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- Definition

ASR Shares Repurchased during the period

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Amount paid during the period under ASR Agreement

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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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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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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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Number of shares authorized for issuance under share-based payment arrangement.

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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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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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Stockholders' Equity and Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended		3 Months Ended					12 Months Ended
	Dec. 31, 2013	Mar. 31, 2012	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 28, 2019	Sep. 29, 2018	Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018	Dec. 11, 2019	Jun. 21, 2016	Jun. 13, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized value of common shares to be repurchased													$ 500,000,000.0
Percentage of award vested upon meeting defined market based criteria	33.33%
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								$ 9,500,000	$ 8,900,000	$ 11,700,000
Intrinsic value of option exercised								$ 44,800,000	26,100,000	15,200,000
Granted								0.9
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								$ 83,300,000	$ 62,000,000.0	$ 65,000,000.0
Shares repurchased (in shares)						2.3			4.8	5.0
Common stock repurchases							$ 88,500,000		$ 200,100,000	$ 187,300,000
ASR Shares Repurchased during the period				$ 600,000
ASR Authorized			$ 205		$ 205,000,000
Amount paid during the period under ASR Agreement					$ 164,000,000.0
June 13, 2019 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased (in shares)					3.9
Common stock repurchases					$ 210,900,000
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								6.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense								$ 15,500,000	14,100,000	14,300,000
Unrecognized compensation expense			19,500,000					$ 19,500,000
Weighted average period of unrecognized stock-based compensation, years								2 years 3 months 18 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%
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, period of vest term granted to employees, years								3 years
Stock-based compensation expense								$ 63,300,000	43,700,000	46,500,000
Unrecognized compensation expense			$ 50,000,000.0					$ 50,000,000.0
Weighted average period of unrecognized stock-based compensation, years								1 year 8 months 12 days
Fair value of RSUs vested								$ 34,900,000	$ 34,600,000	$ 38,900,000
RSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for RSUs granted to employees								33.00%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted								0.1	0.1	0.6
Vested, weighted average grant date fair value (in usd per share)								$ 45.38	$ 40.97	$ 40.86
Market Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vesting period from grant date								3 years
Granted								0.1	0.1	0.3
Vested, weighted average grant date fair value (in usd per share)								$ 43.54	$ 55.13	$ 49.44
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%
PSU Free Cash Flow [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted								0.1
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted								0.6	0.9	0.8
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			5.7					5.7
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								$ 4,500,000	$ 4,200,000	$ 4,000,000.0
Jun 21 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized value of common shares to be repurchased												$ 500,000,000.0
Period available for common stock to be repurchased								5 years
Dec 11, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining authorized repurchase amount			$ 262,400,000					$ 262,400,000
Authorized value of common shares to be repurchased											$ 500,000,000.0
Shares repurchased (in shares)								5.1
Common stock repurchases								$ 237,700,000