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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 |  |  |

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- Definition 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash paid related to share-based compensation liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + References No definition available. + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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