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Income Taxes (Tables)
12 Months Ended
Sep. 27, 2019
Income Tax Disclosure [Abstract]  
Components of Deferred Tax Assets and Liabilities The components of our deferred tax assets and liabilities are as follows (in thousands):
 
 
September 27,
2019
 
September 28,
2018
Deferred tax assets (liabilities):
 
 
 
  Federal and foreign net operating losses and credits
$
263,199

 
$
321,982

  Intangible assets
9,887

 
(94,929
)
  Property and equipment
(1,473
)
 
(6,293
)
  Other non-current deferred tax assets
16,933

 
13,850

Deferred compensation

 
3,810

Deferred gain

 
6,575

Interest
7,170

 

  Valuation allowance
(252,536
)
 
(243,112
)
Total deferred tax asset
$
43,180

 
$
1,883


Summary of Domestic and Foreign Income (Loss) from Continuing Operations Before Taxes
The domestic and foreign income (loss) from continuing operations before taxes were as follows (in thousands):
 
 
Fiscal Years
 
2019
 
2018
 
2017
United States
$
(458,617
)
 
$
(145,851
)
 
$
(111,432
)
Foreign
35,464

 
(9,384
)
 
61,927

(Loss) income from operations before income taxes
$
(423,153
)
 
$
(155,235
)
 
$
(49,505
)

Components of Provision (Benefit) for Income Taxes
The components of the (benefit) provision for income taxes are as follows (in thousands):
 
 
Fiscal Years
 
2019
 
2018
 
2017
Current:
 
 
 
 
 
  Federal
$
70

 
$
(6,876
)
 
$
100

  State
36

 
(160
)
 
225

  Foreign
876

 
1,642

 
7,307

           Current provision (benefit)
982

 
(5,394
)
 
7,632

Deferred:
 
 
 
 
 
  Federal
(21,560
)
 
75,428

 
(42,637
)
  State
12,907

 
(15,526
)
 
(4,037
)
  Foreign
(41,108
)
 
(24,652
)
 
(466
)
  Change in valuation allowance
9,424

 
(51,329
)
 
140,419

           Deferred (benefit) provision
(40,337
)
 
(16,079
)
 
93,279

Total (benefit) provision
$
(39,355
)
 
$
(21,473
)
 
$
100,911


Reconciliation of Effective Tax Rates
Our effective tax rates differ from the federal and statutory rate as follows:
 
 
Fiscal Years
 
2019
 
2018
 
2017
Federal statutory rate
21.0%
 
24.5%
 
35.0%
Foreign rate differential
1.6
 
5.1
 
31.9
State taxes net of federal benefit
0.9
 
0.8
 
0.2
Warrant liabilities
 
4.4
 
(1.8)
Change in valuation allowance
(2.4)
 
34.0
 
(270.0)
Research and development credits
1.4
 
9.0
 
12.8
Provision to return adjustments
0.3
 
8.3
 
(4.0)
Section 382 adjustment
(19.3)
 
 
Nondeductible compensation expense
(0.6)
 
1.4
 
(4.1)
Global Intangible Low Taxed Income
(2.9)
 
 
Nondeductible legal fees
 
0.9
 
(3.9)
2017 tax reform
 
(73.7)
 
Intra-entity license transfer
9.4
 
 
Other permanent differences
(0.1)
 
(0.9)
 
0.1
Effective income tax rate
9.3%
 
13.8%
 
(203.8)%

Activity Related to Unrecognized Tax Benefits
Activity related to unrecognized tax benefits is as follows (in thousands):
 
Amount
Balance - September 29, 2017
(1,670
)
  Additions based on tax positions

  Reductions based on tax positions
1,370

Balance - September 28, 2018
$
(300
)
  Additions based on tax positions

  Reductions based on tax positions

Balance at September 27, 2019
$
(300
)

Summary of Fiscal Tax Years Examination by Jurisdictions
A summary of the fiscal tax years that remain subject to examination, as of September 27, 2019, for the Company’s significant tax jurisdictions are:
Jurisdiction
Tax Years Subject to Examination
United States—federal
2015 - forward
United States—various states
2015 - forward
Ireland
2016 - forward