Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Compensation Plans (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 29, 2013	Jun. 23, 2012	Jun. 29, 2013	Jun. 23, 2012
Compensation Plans
Total stock based compensation expense recognized in the Consolidated Statements of Operations	$ 6.1	$ 4.4	$ 21.2	$ 13.6
Employee stock purchase plan
Compensation Plans
Average expected life			6 months	6 months
Average volatility (as a percent)			86.00%	61.00%
Risk-free interest rate (as a percent)			0.13%	0.09%
Weighted average fair value (in dollars per share)			$ 14.38	$ 10.46
Stock options
Compensation Plans
Average expected life			6 years	6 years
Average volatility (as a percent)			81.00%	68.00%
Risk-free interest rate (as a percent)			1.02%	1.37%
Weighted average fair value (in dollars per share)			$ 31.17	$ 32.02
RSUs/RSAs \| 2006 Plan \| Minimum
Compensation Plans
Vesting period of award			3 years
RSUs/RSAs \| 2006 Plan \| Maximum
Compensation Plans
Vesting period of award			4 years
PSUs
Compensation Plans
Vesting period of award			3 years