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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings | Total | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | ---
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 231 |  |  |  |
Exercise of stock options | 5.8 |  | 5.8 |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes ( in shares) |  | 666 |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (14.3) |  | (14.3) |  |  |
Stock-based compensation expense | 16.4 |  | 16.4 |  |  |
Reacquisition of equity component from convertible notes repurchase, net of taxes | (9.8) |  | (9.8) |  |  |
Net loss | 406.7 |  |  | 406.7 |  |
Other comprehensive income activity | 4.5 |  |  |  | 4.5 |
Balance (in shares) at Dec. 30, 2017 |  | 288,750 |  |  |  | 12,560
Balance at Dec. 30, 2017 | 3,194.0 | $ 2.9 | 5,628.9 | (1,976.0) | (11.7) | $ (450.1)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net loss | (274.7) |  |  |  |  |
Balance (in shares) at Mar. 31, 2018 |  | 289,187 |  |  |  | 15,376
Balance at Mar. 31, 2018 | 2,445.7 | $ 2.9 | 5,657.4 | (2,657.4) | (0.6) | $ (556.6)
Balance (in shares) at Dec. 30, 2017 |  | 288,750 |  |  |  | 12,560
Balance at Dec. 30, 2017 | 3,194.0 | $ 2.9 | 5,628.9 | (1,976.0) | (11.7) | $ (450.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 154 |  |  |  |
Exercise of stock options | 2.9 |  | 2.9 |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes ( in shares) |  | 79 |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (1.2) |  | (1.2) |  |  |
Common stock issued under the employee stock purchase plan (in shares) |  | 204 |  |  |  |
Common stock issued under the employee stock purchase plan | 7.4 |  | 7.4 |  |  |
Stock-based compensation expense | 19.5 |  | 19.5 |  |  |
Reacquisition of equity component from convertible notes repurchase, net of taxes | (0.1) |  | (0.1) |  |  |
Net loss | (681.4) |  |  | (681.4) |  |
Other comprehensive income activity | 11.1 |  |  |  | 11.1 |
Repurchase of common stock (in shares) |  |  |  |  |  | 2,816
Repurchase of common stock | (106.5) |  |  |  |  | $ (106.5)
Balance (in shares) at Mar. 31, 2018 |  | 289,187 |  |  |  | 15,376
Balance at Mar. 31, 2018 | 2,445.7 | $ 2.9 | 5,657.4 | (2,657.4) | (0.6) | $ (556.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 193 |  |  |  |
Exercise of stock options | 3.9 |  | 3.9 |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes ( in shares) |  | 25 |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (0.5) |  | (0.5) |  |  |
Stock-based compensation expense | 17.2 |  | 17.2 |  |  |
Reacquisition of equity component from convertible notes repurchase, net of taxes | (30.9) |  | (30.9) |  |  |
Net loss | 112.9 |  |  | 112.9 |  |
Other comprehensive income activity | (18.0) |  |  |  | (18.0) |
Repurchase of common stock (in shares) |  |  |  |  |  | 2,161
Repurchase of common stock | (80.8) |  |  |  |  | $ (80.8)
Balance (in shares) at Jun. 30, 2018 |  | 289,405 |  |  |  | 17,537
Balance at Jun. 30, 2018 | 2,449.5 | $ 2.9 | 5,647.1 | (2,544.5) | (18.6) | $ (637.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 218 |  |  |  |
Exercise of stock options | 4.8 |  | 4.8 |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes ( in shares) |  | 33 |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (0.6) |  | (0.6) |  |  |
Common stock issued under the employee stock purchase plan (in shares) |  | 244 |  |  |  |
Common stock issued under the employee stock purchase plan | 8.2 |  | 8.2 |  |  |
Stock-based compensation expense | 11.9 |  | 11.9 |  |  |
Reacquisition of equity component from convertible notes repurchase, net of taxes | (0.1) |  | (0.1) |  |  |
Net loss | 50.5 |  |  | 50.5 |  |
Other comprehensive income activity | (6.9) |  |  |  | (6.9) |
Repurchase of common stock (in shares) |  |  |  |  |  | 2,275
Repurchase of common stock | (88.5) |  |  |  |  | $ (88.5)
Balance (in shares) at Sep. 29, 2018 |  | 289,900 |  |  |  | 19,812
Balance at Sep. 29, 2018 | 2,428.8 | $ 2.9 | 5,671.3 | (2,494.0) | (25.5) | $ (725.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accounting standard transition adjustment | Accounting Standards Update 2014-09 | 6.4 |  |  | 6.4 |  |
Accounting standard transition adjustment | Accounting Standards Update 2016-16 [Member] | (2.5) |  |  | (2.5) |  |
Exercise of stock options (in shares) |  | 373 |  |  |  |
Exercise of stock options | 9.1 |  | 9.1 |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes ( in shares) |  | 575 |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (11.6) |  | (11.6) |  |  |
Stock-based compensation expense | 17.1 |  | 17.1 |  |  |
Net loss | 98.6 |  |  |  |  |
Other comprehensive income activity | (6.4) |  |  |  | (6.4) |
Repurchase of common stock (in shares) |  |  |  |  |  | 3,712
Repurchase of common stock | (150.1) |  |  |  |  | $ (150.1)
Balance (in shares) at Dec. 29, 2018 |  | 290,848 |  |  |  | 23,524
Balance at Dec. 29, 2018 | 2,394.4 | $ 2.9 | 5,685.9 | (2,386.5) | (31.9) | $ (876.0)
Balance (in shares) at Sep. 29, 2018 |  | 289,900 |  |  |  | 19,812
Balance at Sep. 29, 2018 | 2,428.8 | $ 2.9 | 5,671.3 | (2,494.0) | (25.5) | $ (725.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net loss | (174.0) |  |  |  |  |
Balance (in shares) at Mar. 30, 2019 |  | 291,561 |  |  |  | 23,524
Balance at Mar. 30, 2019 | 2,159.8 | $ 2.9 | 5,722.5 | (2,659.1) | (30.5) | $ (876.0)
Balance (in shares) at Dec. 29, 2018 |  | 290,848 |  |  |  | 23,524
Balance at Dec. 29, 2018 | 2,394.4 | $ 2.9 | 5,685.9 | (2,386.5) | (31.9) | $ (876.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 454 |  |  |  |
Exercise of stock options | 11.6 |  | 11.6 |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes ( in shares) |  | 33 |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (0.4) |  | (0.4) |  |  |
Common stock issued under the employee stock purchase plan (in shares) |  | 226 |  |  |  |
Common stock issued under the employee stock purchase plan | 7.9 |  | 7.9 |  |  |
Stock-based compensation expense | 17.5 |  | 17.5 |  |  |
Net loss | (272.6) |  |  |  |  |
Other comprehensive income activity | 1.4 |  |  |  | 1.4 |
Balance (in shares) at Mar. 30, 2019 |  | 291,561 |  |  |  | 23,524
Balance at Mar. 30, 2019 | $ 2,159.8 | $ 2.9 | $ 5,722.5 | $ (2,659.1) | $ (30.5) | $ (876.0)

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