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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. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Increase (decrease) in tax resulting from:
Income tax (benefit) provision at federal statutory rate	21.00%	21.00%	21.00%
Loss on sale of Cynosure	0.00%	(31.30%)	0.00%
State income taxes, net of federal benefit	2.70%	2.90%	(0.70%)
U.S. tax on foreign earnings	(2.70%)	(2.60%)	(2.10%)
Internal restructuring	0.00%	0.00%	(3.80%)
Tax credits	(0.30%)	(0.60%)	(3.30%)
Tax reform	0	0	0.020
Unrecognized tax benefits	0.30%	0.00%	(0.10%)
Compensation	0.10%	0.40%	0.80%
Foreign rate differential	(0.70%)	(1.20%)	(5.40%)
Change in deferred tax rate	(0.30%)	(0.60%)	0.00%
Change in valuation allowance	0.00%	1.30%	9.50%
Other	0.70%	(0.10%)	3.10%
Effective income tax rate	20.80%	(10.80%)	21.00%

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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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Effective income tax reconciliation loss on sale of Cynosure

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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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 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 restructuring charges.

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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 attributable to the repatriation of foreign earnings.

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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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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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