings [Line Items]
Notes principal amount	500,000	500,000
Unamortized discount	(39,973)	(41,687)
Net carrying amount	460,027	458,313
Equity component, net of taxes	$ 49,195	$ 49,195