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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions | Total | Common Stock [Member] | Additional Paid-in-Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income [Member] | Accumulated Translation Adjustment [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Sep. 28, 2013 | $ 1,941.5 | $ 2.7 | $ 5,536.3 | $ (3,616.4) | $ 20.4 |  | $ (1.5)
Balance (in shares) at Sep. 28, 2013 |  | 272,036 |  |  |  |  | 219
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options | 70.6 | $ 0.1 | 70.5 |  |  |  |
Exercise of stock options (in shares) |  | 4,697 |  |  |  |  |
Issuance of common stock to employees upon vesting of restricted stock units, net of shares withheld for employee taxes | (9.8) |  | (9.8) |  |  |  |
Issuance of common stock to employees upon vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  | 846 |  |  |  |  |
Issuance of common stock under the employee stock purchase plan | 10.9 |  | 10.9 |  |  |  |
Issuance of common shares under the employee stock purchase plan (in shares) |  | 612 |  |  |  |  |
Stock-based compensation expense | 49.5 |  | 49.5 |  |  |  |
Excess tax benefit from employee equity awards | 0.8 |  | 0.8 |  |  |  |
Net income | 17.3 |  |  |  |  |  |
Foreign currency translation adjustment | 13.3 |  |  |  | 13.3 |  |
Adjustment to minimum pension liability, net | (1.3) |  |  |  | (1.3) |  |
Payments for Repurchase of Common Stock | 0.0 |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | 0.0 |  |  |  |  |  |
Retirement of treasury shares | 0.0 |  |  | (1.5) |  |  | $ 1.5
Retirement of treasury shares (in shares) |  | (219) |  |  |  |  | (219)
Unrealized losses on marketable securities | (3.2) |  |  |  | (3.2) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0.0 |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0.0 |  |  |  |  |  |
Balance at Sep. 27, 2014 | 2,063.0 | $ 2.8 | 5,658.2 | (3,600.6) | 2.6 |  | $ 0.0
Balance (in shares) at Sep. 27, 2014 |  | 277,972 |  |  |  |  | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options | 57.3 |  | 57.3 |  |  |  |
Exercise of stock options (in shares) |  | 3,036 |  |  |  |  |
Issuance of common stock to employees upon vesting of restricted stock units, net of shares withheld for employee taxes | (12.9) |  | (12.9) |  |  |  |
Issuance of common stock to employees upon vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  | 949 |  |  |  |  |
Issuance of common stock under the employee stock purchase plan | 12.0 |  | 12.0 |  |  |  |
Issuance of common shares under the employee stock purchase plan (in shares) |  | 538 |  |  |  |  |
Stock-based compensation expense | 54.6 |  | 54.6 |  |  |  |
Excess tax benefit from employee equity awards | 7.6 |  | 7.6 |  |  |  |
Reacquisition of equity component from convertible notes repurchase, net of taxes | (216.9) |  | (216.9) |  |  |  |
Net income | 131.6 |  |  |  |  |  |
Foreign currency translation adjustment | 20.6 |  |  |  | 20.6 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 17.4 |  |  |  | 7.8 | $ 9.6 |
Adjustment to minimum pension liability, net | (0.2) |  |  |  | (0.2) |  |
Payments for Repurchase of Common Stock | 0.0 |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | 3.9 |  |  |  | (3.9) |  |
Unrealized losses on marketable securities | (9.8) |  |  |  | (9.8) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0.0 |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0.0 |  |  |  |  |  |
Balance at Sep. 26, 2015 | 2,079.2 | $ 2.8 | 5,559.9 | (3,469.0) | (14.5) |  | $ 0.0
Balance (in shares) at Sep. 26, 2015 |  | 282,495 |  |  |  |  | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Other than temporary impairment | 7.8 |  |  |  |  |  |
Exercise of stock options | $ 24.1 | $ 0.1 | 24.0 |  |  |  |
Exercise of stock options (in shares) | 1,200 | 1,233 |  |  |  |  |
Issuance of common stock to employees upon vesting of restricted stock units, net of shares withheld for employee taxes | $ (16.4) |  | (16.4) |  |  |  |
Issuance of common stock to employees upon vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  | 820 |  |  |  |  |
Issuance of common stock under the employee stock purchase plan | 14.4 |  | 14.4 |  |  |  |
Issuance of common shares under the employee stock purchase plan (in shares) |  | 467 |  |  |  |  |
Stock-based compensation expense | 62.3 |  | 62.3 |  |  |  |
Excess tax benefit from employee equity awards | 10.5 |  | 10.5 |  |  |  |
Reacquisition of equity component from convertible notes repurchase, net of taxes | (94.4) |  | (94.4) |  |  |  |
Net income | 330.8 |  |  |  |  |  |
Foreign currency translation adjustment | 10.4 |  |  |  | 10.4 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (2.2) |  |  |  |  | $ 0.0 |
Adjustment to minimum pension liability, net | (0.7) |  |  |  | (0.7) |  |
Stock Repurchased During Period, Shares |  |  |  |  |  |  | 7,289
Payments for Repurchase of Common Stock | (250.0) |  |  |  |  |  | $ 250.0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | 3.4 |  |  |  | (3.4) |  |
Unrealized losses on marketable securities | (1.1) |  |  |  | (1.1) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 3.9 |  |  |  | 3.9 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (6.1) |  |  |  | (6.1) |  |
Balance at Sep. 24, 2016 | $ 2,142.7 | $ 2.9 | $ 5,560.3 | $ (3,138.2) | $ (32.3) |  | $ (250.0)
Balance (in shares) at Sep. 24, 2016 |  | 285,015 |  |  |  |  | 7,289

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