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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. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Income Tax Disclosure [Abstract]
Income tax provision (benefit) at federal statutory rate	35.00%	35.00%	(35.00%)
Increase (decrease) in tax resulting from:
Goodwill impairment	0.00%	0.00%	32.80%
Domestic production activities deduction	(10.10%)	(30.60%)	(1.20%)
State income taxes, net of federal benefit	1.20%	4.30%	(0.20%)
Tax credits	(3.80%)	(5.20%)	(1.20%)
Unrecognized tax benefits	(1.80%)	2.50%	0.30%
Contingent consideration	0.00%	0.00%	2.60%
Cumulative translation adjustment write-off	1.90%	0.00%	0.00%
Non-deductible compensation	1.90%	5.50%	0.20%
Foreign rate differential	(1.60%)	10.70%	0.10%
Change in valuation allowance	1.00%	35.40%	(0.80%)
Other	2.10%	6.30%	0.70%
Effective income tax rate	25.80%	63.90%	(1.70%)

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Effective income tax rate reconciliation benefit expense research and development.

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The sum of the difference between the effective income tax rate and the domestic federal statutory income tax rate related to the nondeductible portion of contingent consideration related to business combinations.

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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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Represents the impact to the company's effective tax rate for deductions related the discontinuance of the Adiana product line.

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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 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 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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