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

No definition available.

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Fair value per share based on Monte Carlo simulation.

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Market stock units granted during period.

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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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Share based compensation arrangement by share based payment award number of tranches.

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Share based compensation arrangement by share based payment award trading period considered for determination of average price

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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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Stock-based compensation expense from the acceleration of stock options exchanged in an acquisition. Pursuant to the original terms of the stock options, in the event the employee was terminated after a change-in-control within a certain time period, vesting of the award would be accelerated.

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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 Modification Expense

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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 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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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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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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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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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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Description of share repurchase program, including accounting treatment.

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

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Stockholders' Equity and Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended		12 Months Ended
	Jun. 21, 2016	Dec. 31, 2013 tranche $ / shares shares	Mar. 31, 2012 shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 24, 2016 USD ($) $ / shares shares	Sep. 26, 2015 USD ($) $ / shares shares	Nov. 11, 2013 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market stock units granted during the period \| shares		0.1
Share Based Compensation Arrangement By Share Based Payment Award Number Of Tranches \| tranche		3
Percentage Of Award Vested Upon Meeting Defined Market Based Criteria		33.33%
Share Based Compensation Arrangement By Share Based Payment Award Trading Period Considered For Determination Of Average Price		30 days
Valuation of MSUs using Monte Carlo simulation model \| $ / shares		$ 18.65
Share Based Compensation Arrangement Restricted Stock Units Liability Award \| shares		0.2
Common Stock Purchased By Employee \| shares		0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid				$ 7.8
Stock-based compensation, period of vest term granted to employees, years				3 years
Share-based Compensation Arrangement by Share-based Payment Award, Cliff-Vesting Period from Grant Date				3 years
Stock Modification Expense				$ 4.0
Tax benefit related to stock based compensation				22.6	$ 23.1	$ 17.7
Expense related to the acceleration of vesting for certain options assumed in acquisition					0.4	4.1
Intrinsic value of option exercised				$ 25.9	21.6	42.0
Granted \| shares				1.0
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				$ 68.2	65.4	59.3
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 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 12.2	10.9	12.2
Unrecognized compensation expense				$ 21.0
Weighted average period of unrecognized stock-based compensation, years				2 years 5 months 22 days
Stock Options [Member] \| 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 [Member] \| 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%
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shared Based Compensation Arrangement Restricted Stock Vesting Period		3 years
Stock-based compensation expense				$ 51.6	50.5	43.7
Unrecognized compensation expense				$ 54.6
Weighted average period of unrecognized stock-based compensation, years				1 year 9 months 27 days
Fair value of RSUs vested				$ 38.5	$ 28.4	$ 27.2
Restricted Stock Units [Member] \| 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%
Restricted Stock Units [Member] \| 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 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted \| shares				0.2	0.2	0.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value \| $ / shares				$ 38.84	$ 39.72	$ 26.58
Market Based Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Cliff-Vesting Period from Grant Date				3 years
Granted \| shares				0.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value \| $ / shares				$ 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 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized \| shares				31.5
Shares available for grant \| shares				6.8
2012 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares that may be issued under Employee Stock Purchase Plan \| shares			2.5
Percentage of common stock price for ESPP			85.00%
Stock-based compensation expense				$ 4.4	$ 4.0	$ 3.4
Nov 11, 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized value of common shares to be repurchased							$ 250.0
Period available for common stock to be repurchased				3 years
Treasury Stock, Shares, Acquired \| shares					7.3
Stock Repurchased During Period, Total Consideration				$ 250.0
Jun 21 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period available for common stock to be repurchased				5 years
Treasury Stock, Shares, Acquired \| shares				0.0
Treasury Stock Acquired, Repurchase Authorization	500
June 21, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired \| shares				5.3
Stock Repurchased During Period, Value				$ 200.1