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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
	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Income Tax Disclosure [Abstract]
Income tax (benefit) provision at federal statutory rate	24.50%	35.00%	35.00%
Increase (decrease) in tax resulting from:
Domestic production activities deduction	3.10%	(1.70%)	(5.00%)
State income taxes, net of federal benefit	(0.70%)	2.30%	2.00%
Non-deductible goodwill	(39.40%)	9.20%	0.00%
Tax credits	1.90%	(0.80%)	(3.20%)
Tax reform	82.70%	0.00%	0.00%
Unrecognized tax benefits	(1.80%)	(1.40%)	2.40%
Compensation	(0.30%)	(0.50%)	0.10%
Foreign rate differential	5.20%	(2.60%)	(6.10%)
Change in deferred tax rate	(1.20%)	0.20%	(1.80%)
Change in valuation allowance	0.50%	(1.50%)	(3.40%)
Other	(1.10%)	0.40%	0.30%
Effective income tax rate	73.40%	38.60%	20.30%

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Effective income tax rate reconciliation benefit expense research and development.

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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.

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Effective income tax rate reconciliation non deductible expenses.

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Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act Of 2017, Percent

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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

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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 changes in the valuation allowance for deferred tax assets.

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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 changes in the income tax rates.

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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 deduction for qualified production activity.

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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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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 other adjustments.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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