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Income Taxes - Summary (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Oct. 01, 2017
Income before income taxes: |  |  |
United States | $ 185,535 | $ 180,034 | $ 166,074
Foreign | (10,399) | (5,472) | 5,687
Total income before income taxes | 175,136 | 174,562 | 171,761
Current: |  |  |
Federal | 30,051 | 46,840 | 45,604
State | 8,923 | 9,228 | 8,860
Foreign | 15,016 | 10,897 | 9,337
Total current income tax expense | 53,990 | 66,965 | 63,801
Deferred: |  |  |
Federal | (9,108) | (22,072) | (4,251)
State | (1,195) | (1,471) | (945)
Foreign | (27,312) | (5,817) | (4,761)
Total deferred income tax expense | (37,615) | (29,360) | (9,957)
Total income tax expense | $ 16,375 | $ 37,605 | $ 53,844
Reconciliation of effective income tax rate |  |  |
Tax at federal statutory rate | 21.00% | 24.50% | 35.00%
State taxes, net of federal benefit | 3.40% | 4.20% | 3.40%
Research and Development (R&D) credits | (4.70%) | (1.40%) | (1.80%)
Domestic production deduction | 0.00% | (0.20%) | (0.70%)
Tax differential on foreign earnings | 1.00% | 0.50% | 0.00%
Non-taxable foreign interest income | (1.70%) | (2.00%) | (2.90%)
Goodwill | 0.90% | 1.70% | 0.00%
Stock compensation | (2.40%) | (2.70%) | (2.80%)
Valuation allowance | (13.50%) | (0.50%) | (0.50%)
Change in uncertain tax positions | 2.40% | 1.90% | 1.80%
Revaluation of deferred taxes | (0.014) | (0.084) | 0
Deferred tax adjustments | (0.40%) | 2.10% | 0.00%
Transition tax on foreign earnings | 0.014 | 0 | 0
Other | 3.30% | 1.80% | (0.20%)
Total income tax expense | 9.30% | 21.50% | 31.30%

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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