Stock-Based Compensation - Restricted Stock Units (Detail) (Restricted Stock Units (RSUs) [Member], USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 28, 2012	Sep. 28, 2012
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Numbers of Shares, Beginning Balance	4.7	3.7
Restricted stock, Number of share granted	0.1	1.5
Restricted stock, Number of share vested	(0.1)	(0.5)
Numbers of Shares, Ending Balance	4.7	4.7
Weighted Average Grant Date Fair Value Per Share, Beginning Balance	$ 36.12	$ 33.19
Number of share, Expected to vest after December 28, 2012	4.5
Restricted stock, Granted, Weighted Average Grant Date Fair Value Per Share	$ 35.56	$ 43.06
Restricted stock, Vested, Weighted Average Grant Date Fair Value Per Share	$ 30.18	$ 35.32
Weighted Average Grant Date Fair Value Per Share, Ending Balance	$ 35.24	$ 36.12
Weighted Average Grant Date Fair Value Per Share, Expected to vest after September 28, 2012	$ 35.24