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Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Sep. 30, 2016 |  | 53,709 |  |  |  |
Beginning balance at Sep. 30, 2016 | $ 462,784 | $ 54 | $ (330) | $ 9,039 | $ 551,509 | $ (97,488)
Beginning Balance Treasury stock (in shares) at Sep. 30, 2016 |  |  | (23) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock option exercise (in shares) |  | 234 |  |  |  |
Stock option exercises | 3,117 |  |  |  | 3,117 |
Vesting of restricted common stock and units (in shares) |  | 984 |  |  |  |
Vesting of restricted common stock and units | 0 | $ 0 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan (in shares) |  | 145 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 5,164 |  |  |  | 5,164 |
Shares repurchased for tax withholdings on restricted stock awards (in shares) |  | (382) |  |  |  |
Shares repurchased for tax withholdings on restricted stock awards | (18,534) | $ 0 |  |  | (18,534) |
Share-based compensation | 36,335 |  |  |  | 36,335 |
Shares issued in connection with acquisition including converted equity awards (in shares) |  | 9,589 |  |  |  |
Shares issued in connection with the AppliedMicro acquisition including converted equity awards | 465,082 | $ 10 |  |  | 465,072 |
Equity issuance costs | (1,019) |  |  |  | (1,019) |
Other comprehensive loss, net of tax | (6,062) |  |  | (6,062) |  |
Net loss | (169,493) |  |  |  |  | (169,493)
Ending Balance (in shares) at Sep. 29, 2017 |  | 64,279 |  |  |  |
Ending balance at Sep. 29, 2017 | 777,374 | $ 64 | $ (330) | 2,977 | 1,041,644 | (266,981)
Ending Balance Treasury stock (in shares) at Sep. 29, 2017 |  |  | (23) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock option exercise (in shares) |  | 27 |  |  |  |
Stock option exercises | 76 |  |  |  | 76 |
Vesting of restricted common stock and units (in shares) |  | 906 |  |  |  |
Vesting of restricted common stock and units | 1 | $ 1 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan (in shares) |  | 306 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 6,881 |  |  |  | 6,881 |
Shares repurchased for tax withholdings on restricted stock awards (in shares) |  | (316) |  |  |  |
Shares repurchased for tax withholdings on restricted stock awards | (6,828) |  |  |  | (6,828) |
Share-based compensation | 31,937 |  |  |  | 31,937 |
Other comprehensive loss, net of tax | (789) |  |  | (789) |  |
Net loss | (139,977) |  |  |  |  | (139,977)
Ending Balance (in shares) at Sep. 28, 2018 |  | 65,202 |  |  |  |
Ending balance at Sep. 28, 2018 | $ 668,675 | $ 65 | $ (330) | 2,188 | 1,074,728 | (407,976)
Ending Balance Treasury stock (in shares) at Sep. 28, 2018 | 23 |  | (23) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 0 |  |  |  | 1,018 | (1,018)
Stock option exercise (in shares) | 119 | 119 |  |  |  |
Stock option exercises | $ 1,608 | $ 0 |  |  | 1,608 |
Vesting of restricted common stock and units (in shares) |  | 673 |  |  |  |
Vesting of restricted common stock and units | 1 | $ 1 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan (in shares) |  | 422 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 5,585 |  |  |  | 5,585 |
Shares repurchased for tax withholdings on restricted stock awards (in shares) |  | (239) |  |  |  |
Shares repurchased for tax withholdings on restricted stock awards | (4,137) | $ 0 |  |  | (4,137) |
Share-based compensation | 23,792 |  |  |  | 23,792 |
Other comprehensive loss, net of tax | 2,170 |  |  | 2,170 |  |
Net loss | (383,798) |  |  |  |  | (383,798)
Ending Balance (in shares) at Sep. 27, 2019 |  | 66,177 |  |  |  |
Ending balance at Sep. 27, 2019 | $ 313,896 | $ 66 | $ (330) | $ 4,358 | $ 1,101,576 | $ (791,774)
Ending Balance Treasury stock (in shares) at Sep. 27, 2019 | 23 |  | (23) |  |  |

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