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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] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Sep. 27, 2014 |  | 277,972 |  |  |  | 0
Balance at Sep. 27, 2014 | $ 2,063.0 | $ 2.8 | $ 5,658.2 | $ (3,600.6) | $ 2.6 | $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 3,036 |  |  |  |
Exercise of stock options | 57.3 | $ 0.0 | 57.3 |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  | 949 |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (12.9) |  | (12.9) |  |  |
Common stock issued under the employee stock purchase plan (in shares) |  | 538 |  |  |  |
Common stock issued under the employee stock purchase plan | 12.0 |  | 12.0 |  |  |
Stock-based compensation expense | 54.6 |  | 54.6 |  |  |
Excess tax benefit from 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 |  |  | 131.6 |  |
Foreign currency translation adjustment | (20.6) |  |  |  | (20.6) |
Amounts reclassified out of cumulative translation adjustment | 9.6 |  |  |  | 9.6 |
Adjustment to minimum pension liability, net | (0.2) |  |  |  | (0.2) |
Unrealized losses on derivatives, net of taxes | (3.9) |  |  |  | (3.9) |
Other-than-temporary impairment of marketable security reclassified out of accumulated other comprehensive income (loss) | 7.8 |  |  |  | 7.8 |
Unrealized losses on marketable securities | (9.8) |  |  |  | (9.8) |
Interest cost of interest rate cap reclassified to statement of income | 0.0 |  |  |  |  |
Net realized gains on marketable securities reclassified out of accumulated other comprehensive income (loss) | 0.0 |  |  |  |  |
Balance (in shares) at Sep. 26, 2015 |  | 282,495 |  |  |  | 0
Balance at Sep. 26, 2015 | 2,079.2 | $ 2.8 | 5,559.9 | (3,469.0) | (14.5) | $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 1,233 |  |  |  |
Exercise of stock options | 24.1 | $ 0.1 | 24.0 |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  | 820 |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (16.4) |  | (16.4) |  |  |
Common stock issued under the employee stock purchase plan (in shares) |  | 467 |  |  |  |
Common stock issued under the employee stock purchase plan | 14.4 |  | 14.4 |  |  |
Stock-based compensation expense | 62.3 |  | 62.3 |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  | 7,289
Repurchase of common stock | (250.0) |  |  |  |  | $ (250.0)
Excess tax benefit from 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 |  |  | 330.8 |  |
Foreign currency translation adjustment | (10.4) |  |  |  | (10.4) |
Adjustment to minimum pension liability, net | (0.7) |  |  |  | (0.7) |
Unrealized losses on derivatives, net of taxes | (3.4) |  |  |  | (3.4) |
Unrealized losses on marketable securities | (1.1) |  |  |  | (1.1) |
Interest cost of interest rate cap reclassified to statement of income | 3.9 |  |  |  | 3.9 |
Net realized gains on marketable securities reclassified out of accumulated other comprehensive income (loss) | (6.1) |  |  |  | (6.1) |
Balance (in shares) at Sep. 24, 2016 |  | 285,015 |  |  |  | 7,289
Balance at Sep. 24, 2016 | $ 2,142.7 | $ 2.9 | 5,560.3 | (3,138.2) | (32.3) | $ (250.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) | 1,400 | 1,427 |  |  |  |
Exercise of stock options | $ 33.1 | $ 0.0 | 33.1 |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  | 939 |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (19.7) |  | (19.7) |  |  |
Common stock issued under the employee stock purchase plan (in shares) |  | 472 |  |  |  |
Common stock issued under the employee stock purchase plan | 15.0 |  | 15.0 |  |  |
Stock-based compensation expense | 68.2 |  | 68.2 |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  | 5,271
Repurchase of common stock | (200.1) |  |  |  |  | $ (200.1)
Reclassification of liability award to equity | 7.8 |  | 7.8 |  |  |
Reacquisition of equity component from convertible notes repurchase, net of taxes | (33.9) |  | (33.9) |  |  |
Net income | 755.5 |  |  | 755.5 |  |
Foreign currency translation adjustment | 7.6 |  |  |  | 7.6 |
Adjustment to minimum pension liability, net | 0.9 |  |  |  | 0.9 |
Unrealized losses on derivatives, net of taxes | 0.8 |  |  |  | 0.8 |
Unrealized losses on marketable securities | 2.3 |  |  |  | 2.3 |
Interest cost of interest rate cap reclassified to statement of income | 6.9 |  |  |  | 6.9 |
Net realized gains on marketable securities reclassified out of accumulated other comprehensive income (loss) | (2.4) |  |  |  | (2.4) |
Balance (in shares) at Sep. 30, 2017 |  | 287,853 |  |  |  | 12,560
Balance at Sep. 30, 2017 | $ 2,784.7 | $ 2.9 | $ 5,630.8 | $ (2,382.7) | $ (16.2) | $ (450.1)

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