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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Income Taxes [Line Items]
Reserve related to future rebates and returns	$ 93,500
Valuation allowance amount	252,500	$ 243,100
Valuation allowance change	9,424	(51,329)	$ 140,419
Income (loss) from operations before income taxes	$ (423,153)	$ (155,235)	$ (49,505)
Effective income tax rate	9.30%	13.80%	(203.80%)
Deferred Tax Asset, Intra-entity Transfer, Asset Other than Inventory	$ 39,800
Provisional undistributed accumulated earnings of foreign subsidiary	86,700
Foreign earnings repatriated	156,800
CANADA
Income Taxes [Line Items]
Valuation allowance amount	19,000	$ 13,600
United States
Income Taxes [Line Items]
Valuation allowance change	9,400
Grand Cayman
Income Taxes [Line Items]
Foreign earnings repatriated	59,700
Ireland
Income Taxes [Line Items]
Foreign earnings repatriated	25,600
Federal
Income Taxes [Line Items]
Operating loss carryforwards	923,400
Applied Micro Circuits Corporation | Federal
Income Taxes [Line Items]
Operating loss carryforwards	479,200
Mindspeed Wireless Business | Federal
Income Taxes [Line Items]
Operating loss carryforwards	158,900
BinOptics Corporation | Federal
Income Taxes [Line Items]
Operating loss carryforwards	26,200
MACOM | Federal
Income Taxes [Line Items]
Operating loss carryforwards	$ 259,100

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from intra-entity transfer of asset within consolidated group. Excludes intra-entity transfer of inventory.

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