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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. 24, 2016 USD ($) $ / shares shares | Sep. 26, 2015 USD ($) $ / shares shares | Sep. 27, 2014 USD ($) | Nov. 11, 2013 USD ($)
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 |  |  |
Stock Modification Expense |  |  |  | $ 4.0 |  |  |
Tax benefit related to stock based compensation |  |  |  | 23.1 | $ 17.7 | $ 15.3 |
Expense related to the acceleration of vesting for certain options assumed in acquisition |  |  |  | 0.4 | 4.1 | 6.6 |
Intrinsic value of option exercised |  |  |  | $ 21.6 | 42.0 | 34.7 |
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 |  |  |  | $ 65.4 | 59.3 | 50.0 |
Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  | 10.9 | 12.2 | 16.3 |
Unrecognized compensation expense |  |  |  | $ 21.2 |  |  |
Weighted average period of unrecognized stock-based compensation, years |  |  |  | 2 years 9 months 22 days |  |  |
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 |  |  |  | $ 50.5 | 43.7 | 30.6 |
Unrecognized compensation expense |  |  |  | $ 66.6 |  |  |
Weighted average period of unrecognized stock-based compensation, years |  |  |  | 1 year 11 months 27 days |  |  |
Fair value of RSUs vested |  |  |  | $ 28.4 | $ 27.2 | 22.6 |
Performance Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted | shares |  |  |  | 0.2 | 0.3 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value | $ / shares |  |  |  | $ 39.72 | $ 26.58 |  |
Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of forfeiture rates |  |  |  | 0.00% |  |  |
Minimum [Member] | Stock Options [Member] |  |  |  |  |  |  |
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% |  |  |
Minimum [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |
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% |  |  |
Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of forfeiture rates |  |  |  | 7.00% |  |  |
Maximum [Member] | Stock Options [Member] |  |  |  |  |  |  |
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% |  |  |
Maximum [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |
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% |  |  |
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 |  |  |  | 8.3 |  |  |
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 |  |  |  | $ 4.0 | $ 3.4 | $ 3.1 |
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 |  |  |  |  |  |

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