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Number of stock options eligible for exchange under the Option Exchange Program in which the options were repriced to the provided price per share.

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Purchase price per right under the Amended and Restated Rights Agreement

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The amount of voting rights. The Series A Junior Participating Preferred Stock carries twenty five thousand times the dividend, liquidation and voting rights of the Company's common stock.

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Maximum forfeiture rate applied to equity awards issued to certain employee groups to determine stock-based compensation expense for the period. The rate is based on an analysis of historical employee exercise and terminations patterns.

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Under the Amended and Restated Rights Agreement, the rights entitles the holder to purchase one twenty-five thousandth of a share of Series A Junior Participating Preferred Stock.

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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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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Stockholders' Equity And Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended							0 Months Ended	12 Months Ended							0 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended			12 Months Ended
	Sep. 24, 2011	Sep. 25, 2010	Sep. 26, 2009	Apr. 03, 2008	Mar. 11, 2008 Number Of Stocks Authorized Former [Member]	Mar. 11, 2008 Number Of Stocks Authorized Later [Member]	Apr. 03, 2008 Series A Preferred Stock [Member]	Apr. 02, 2008 Series A Preferred Stock [Member]	Sep. 24, 2011 Stock Option [Member]	Sep. 25, 2010 Stock Option [Member]	Sep. 26, 2009 Stock Option [Member]	Sep. 24, 2011 Restricted Stock Units [Member]	Sep. 25, 2010 Restricted Stock Units [Member]	Sep. 26, 2009 Restricted Stock Units [Member]	Sep. 24, 2011 2008 Equity Plan [Member]	Jan. 16, 2008 Option Exchange Program [Member]	Apr. 05, 2009 Option Exchange Program [Member]	Apr. 05, 2009 New Options [Member]	Sep. 24, 2011 New Options [Member]	Mar. 11, 2008 Employee Stock Purchase Plan [Member]	Mar. 11, 2008 Employee Stock Purchase Plan [Member]	Sep. 24, 2011 Employee Stock Purchase Plan [Member]	Sep. 24, 2011 Amended And Restated Rights Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized	750,000,000	750,000,000			600,000,000	750,000,000
Purchase price of each Right				$ 60
Share portion entitled to purchase by Right							one twenty-five thousandth
Preferred stock that carries dividend, liquidation and voting rights								25,000
Expiration date of the Right																							January 1, 2013
Shares reserved for issuance															20,000,000
Shares available for grant															8,200,000							95,000
RSU, period of vest term granted to employees, years												four
Percentage of vesting for stock granted to employees									20.00%										25.00%
Percentage of vesting for stock granted to employees												25.00%
Stock-based compensation, period of vest term granted to employees, years									five			three							four
Percentage of forfeiture rate, minimum	0.00%
Percentage of forfeiture rate, maximum	5.00%
Stock-based compensation expense									15,200,000	13,300,000	13,800,000	20,300,000	20,900,000	19,100,000
Tax benefit related to stock based compensation	14,800,000	9,900,000	9,800,000
Unrecognized compensation expense									30,800,000			32,200,000
Weighted average period of unrecognized stock-based compensation, years									3.0			2.4
Exercise price of repriced options before and after repricing																$ 33.31		$ 14.87
Percent of exercise price to last reported closing price																		110.00%
Percent of stock price, ESPP																					95.00%
Number of stock options eligible for exchange																	784,000
Number of stock options granted in Option Exchange Program																		406,000
Total intrinsic value of option exercised	12,265,000	7,300,000	10,500,000
Fair value of RSUs vested												$ 43,200,000	$ 7,500,000	$ 5,000,000
Number of shares that may be issued under Employee Stock Purchase Plan																				400,000