Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) Statement (USD $) In Millions, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Common Stock Outstanding [Member]	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss
Beginning balance at Sep. 30, 2011	$ 1,609.3	$ 46.6	$ (130.8)	$ 1,796.0		$ (101.2)	$ (1.3)
Beginning balance (in shares) at Sep. 30, 2011			9.0
Common stock, shares, outstanding beginning balance (in shares) at Sep. 30, 2011		186.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	202.0					202.0
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes, shares		6.7	0.8
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes	56.5	1.7	(18.6)	73.4
Share-based Compensation expense	71.9			71.9
Reacquisition of equity components of convertible notes	(21.5)			(21.5)
Share repurchase program (in shares)					(0.8)
Share repurchase program (in shares)			0.8
Share repurchase program	(12.4)		(12.4)		(0.2)
Share repurchase program				0.2
Other comprehensive loss	(0.3)						(0.3)
Ending balance at Sep. 28, 2012	1,905.5	48.1	(161.8)	1,920.0		100.8	(1.6)
Common stock, shares, outstanding ending balance (in shares) at Sep. 28, 2012		192.3
Ending balance (in shares) at Sep. 28, 2012			10.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	278.1					278.1
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes, shares		3.7	0.9
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes	31.1	0.9	(18.6)	48.8
Share-based Compensation expense	70.6			70.6
Share repurchase program (in shares)					(8.1)
Share repurchase program (in shares)			8.1
Share repurchase program	(184.9)		(184.9)		(2.0)
Share repurchase program				2.0
Other comprehensive loss	(0.7)						(0.7)
Ending balance at Sep. 27, 2013	2,101.1	47.0	(365.3)	2,041.4		378.9	(0.9)
Common stock, shares, outstanding ending balance (in shares) at Sep. 27, 2013	187.9	187.9
Ending balance (in shares) at Sep. 27, 2013			19.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	457.7					457.7
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes, shares		5.8	0.9
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes	109.2	1.4	(22.1)	129.9
Share-based Compensation expense	75.8			75.8
Share repurchase program (in shares)					(4.5)
Share repurchase program (in shares)			4.5
Share repurchase program	(165.7)		(165.7)		(1.1)
Share repurchase program				1.1
Dividends declared	(41.7)					(41.7)
Other comprehensive loss	(4.0)						(4.0)
Ending balance at Oct. 03, 2014	$ 2,532.4	$ 47.3	$ (553.1)	$ 2,248.2		$ 794.9	$ (4.9)
Common stock, shares, outstanding ending balance (in shares) at Oct. 03, 2014	189.2	189.2
Ending balance (in shares) at Oct. 03, 2014			25.0