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Income Taxes - Reconciliation of Income Tax (Benefit) at U.S. Federal Statutory Rate to Company's Effective Tax Rate (Detail) | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
Income tax (benefit) provision at federal statutory rate | (21.00%) | (24.50%) | (35.00%)
Increase (decrease) in tax resulting from: |  |  |
Domestic production activities deduction | 0.00% | 3.10% | (1.70%)
State income taxes, net of federal benefit | (0.70%) | 0.70% | (2.30%)
U.S. tax on foreign earnings | (2.10%) | 0.10% | 0.00%
Internal restructuring | (3.80%) | 0.00% | 0.00%
Non-deductible goodwill | 0.00% | 39.40% | (9.20%)
Tax credits | 3.30% | 1.90% | (0.80%)
Tax reform | (2.00%) | 82.70% | 0.00%
Unrecognized tax benefits | 0.10% | (1.80%) | (1.40%)
Compensation | (0.80%) | (0.30%) | (0.50%)
Foreign rate differential | 5.40% | 5.20% | (2.60%)
Change in deferred tax rate | 0.00% | 1.20% | (0.20%)
Change in valuation allowance | 9.50% | (0.50%) | 1.50%
Other | 3.10% | 1.00% | (0.40%)
Effective income tax rate | (21.00%) | (73.40%) | (38.60%)

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- Definition The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the difference in the deductibility or nondeductibility of executive compensation (i.e., those subject to Section 162(m) limitations), including equity-based compensation and salary and bonus compensation. + References No definition available. + Details
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- Definition The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in unrecognized tax benefits recorded in the statement of operations + References No definition available. + Details
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