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Stockholders' Equity and Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended		2 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Mar. 31, 2012	Nov. 20, 2018	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016	Jun. 21, 2016	Jun. 13, 2016	Nov. 11, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining authorized repurchase amount				$ 411,500,000		$ 411,500,000
Authorized value of common shares to be repurchased										$ 500,000,000.0
Percentage of award vested upon meeting defined market based criteria	33.33%
Restricted stock units liability award	0.2
Stock purchased by employees	0.2
Share-based compensation liabilities paid						$ 7,800,000
Stock-based compensation, period of vest term granted to employees, years						3 years
Cliff vesting period from grant date						3 years
Tax benefit related to stock based compensation					$ 22,600,000	$ 11,700,000		$ 23,100,000
Intrinsic value of option exercised					25,900,000	$ 15,200,000		21,600,000
Granted						1.7
Minimum eligible percentage to receive target number of shares of company's common stock						0.00%
Maximum eligible percentage to receive target number of shares of company's common stock						200.00%
Stock-based compensation expense					68,200,000	$ 65,000,000	$ 68,200,000	65,400,000
Shares repurchased (in shares)				2.3		5.0
Common stock repurchases				$ 88,500,000		$ 187,300,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of forfeiture rates						0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of forfeiture rates						7.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					12,200,000	$ 14,300,000		10,900,000
Unrecognized compensation expense				25,400,000		$ 25,400,000
Weighted average period of unrecognized stock-based compensation, years						2 years 7 months 8 days
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, period of vest term granted to employees, years						4 years
Percentage of vesting for stock options granted to employees						25.00%
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, period of vest term granted to employees, years						5 years
Percentage of vesting for stock options granted to employees						20.00%
Convertible notes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	3 years
Stock-based compensation expense					51,600,000	$ 46,500,000		50,500,000
Unrecognized compensation expense				$ 58,700,000		$ 58,700,000
Weighted average period of unrecognized stock-based compensation, years						1 year 11 months 5 days
Fair value of RSUs vested					$ 39,500,000	$ 38,900,000		$ 28,400,000
Convertible notes | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, period of vest term granted to employees, years						3 years
Percentage of vesting for RSUs granted to employees						25.00%
Convertible notes | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, period of vest term granted to employees, years						4 years
Percentage of vesting for RSUs granted to employees						33.00%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted					0.2	0.6		0.3
Market Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vesting period from grant date						3 years
Granted						0.3	0.1
Vested, weighted average grant date fair value (in usd per share)						$ 49.44	$ 48.98
Minimum eligible percentage to receive target number of shares of company's common stock						0.00%
Maximum eligible percentage to receive target number of shares of company's common stock						200.00%
2008 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized				31.5		31.5
Shares available for grant				8.6		8.6
2012 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares that may be issued under Employee Stock Purchase Plan		2.5
Percentage of common stock price for ESPP		85.00%
Stock-based compensation expense					$ 4,400,000	$ 4,000,000		$ 4,000,000
Nov 11, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized value of common shares to be repurchased											$ 250,000,000
Period available for common stock to be repurchased						3 years
Repurchase of common stock (in shares)					7.3
Total consideration						$ 250,000,000
Jun 21 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized value of common shares to be repurchased									$ 500,000,000
Period available for common stock to be repurchased						5 years
June 21, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock (in shares)						5.3
Repurchased of stock, value						$ 200,100,000
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased (in shares)			1.5
Common stock repurchases			$ 60,600,000

X

- Definition

Represents the number of shares purchased by the CEO resulting in a matching RSU grant.

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Maximum target number percentage of shares issued based on stock performance.

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Minimum target number percentage of shares that would be issued based on stock price performance.

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Number of shares issuable under employee stock purchase plan.

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Percentage of award vested upon meeting defined market based criteria

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Represents the percentage applied to the lower of the common stock price at the beginning of the plan period and end of the plan period to determine the number of shares to be issued under the employee stock purchase plan.

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Represents the percentage of restricted stock units that vest annually per the terms of the typical restricted stock unit grant arrangement.

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Represents the percentage of stock options that vest annually per the terms of the typical stock option grant arrangement.

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The number of grants related to restricted stock which have a required condition to vest other than a service, performance or market condition and are required to be accounted for as a liability award.

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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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Share-based Compensation Arrangement by Share-based Payment Award, Cliff-Vesting Period from Grant Date

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Period of time that must lapse in order for the restricted stock units to vest.

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Stock Repurchased During Period, Total Consideration, Treasury 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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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The net cash inflow or outflow resulting from the entity's share transaction.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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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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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Amount of cash paid related to share-based compensation liabilities.

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- Definition

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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- Definition

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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No definition available.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average grant-date fair value of options vested.

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No definition available.

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Amount of stock repurchase plan authorized.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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