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Percentage Of Target Award

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Percentage of vesting per year.

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Share based compensation arrangement by share based payment award maximum value of shares per employee.

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Share based compensation arrangement by share based payment award options becoming exercisable.

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Share-based Compensation Arrangement by Share-based Payment Award, Estimated Forfeiture Rate

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Share-based Compensation Arrangement by Share-based Payment Award, Look Back Commencement Period

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Share-based Compensation Arrangement by Share-based Payment Award, Purchase Period

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Stockholders' Equity And Stock-Based Compensation [Line Items]

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Terms for issuance of stock.

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Year end stock price.

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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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Aggregate dividends declared during the period for each share of common stock outstanding.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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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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Discount rate from fair value on purchase date that participants pay for shares.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The highest quantity of shares an employee can purchase under the plan per period.

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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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Net number of share options (or share units) granted during the period.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount of stock repurchase plan authorized.

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Stockholders' Equity And Stock-Based Compensation (Narrative) (Details) - USD ($)								12 Months Ended				37 Months Ended	41 Months Ended
	Aug. 01, 2019	May 01, 2019	Jan. 30, 2019	Dec. 15, 2018	Dec. 15, 2017	Dec. 15, 2016	Dec. 15, 2015	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2012	Oct. 31, 2010	Mar. 28, 2014	Jul. 31, 2019	Mar. 29, 2019	Jul. 25, 2018	Jan. 25, 2017	Oct. 31, 2014	Feb. 29, 2012	Jul. 31, 2011	Jul. 31, 2010	Nov. 30, 2009
Stockholders' Equity And Stock-Based Compensation [Line Items]
Estimated forfeiture rate, percent								9.78%	9.91%	10.16%
Options granted under the plan								1,253,000
Options outstanding to purchase									7,365,000
Recognized tax benefit from the exercise of ISO and ESPP								$ 353,000	$ 577,000	$ 802,000
Percentage of vesting per year													50.00%
Share based compensation expense								76,580,000	71,249,000	65,343,000
Fair value of restricted stock units vested								$ 69,956,000	64,755,000	51,985,000
Year end stock price								$ 63.79
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period								1,348,000
Employee stock options expected to be recognized over a weighted-average period								6 years 2 months 12 days
Allocated Share-based Compensation Expense								$ 76,580,000	$ 71,249,000	$ 65,343,000
Stock authorized for repurchase								2,000,000,000														$ 250,000,000
Remaining authorization to purchase additional shares								$ 361,000,000
Common stock, dividends declared (in dollars per share)	$ 0.19	$ 0.19	$ 0.19					$ 0.79	$ 0.67	$ 0.58
Class A Common Stock [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Common stock, shares authorized (shares)								500,000,000		500,000,000					500,000,000
Common stock, shares issued (shares)								63,911,270	63,978,752
Class B Common Stock [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Common stock, shares authorized (shares)								500,000,000		500,000,000					500,000,000
Common stock, shares issued (shares)								36,229,820	39,261,035
2005 Stock Plan. [Member] \| Class A Common Stock [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Shares authorized under plan								46,000,000.0
Options outstanding to purchase								7,201,000
Weighted Average Remaining Contractual Life, Options outstanding								6 years 3 months 18 days
Options vested and exercisable								4,355,000
Awards Granted Under 2005 Stock Plan Prior To February 2011 [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Terms for issuance of stock								2
Awards Granted Under 2005 Stock Plan From February 2011 [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Terms for issuance of stock								1.6
Employee Stock Purchase Plan [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Percentage of compensation withheld by employees to purchase common stock								10.00%
Common stock purchase price determined over percentage of closing price								15.00%
Employee Stock Purchase Plan [Member] \| Class A Common Stock [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Maximum value of common stock available for eligible employees								$ 25,000
Maximum number of common stock available for eligible employees								1,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Period								6 months
Share-based Compensation Arrangement by Share-based Payment Award, Look Back Commencement Period								1 year
Additional Stock Approved [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock authorized for repurchase														$ 350,000,000		$ 350,000,000	$ 200,000,000	$ 200,000,000	$ 100,000,000	$ 250,000,000	$ 300,000,000
Employee Stock Option [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock options expected to vest								$ 25,300,000
Employee stock options expected to be recognized over a weighted-average period								2 years 1 month 6 days
Employee Stock Option [Member] \| Options Granted From June 2008 [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Options vesting period											36 months
Percentage of stock option becoming exercisable subjected to date of grant								25.00%
Options maximum vesting period, months											36 months
Restricted Stock Units [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Share based compensation expense								$ 54,650,000	$ 46,162,000	$ 43,171,000
Stock options expected to vest								$ 109,300,000
Employee stock options expected to be recognized over a weighted-average period								2 years 3 months 18 days
Executive Officer [Member] \| Performance-Based Stock Options [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options								1,193,737
Percentage Of Target Award								125.00%
Employee and Officer [Member] \| Restricted Stock Units [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Options vesting period								4 years
Options maximum vesting period, months								4 years
Awards Granted Prior to November 2010 [Member] \| Director [Member] \| Restricted Stock Units [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Options vesting period												3 years	1 year
Options maximum vesting period, months												3 years	1 year
Awards Granted After November 2010 [Member] \| Director [Member] \| Restricted Stock Units [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Options vesting period												2 years
Options maximum vesting period, months												2 years
Awarded Fiscal 2019 [Member] \| Executive Officer [Member] \| Performance-Based Stock Options [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				241,100
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options				301,375
Percentage Of Target Award				125.00%
Awarded Fiscal 2018 [Member] \| Executive Officer [Member] \| Performance-Based Stock Options [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					264,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options					330,000
Percentage Of Target Award					125.00%
Awarded Fiscal 2017 [Member] \| Executive Officer [Member] \| Performance-Based Stock Options [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						276,199
Options outstanding to purchase								758,299
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options						345,248
Percentage Of Target Award						125.00%
Awarded Fiscal 2016 [Member] \| Executive Officer [Member] \| Performance-Based Stock Options [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Options vested and exercisable							334,623
Percentage Of Target Award							125.00%