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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. 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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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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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 other adjustments.

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